Rollup merge of #134228 - oli-obk:pat-lit-path, r=compiler-errors

Exhaustively handle expressions in patterns

We currently have this invariant in HIR that a `PatKind::Lit` or a `PatKind::Range` only contains

* `ExprKind::Lit`
* `ExprKind::UnOp(Neg, ExprKind::Lit)`
* `ExprKind::Path`
* `ExprKind::ConstBlock`

So I made `PatKind::Lit` and `PatKind::Range` stop containing `Expr`, and instead created a `PatLit` type whose `kind` enum only contains those variants.

The only place code got more complicated was in clippy, as it couldn't share as much anymore with `Expr` handling

It may be interesting on merging `ExprKind::{Path,Lit,ConstBlock}` in the future and using the same `PatLit` type (under a new name).

Then it should also be easier to eliminate any and all `UnOp(Neg, Lit) | Lit` matching that we have across the compiler. Some day we should fold the negation into the literal itself and just store it on the numeric literals

compiler/rustc_ast/src/ast.rs

@@ -623,7 +623,7 @@ impl Pat {
             PatKind::Wild
             | PatKind::Rest
             | PatKind::Never
-            | PatKind::Lit(_)
+            | PatKind::Expr(_)
             | PatKind::Range(..)
             | PatKind::Ident(..)
             | PatKind::Path(..)
@@ -801,8 +801,8 @@ pub enum PatKind {
     /// A reference pattern (e.g., `&mut (a, b)`).
     Ref(P<Pat>, Mutability),
 
-    /// A literal.
+    /// A literal, const block or path.
-    Lit(P<Expr>),
+    Expr(P<Expr>),
 
     /// A range pattern (e.g., `1...2`, `1..2`, `1..`, `..2`, `1..=2`, `..=2`).
     Range(Option<P<Expr>>, Option<P<Expr>>, Spanned<RangeEnd>),

compiler/rustc_ast/src/mut_visit.rs

@@ -1512,7 +1512,7 @@ pub fn walk_pat<T: MutVisitor>(vis: &mut T, pat: &mut P<Pat>) {
             vis.visit_ident(ident);
             visit_opt(sub, |sub| vis.visit_pat(sub));
         }
-        PatKind::Lit(e) => vis.visit_expr(e),
+        PatKind::Expr(e) => vis.visit_expr(e),
         PatKind::TupleStruct(qself, path, elems) => {
             vis.visit_qself(qself);
             vis.visit_path(path);

compiler/rustc_ast/src/visit.rs

@@ -680,7 +680,7 @@ pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) -> V::Res
             try_visit!(visitor.visit_ident(ident));
             visit_opt!(visitor, visit_pat, optional_subpattern);
         }
-        PatKind::Lit(expression) => try_visit!(visitor.visit_expr(expression)),
+        PatKind::Expr(expression) => try_visit!(visitor.visit_expr(expression)),
         PatKind::Range(lower_bound, upper_bound, _end) => {
             visit_opt!(visitor, visit_expr, lower_bound);
             visit_opt!(visitor, visit_expr, upper_bound);

compiler/rustc_ast_lowering/src/expr.rs

@@ -102,17 +102,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
 
             let kind = match &e.kind {
                 ExprKind::Array(exprs) => hir::ExprKind::Array(self.lower_exprs(exprs)),
-                ExprKind::ConstBlock(c) => {
+                ExprKind::ConstBlock(c) => hir::ExprKind::ConstBlock(self.lower_const_block(c)),
-                    let c = self.with_new_scopes(c.value.span, |this| {
-                        let def_id = this.local_def_id(c.id);
-                        hir::ConstBlock {
-                            def_id,
-                            hir_id: this.lower_node_id(c.id),
-                            body: this.lower_const_body(c.value.span, Some(&c.value)),
-                        }
-                    });
-                    hir::ExprKind::ConstBlock(c)
-                }
                 ExprKind::Repeat(expr, count) => {
                     let expr = self.lower_expr(expr);
                     let count = self.lower_array_length_to_const_arg(count);
@@ -153,18 +143,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
                     let ohs = self.lower_expr(ohs);
                     hir::ExprKind::Unary(op, ohs)
                 }
-                ExprKind::Lit(token_lit) => {
+                ExprKind::Lit(token_lit) => hir::ExprKind::Lit(self.lower_lit(token_lit, e.span)),
-                    let lit_kind = match LitKind::from_token_lit(*token_lit) {
-                        Ok(lit_kind) => lit_kind,
-                        Err(err) => {
-                            let guar =
-                                report_lit_error(&self.tcx.sess.psess, err, *token_lit, e.span);
-                            LitKind::Err(guar)
-                        }
-                    };
-                    let lit = self.arena.alloc(respan(self.lower_span(e.span), lit_kind));
-                    hir::ExprKind::Lit(lit)
-                }
                 ExprKind::IncludedBytes(bytes) => {
                     let lit = self.arena.alloc(respan(
                         self.lower_span(e.span),
@@ -403,6 +382,32 @@ impl<'hir> LoweringContext<'_, 'hir> {
         })
     }
 
+    pub(crate) fn lower_const_block(&mut self, c: &AnonConst) -> hir::ConstBlock {
+        self.with_new_scopes(c.value.span, |this| {
+            let def_id = this.local_def_id(c.id);
+            hir::ConstBlock {
+                def_id,
+                hir_id: this.lower_node_id(c.id),
+                body: this.lower_const_body(c.value.span, Some(&c.value)),
+            }
+        })
+    }
+
+    pub(crate) fn lower_lit(
+        &mut self,
+        token_lit: &token::Lit,
+        span: Span,
+    ) -> &'hir Spanned<LitKind> {
+        let lit_kind = match LitKind::from_token_lit(*token_lit) {
+            Ok(lit_kind) => lit_kind,
+            Err(err) => {
+                let guar = report_lit_error(&self.tcx.sess.psess, err, *token_lit, span);
+                LitKind::Err(guar)
+            }
+        };
+        self.arena.alloc(respan(self.lower_span(span), lit_kind))
+    }
+
     fn lower_unop(&mut self, u: UnOp) -> hir::UnOp {
         match u {
             UnOp::Deref => hir::UnOp::Deref,

compiler/rustc_ast_lowering/src/index.rs

@@ -209,6 +209,14 @@ impl<'a, 'hir> Visitor<'hir> for NodeCollector<'a, 'hir> {
         });
     }
 
+    fn visit_pat_expr(&mut self, expr: &'hir PatExpr<'hir>) {
+        self.insert(expr.span, expr.hir_id, Node::PatExpr(expr));
+
+        self.with_parent(expr.hir_id, |this| {
+            intravisit::walk_pat_expr(this, expr);
+        });
+    }
+
     fn visit_pat_field(&mut self, field: &'hir PatField<'hir>) {
         self.insert(field.span, field.hir_id, Node::PatField(field));
         self.with_parent(field.hir_id, |this| {

compiler/rustc_ast_lowering/src/lib.rs

@@ -35,6 +35,7 @@
 #![doc(rust_logo)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
+#![feature(if_let_guard)]
 #![feature(let_chains)]
 #![feature(rustdoc_internals)]
 #![warn(unreachable_pub)]

compiler/rustc_ast_lowering/src/pat.rs

@@ -1,9 +1,12 @@
+use std::sync::Arc;
+
 use rustc_ast::ptr::P;
 use rustc_ast::*;
 use rustc_data_structures::stack::ensure_sufficient_stack;
 use rustc_hir as hir;
 use rustc_hir::def::Res;
-use rustc_span::source_map::Spanned;
+use rustc_middle::span_bug;
+use rustc_span::source_map::{Spanned, respan};
 use rustc_span::{Ident, Span};
 
 use super::errors::{
@@ -35,8 +38,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             lower_sub,
                         );
                     }
-                    PatKind::Lit(e) => {
+                    PatKind::Expr(e) => {
-                        break hir::PatKind::Lit(self.lower_expr_within_pat(e, false));
+                        break hir::PatKind::Expr(self.lower_expr_within_pat(e, false));
                     }
                     PatKind::TupleStruct(qself, path, pats) => {
                         let qpath = self.lower_qpath(
@@ -367,24 +370,54 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
     // }
     // m!(S);
     // ```
-    fn lower_expr_within_pat(&mut self, expr: &Expr, allow_paths: bool) -> &'hir hir::Expr<'hir> {
+    fn lower_expr_within_pat(
-        match &expr.kind {
+        &mut self,
-            ExprKind::Lit(..)
+        expr: &Expr,
-            | ExprKind::ConstBlock(..)
+        allow_paths: bool,
-            | ExprKind::IncludedBytes(..)
+    ) -> &'hir hir::PatExpr<'hir> {
-            | ExprKind::Err(_)
+        let err = |guar| hir::PatExprKind::Lit {
-            | ExprKind::Dummy => {}
+            lit: self.arena.alloc(respan(self.lower_span(expr.span), LitKind::Err(guar))),
-            ExprKind::Path(..) if allow_paths => {}
+            negated: false,
-            ExprKind::Unary(UnOp::Neg, inner) if matches!(inner.kind, ExprKind::Lit(_)) => {}
+        };
+        let kind = match &expr.kind {
+            ExprKind::Lit(lit) => {
+                hir::PatExprKind::Lit { lit: self.lower_lit(lit, expr.span), negated: false }
+            }
+            ExprKind::ConstBlock(c) => hir::PatExprKind::ConstBlock(self.lower_const_block(c)),
+            ExprKind::IncludedBytes(bytes) => hir::PatExprKind::Lit {
+                lit: self.arena.alloc(respan(
+                    self.lower_span(expr.span),
+                    LitKind::ByteStr(Arc::clone(bytes), StrStyle::Cooked),
+                )),
+                negated: false,
+            },
+            ExprKind::Err(guar) => err(*guar),
+            ExprKind::Dummy => span_bug!(expr.span, "lowered ExprKind::Dummy"),
+            ExprKind::Path(qself, path) if allow_paths => hir::PatExprKind::Path(self.lower_qpath(
+                expr.id,
+                qself,
+                path,
+                ParamMode::Optional,
+                AllowReturnTypeNotation::No,
+                ImplTraitContext::Disallowed(ImplTraitPosition::Path),
+                None,
+            )),
+            ExprKind::Unary(UnOp::Neg, inner) if let ExprKind::Lit(lit) = &inner.kind => {
+                hir::PatExprKind::Lit { lit: self.lower_lit(lit, expr.span), negated: true }
+            }
             _ => {
                 let pattern_from_macro = expr.is_approximately_pattern();
                 let guar = self.dcx().emit_err(ArbitraryExpressionInPattern {
                     span: expr.span,
                     pattern_from_macro_note: pattern_from_macro,
                 });
-                return self.arena.alloc(self.expr_err(expr.span, guar));
+                err(guar)
             }
-        }
+        };
-        self.lower_expr(expr)
+        self.arena.alloc(hir::PatExpr {
+            hir_id: self.lower_node_id(expr.id),
+            span: expr.span,
+            kind,
+        })
     }
 }

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -1701,7 +1701,7 @@ impl<'a> State<'a> {
                     self.print_pat(inner);
                 }
             }
-            PatKind::Lit(e) => self.print_expr(e, FixupContext::default()),
+            PatKind::Expr(e) => self.print_expr(e, FixupContext::default()),
             PatKind::Range(begin, end, Spanned { node: end_kind, .. }) => {
                 if let Some(e) = begin {
                     self.print_expr(e, FixupContext::default());

compiler/rustc_expand/src/base.rs

@@ -522,7 +522,7 @@ impl MacResult for MacEager {
                 return Some(P(ast::Pat {
                     id: ast::DUMMY_NODE_ID,
                     span: e.span,
-                    kind: PatKind::Lit(e),
+                    kind: PatKind::Expr(e),
                     tokens: None,
                 }));
             }

compiler/rustc_expand/src/build.rs

@@ -486,7 +486,7 @@ impl<'a> ExtCtxt<'a> {
         self.pat(span, PatKind::Wild)
     }
     pub fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat> {
-        self.pat(span, PatKind::Lit(expr))
+        self.pat(span, PatKind::Expr(expr))
     }
     pub fn pat_ident(&self, span: Span, ident: Ident) -> P<ast::Pat> {
         self.pat_ident_binding_mode(span, ident, ast::BindingMode::NONE)

compiler/rustc_hir/src/hir.rs

@@ -1386,7 +1386,7 @@ impl<'hir> Pat<'hir> {
 
         use PatKind::*;
         match self.kind {
-            Wild | Never | Lit(_) | Range(..) | Binding(.., None) | Path(_) | Err(_) => true,
+            Wild | Never | Expr(_) | Range(..) | Binding(.., None) | Path(_) | Err(_) => true,
             Box(s) | Deref(s) | Ref(s, _) | Binding(.., Some(s)) | Guard(s, _) => s.walk_short_(it),
             Struct(_, fields, _) => fields.iter().all(|field| field.pat.walk_short_(it)),
             TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().all(|p| p.walk_short_(it)),
@@ -1413,7 +1413,7 @@ impl<'hir> Pat<'hir> {
 
         use PatKind::*;
         match self.kind {
-            Wild | Never | Lit(_) | Range(..) | Binding(.., None) | Path(_) | Err(_) => {}
+            Wild | Never | Expr(_) | Range(..) | Binding(.., None) | Path(_) | Err(_) => {}
             Box(s) | Deref(s) | Ref(s, _) | Binding(.., Some(s)) | Guard(s, _) => s.walk_(it),
             Struct(_, fields, _) => fields.iter().for_each(|field| field.pat.walk_(it)),
             TupleStruct(_, s, _) | Tuple(s, _) | Or(s) => s.iter().for_each(|p| p.walk_(it)),
@@ -1519,6 +1519,26 @@ impl fmt::Debug for DotDotPos {
     }
 }
 
+#[derive(Debug, Clone, Copy, HashStable_Generic)]
+pub struct PatExpr<'hir> {
+    pub hir_id: HirId,
+    pub span: Span,
+    pub kind: PatExprKind<'hir>,
+}
+
+#[derive(Debug, Clone, Copy, HashStable_Generic)]
+pub enum PatExprKind<'hir> {
+    Lit {
+        lit: &'hir Lit,
+        // FIXME: move this into `Lit` and handle negated literal expressions
+        // once instead of matching on unop neg expressions everywhere.
+        negated: bool,
+    },
+    ConstBlock(ConstBlock),
+    /// A path pattern for a unit struct/variant or a (maybe-associated) constant.
+    Path(QPath<'hir>),
+}
+
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub enum PatKind<'hir> {
     /// Represents a wildcard pattern (i.e., `_`).
@@ -1563,14 +1583,14 @@ pub enum PatKind<'hir> {
     /// A reference pattern (e.g., `&mut (a, b)`).
     Ref(&'hir Pat<'hir>, Mutability),
 
-    /// A literal.
+    /// A literal, const block or path.
-    Lit(&'hir Expr<'hir>),
+    Expr(&'hir PatExpr<'hir>),
 
     /// A guard pattern (e.g., `x if guard(x)`).
     Guard(&'hir Pat<'hir>, &'hir Expr<'hir>),
 
     /// A range pattern (e.g., `1..=2` or `1..2`).
-    Range(Option<&'hir Expr<'hir>>, Option<&'hir Expr<'hir>>, RangeEnd),
+    Range(Option<&'hir PatExpr<'hir>>, Option<&'hir PatExpr<'hir>>, RangeEnd),
 
     /// A slice pattern, `[before_0, ..., before_n, (slice, after_0, ..., after_n)?]`.
     ///
@@ -4144,6 +4164,10 @@ pub enum Node<'hir> {
     OpaqueTy(&'hir OpaqueTy<'hir>),
     Pat(&'hir Pat<'hir>),
     PatField(&'hir PatField<'hir>),
+    /// Needed as its own node with its own HirId for tracking
+    /// the unadjusted type of literals within patterns
+    /// (e.g. byte str literals not being of slice type).
+    PatExpr(&'hir PatExpr<'hir>),
     Arm(&'hir Arm<'hir>),
     Block(&'hir Block<'hir>),
     LetStmt(&'hir LetStmt<'hir>),
@@ -4200,6 +4224,7 @@ impl<'hir> Node<'hir> {
             | Node::Block(..)
             | Node::Ctor(..)
             | Node::Pat(..)
+            | Node::PatExpr(..)
             | Node::Arm(..)
             | Node::LetStmt(..)
             | Node::Crate(..)

compiler/rustc_hir/src/intravisit.rs

@@ -342,6 +342,9 @@ pub trait Visitor<'v>: Sized {
     fn visit_pat_field(&mut self, f: &'v PatField<'v>) -> Self::Result {
         walk_pat_field(self, f)
     }
+    fn visit_pat_expr(&mut self, expr: &'v PatExpr<'v>) -> Self::Result {
+        walk_pat_expr(self, expr)
+    }
     fn visit_anon_const(&mut self, c: &'v AnonConst) -> Self::Result {
         walk_anon_const(self, c)
     }
@@ -685,10 +688,10 @@ pub fn walk_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v Pat<'v>) -> V:
             try_visit!(visitor.visit_ident(ident));
             visit_opt!(visitor, visit_pat, optional_subpattern);
         }
-        PatKind::Lit(ref expression) => try_visit!(visitor.visit_expr(expression)),
+        PatKind::Expr(ref expression) => try_visit!(visitor.visit_pat_expr(expression)),
         PatKind::Range(ref lower_bound, ref upper_bound, _) => {
-            visit_opt!(visitor, visit_expr, lower_bound);
+            visit_opt!(visitor, visit_pat_expr, lower_bound);
-            visit_opt!(visitor, visit_expr, upper_bound);
+            visit_opt!(visitor, visit_pat_expr, upper_bound);
         }
         PatKind::Never | PatKind::Wild | PatKind::Err(_) => (),
         PatKind::Slice(prepatterns, ref slice_pattern, postpatterns) => {
@@ -710,6 +713,15 @@ pub fn walk_pat_field<'v, V: Visitor<'v>>(visitor: &mut V, field: &'v PatField<'
     visitor.visit_pat(field.pat)
 }
 
+pub fn walk_pat_expr<'v, V: Visitor<'v>>(visitor: &mut V, expr: &'v PatExpr<'v>) -> V::Result {
+    try_visit!(visitor.visit_id(expr.hir_id));
+    match &expr.kind {
+        PatExprKind::Lit { .. } => V::Result::output(),
+        PatExprKind::ConstBlock(c) => visitor.visit_inline_const(c),
+        PatExprKind::Path(qpath) => visitor.visit_qpath(qpath, expr.hir_id, expr.span),
+    }
+}
+
 pub fn walk_anon_const<'v, V: Visitor<'v>>(visitor: &mut V, constant: &'v AnonConst) -> V::Result {
     try_visit!(visitor.visit_id(constant.hir_id));
     visitor.visit_nested_body(constant.body)

compiler/rustc_hir_analysis/src/check/region.rs

@@ -704,7 +704,7 @@ fn resolve_local<'tcx>(
             | PatKind::Wild
             | PatKind::Never
             | PatKind::Path(_)
-            | PatKind::Lit(_)
+            | PatKind::Expr(_)
             | PatKind::Range(_, _, _)
             | PatKind::Err(_) => false,
         }

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -2449,17 +2449,11 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                         Ty::new_error(tcx, err)
                     }
                     hir::PatKind::Range(start, end, include_end) => {
-                        let expr_to_const = |expr: &'tcx hir::Expr<'tcx>| -> ty::Const<'tcx> {
+                        let expr_to_const = |expr: &'tcx hir::PatExpr<'tcx>| -> ty::Const<'tcx> {
-                            let (expr, neg) = match expr.kind {
+                            let (c, c_ty) = match expr.kind {
-                                hir::ExprKind::Unary(hir::UnOp::Neg, negated) => {
+                                hir::PatExprKind::Lit { lit, negated } => {
-                                    (negated, Some((expr.hir_id, expr.span)))
-                                }
-                                _ => (expr, None),
-                            };
-                            let (c, c_ty) = match &expr.kind {
-                                hir::ExprKind::Lit(lit) => {
                                     let lit_input =
-                                        LitToConstInput { lit: &lit.node, ty, neg: neg.is_some() };
+                                        LitToConstInput { lit: &lit.node, ty, neg: negated };
                                     let ct = match tcx.lit_to_const(lit_input) {
                                         Ok(c) => c,
                                         Err(LitToConstError::Reported(err)) => {
@@ -2470,23 +2464,30 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                                     (ct, ty)
                                 }
 
-                                hir::ExprKind::Path(hir::QPath::Resolved(
+                                hir::PatExprKind::Path(hir::QPath::Resolved(
                                     _,
                                     path @ &hir::Path {
                                         res: Res::Def(DefKind::ConstParam, def_id),
                                         ..
                                     },
                                 )) => {
-                                    let _ = self.prohibit_generic_args(
+                                    match self.prohibit_generic_args(
                                         path.segments.iter(),
                                         GenericsArgsErrExtend::Param(def_id),
-                                    );
+                                    ) {
-                                    let ty = tcx
+                                        Ok(()) => {
-                                        .type_of(def_id)
+                                            let ty = tcx
-                                        .no_bound_vars()
+                                                .type_of(def_id)
-                                        .expect("const parameter types cannot be generic");
+                                                .no_bound_vars()
-                                    let ct = self.lower_const_param(def_id, expr.hir_id);
+                                                .expect("const parameter types cannot be generic");
-                                    (ct, ty)
+                                            let ct = self.lower_const_param(def_id, expr.hir_id);
+                                            (ct, ty)
+                                        }
+                                        Err(guar) => (
+                                            ty::Const::new_error(tcx, guar),
+                                            Ty::new_error(tcx, guar),
+                                        ),
+                                    }
                                 }
 
                                 _ => {
@@ -2497,9 +2498,6 @@ impl<'tcx> dyn HirTyLowerer<'tcx> + '_ {
                                 }
                             };
                             self.record_ty(expr.hir_id, c_ty, expr.span);
-                            if let Some((id, span)) = neg {
-                                self.record_ty(id, c_ty, span);
-                            }
                             c
                         };
 

compiler/rustc_hir_pretty/src/lib.rs

@@ -199,6 +199,7 @@ impl<'a> State<'a> {
             Node::OpaqueTy(o) => self.print_opaque_ty(o),
             Node::Pat(a) => self.print_pat(a),
             Node::PatField(a) => self.print_patfield(a),
+            Node::PatExpr(a) => self.print_pat_expr(a),
             Node::Arm(a) => self.print_arm(a),
             Node::Infer(_) => self.word("_"),
             Node::PreciseCapturingNonLifetimeArg(param) => self.print_ident(param.ident),
@@ -1849,6 +1850,19 @@ impl<'a> State<'a> {
         }
     }
 
+    fn print_pat_expr(&mut self, expr: &hir::PatExpr<'_>) {
+        match &expr.kind {
+            hir::PatExprKind::Lit { lit, negated } => {
+                if *negated {
+                    self.word("-");
+                }
+                self.print_literal(lit);
+            }
+            hir::PatExprKind::ConstBlock(c) => self.print_inline_const(c),
+            hir::PatExprKind::Path(qpath) => self.print_qpath(qpath, true),
+        }
+    }
+
     fn print_pat(&mut self, pat: &hir::Pat<'_>) {
         self.maybe_print_comment(pat.span.lo());
         self.ann.pre(self, AnnNode::Pat(pat));
@@ -1966,17 +1980,17 @@ impl<'a> State<'a> {
                     self.pclose();
                 }
             }
-            PatKind::Lit(e) => self.print_expr(e),
+            PatKind::Expr(e) => self.print_pat_expr(e),
             PatKind::Range(begin, end, end_kind) => {
                 if let Some(expr) = begin {
-                    self.print_expr(expr);
+                    self.print_pat_expr(expr);
                 }
                 match end_kind {
                     RangeEnd::Included => self.word("..."),
                     RangeEnd::Excluded => self.word(".."),
                 }
                 if let Some(expr) = end {
-                    self.print_expr(expr);
+                    self.print_pat_expr(expr);
                 }
             }
             PatKind::Slice(before, slice, after) => {

compiler/rustc_hir_typeck/src/expr.rs

@@ -430,6 +430,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             | hir::Node::AssocItemConstraint(_)
             | hir::Node::TraitRef(_)
             | hir::Node::PatField(_)
+            | hir::Node::PatExpr(_)
             | hir::Node::LetStmt(_)
             | hir::Node::Synthetic
             | hir::Node::Err(_)
@@ -484,7 +485,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             | hir::PatKind::Box(_)
             | hir::PatKind::Ref(_, _)
             | hir::PatKind::Deref(_)
-            | hir::PatKind::Lit(_)
+            | hir::PatKind::Expr(_)
             | hir::PatKind::Range(_, _, _)
             | hir::PatKind::Slice(_, _, _)
             | hir::PatKind::Err(_) => true,
@@ -837,7 +838,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // We always require that the type provided as the value for
         // a type parameter outlives the moment of instantiation.
         let args = self.typeck_results.borrow().node_args(expr.hir_id);
-        self.add_wf_bounds(args, expr);
+        self.add_wf_bounds(args, expr.span);
 
         ty
     }
@@ -1796,7 +1797,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    fn check_expr_const_block(
+    pub(super) fn check_expr_const_block(
         &self,
         block: &'tcx hir::ConstBlock,
         expected: Expectation<'tcx>,

compiler/rustc_hir_typeck/src/expr_use_visitor.rs

@@ -595,7 +595,7 @@ impl<'tcx, Cx: TypeInformationCtxt<'tcx>, D: Delegate<'tcx>> ExprUseVisitor<'tcx
                         let place_ty = place.place.ty();
                         needs_to_be_read |= self.is_multivariant_adt(place_ty, pat.span);
                     }
-                    PatKind::Lit(_) | PatKind::Range(..) => {
+                    PatKind::Expr(_) | PatKind::Range(..) => {
                         // If the PatKind is a Lit or a Range then we want
                         // to borrow discr.
                         needs_to_be_read = true;
@@ -1803,7 +1803,7 @@ impl<'tcx, Cx: TypeInformationCtxt<'tcx>, D: Delegate<'tcx>> ExprUseVisitor<'tcx
 
             PatKind::Path(_)
             | PatKind::Binding(.., None)
-            | PatKind::Lit(..)
+            | PatKind::Expr(..)
             | PatKind::Range(..)
             | PatKind::Never
             | PatKind::Wild

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -577,11 +577,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     }
 
     /// Registers obligations that all `args` are well-formed.
-    pub(crate) fn add_wf_bounds(&self, args: GenericArgsRef<'tcx>, expr: &hir::Expr<'_>) {
+    pub(crate) fn add_wf_bounds(&self, args: GenericArgsRef<'tcx>, span: Span) {
         for arg in args.iter().filter(|arg| {
             matches!(arg.unpack(), GenericArgKind::Type(..) | GenericArgKind::Const(..))
         }) {
-            self.register_wf_obligation(arg, expr.span, ObligationCauseCode::WellFormed(None));
+            self.register_wf_obligation(arg, span, ObligationCauseCode::WellFormed(None));
         }
     }
 
@@ -1039,6 +1039,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 def_id,
                 span,
             ),
+            Res::Err => {
+                return (
+                    Ty::new_error(
+                        tcx,
+                        tcx.dcx().span_delayed_bug(span, "could not resolve path {:?}"),
+                    ),
+                    res,
+                );
+            }
             _ => bug!("instantiate_value_path on {:?}", res),
         };
 

compiler/rustc_hir_typeck/src/method/confirm.rs

@@ -611,7 +611,7 @@ impl<'a, 'tcx> ConfirmContext<'a, 'tcx> {
 
         // this is a projection from a trait reference, so we have to
         // make sure that the trait reference inputs are well-formed.
-        self.add_wf_bounds(all_args, self.call_expr);
+        self.add_wf_bounds(all_args, self.call_expr.span);
 
         // the function type must also be well-formed (this is not
         // implied by the args being well-formed because of inherent

compiler/rustc_hir_typeck/src/method/suggest.rs

@@ -170,6 +170,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 span,
                 ..
             })
+            | hir::Node::PatExpr(&hir::PatExpr {
+                kind: hir::PatExprKind::Path(QPath::TypeRelative(rcvr, segment)),
+                span,
+                ..
+            })
             | hir::Node::Pat(&hir::Pat {
                 kind:
                     hir::PatKind::Path(QPath::TypeRelative(rcvr, segment))

compiler/rustc_hir_typeck/src/pat.rs

@@ -30,6 +30,7 @@ use tracing::{debug, instrument, trace};
 use ty::VariantDef;
 
 use super::report_unexpected_variant_res;
+use crate::expectation::Expectation;
 use crate::gather_locals::DeclOrigin;
 use crate::{FnCtxt, LoweredTy, errors};
 
@@ -270,7 +271,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             PatKind::Wild | PatKind::Err(_) => expected,
             // We allow any type here; we ensure that the type is uninhabited during match checking.
             PatKind::Never => expected,
-            PatKind::Lit(lt) => self.check_pat_lit(pat.span, lt, expected, ti),
+            PatKind::Expr(lt) => self.check_pat_lit(pat.span, lt, expected, ti),
             PatKind::Range(lhs, rhs, _) => self.check_pat_range(pat.span, lhs, rhs, expected, ti),
             PatKind::Binding(ba, var_id, ident, sub) => {
                 self.check_pat_ident(pat, ba, var_id, ident, sub, expected, pat_info)
@@ -279,7 +280,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 self.check_pat_tuple_struct(pat, qpath, subpats, ddpos, expected, pat_info)
             }
             PatKind::Path(ref qpath) => {
-                self.check_pat_path(pat, qpath, path_res.unwrap(), expected, ti)
+                self.check_pat_path(pat.hir_id, pat.span, qpath, path_res.unwrap(), expected, ti)
             }
             PatKind::Struct(ref qpath, fields, has_rest_pat) => {
                 self.check_pat_struct(pat, qpath, fields, has_rest_pat, expected, pat_info)
@@ -398,7 +399,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             // As a result, we allow `if let 0 = &&0 {}` but not `if let "foo" = &&"foo" {}`.
             //
             // Call `resolve_vars_if_possible` here for inline const blocks.
-            PatKind::Lit(lt) => match self.resolve_vars_if_possible(self.check_expr(lt)).kind() {
+            PatKind::Expr(lt) => match self.resolve_vars_if_possible(self.check_pat_expr_unadjusted(lt)).kind() {
                 ty::Ref(..) => AdjustMode::Pass,
                 _ => AdjustMode::Peel,
             },
@@ -493,10 +494,28 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         (expected, def_br, max_ref_mutbl)
     }
 
+    fn check_pat_expr_unadjusted(&self, lt: &'tcx hir::PatExpr<'tcx>) -> Ty<'tcx> {
+        let ty = match &lt.kind {
+            rustc_hir::PatExprKind::Lit { lit, .. } => {
+                self.check_expr_lit(lit, Expectation::NoExpectation)
+            }
+            rustc_hir::PatExprKind::ConstBlock(c) => {
+                self.check_expr_const_block(c, Expectation::NoExpectation)
+            }
+            rustc_hir::PatExprKind::Path(qpath) => {
+                let (res, opt_ty, segments) =
+                    self.resolve_ty_and_res_fully_qualified_call(qpath, lt.hir_id, lt.span);
+                self.instantiate_value_path(segments, opt_ty, res, lt.span, lt.span, lt.hir_id).0
+            }
+        };
+        self.write_ty(lt.hir_id, ty);
+        ty
+    }
+
     fn check_pat_lit(
         &self,
         span: Span,
-        lt: &hir::Expr<'tcx>,
+        lt: &hir::PatExpr<'tcx>,
         expected: Ty<'tcx>,
         ti: &TopInfo<'tcx>,
     ) -> Ty<'tcx> {
@@ -507,7 +526,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // Byte string patterns behave the same way as array patterns
         // They can denote both statically and dynamically-sized byte arrays.
         let mut pat_ty = ty;
-        if let hir::ExprKind::Lit(Spanned { node: ast::LitKind::ByteStr(..), .. }) = lt.kind {
+        if let hir::PatExprKind::Lit {
+            lit: Spanned { node: ast::LitKind::ByteStr(..), .. }, ..
+        } = lt.kind
+        {
             let expected = self.structurally_resolve_type(span, expected);
             if let ty::Ref(_, inner_ty, _) = *expected.kind()
                 && self.try_structurally_resolve_type(span, inner_ty).is_slice()
@@ -524,7 +546,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
 
         if self.tcx.features().string_deref_patterns()
-            && let hir::ExprKind::Lit(Spanned { node: ast::LitKind::Str(..), .. }) = lt.kind
+            && let hir::PatExprKind::Lit {
+                lit: Spanned { node: ast::LitKind::Str(..), .. }, ..
+            } = lt.kind
         {
             let tcx = self.tcx;
             let expected = self.resolve_vars_if_possible(expected);
@@ -565,15 +589,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     fn check_pat_range(
         &self,
         span: Span,
-        lhs: Option<&'tcx hir::Expr<'tcx>>,
+        lhs: Option<&'tcx hir::PatExpr<'tcx>>,
-        rhs: Option<&'tcx hir::Expr<'tcx>>,
+        rhs: Option<&'tcx hir::PatExpr<'tcx>>,
         expected: Ty<'tcx>,
         ti: &TopInfo<'tcx>,
     ) -> Ty<'tcx> {
-        let calc_side = |opt_expr: Option<&'tcx hir::Expr<'tcx>>| match opt_expr {
+        let calc_side = |opt_expr: Option<&'tcx hir::PatExpr<'tcx>>| match opt_expr {
             None => None,
             Some(expr) => {
-                let ty = self.check_expr(expr);
+                let ty = self.check_pat_expr_unadjusted(expr);
                 // Check that the end-point is possibly of numeric or char type.
                 // The early check here is not for correctness, but rather better
                 // diagnostics (e.g. when `&str` is being matched, `expected` will
@@ -919,7 +943,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         | PatKind::Box(..)
                         | PatKind::Deref(_)
                         | PatKind::Ref(..)
-                        | PatKind::Lit(..)
+                        | PatKind::Expr(..)
                         | PatKind::Range(..)
                         | PatKind::Err(_) => break 'block None,
                     },
@@ -1053,7 +1077,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
     fn check_pat_path(
         &self,
-        pat: &Pat<'tcx>,
+        hir_id: HirId,
+        span: Span,
         qpath: &hir::QPath<'_>,
         path_resolution: (Res, Option<LoweredTy<'tcx>>, &'tcx [hir::PathSegment<'tcx>]),
         expected: Ty<'tcx>,
@@ -1072,8 +1097,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
             Res::Def(DefKind::AssocFn | DefKind::Ctor(_, CtorKind::Fn) | DefKind::Variant, _) => {
                 let expected = "unit struct, unit variant or constant";
-                let e =
+                let e = report_unexpected_variant_res(tcx, res, None, qpath, span, E0533, expected);
-                    report_unexpected_variant_res(tcx, res, None, qpath, pat.span, E0533, expected);
                 return Ty::new_error(tcx, e);
             }
             Res::SelfCtor(def_id) => {
@@ -1088,7 +1112,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         res,
                         None,
                         qpath,
-                        pat.span,
+                        span,
                         E0533,
                         "unit struct",
                     );
@@ -1107,11 +1131,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
 
         // Type-check the path.
         let (pat_ty, pat_res) =
-            self.instantiate_value_path(segments, opt_ty, res, pat.span, pat.span, pat.hir_id);
+            self.instantiate_value_path(segments, opt_ty, res, span, span, hir_id);
         if let Err(err) =
-            self.demand_suptype_with_origin(&self.pattern_cause(ti, pat.span), expected, pat_ty)
+            self.demand_suptype_with_origin(&self.pattern_cause(ti, span), expected, pat_ty)
         {
-            self.emit_bad_pat_path(err, pat, res, pat_res, pat_ty, segments);
+            self.emit_bad_pat_path(err, hir_id, span, res, pat_res, pat_ty, segments);
         }
         pat_ty
     }
@@ -1154,13 +1178,13 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     fn emit_bad_pat_path(
         &self,
         mut e: Diag<'_>,
-        pat: &hir::Pat<'tcx>,
+        hir_id: HirId,
+        pat_span: Span,
         res: Res,
         pat_res: Res,
         pat_ty: Ty<'tcx>,
         segments: &'tcx [hir::PathSegment<'tcx>],
     ) {
-        let pat_span = pat.span;
         if let Some(span) = self.tcx.hir().res_span(pat_res) {
             e.span_label(span, format!("{} defined here", res.descr()));
             if let [hir::PathSegment { ident, .. }] = &*segments {
@@ -1173,7 +1197,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         res.descr(),
                     ),
                 );
-                match self.tcx.parent_hir_node(pat.hir_id) {
+                match self.tcx.parent_hir_node(hir_id) {
                     hir::Node::PatField(..) => {
                         e.span_suggestion_verbose(
                             ident.span.shrink_to_hi(),
@@ -1813,9 +1837,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     }
                 } else if inexistent_fields.len() == 1 {
                     match pat_field.pat.kind {
-                        PatKind::Lit(expr)
+                        PatKind::Expr(_)
                             if !self.may_coerce(
-                                self.typeck_results.borrow().expr_ty(expr),
+                                self.typeck_results.borrow().node_type(pat_field.pat.hir_id),
                                 self.field_ty(field.span, field_def, args),
                             ) => {}
                         _ => {

compiler/rustc_hir_typeck/src/upvar.rs

@@ -147,15 +147,16 @@ impl<'a, 'tcx> Visitor<'tcx> for InferBorrowKindVisitor<'a, 'tcx> {
                 self.visit_body(body);
                 self.fcx.analyze_closure(expr.hir_id, expr.span, body_id, body, capture_clause);
             }
-            hir::ExprKind::ConstBlock(anon_const) => {
-                let body = self.fcx.tcx.hir().body(anon_const.body);
-                self.visit_body(body);
-            }
             _ => {}
         }
 
         intravisit::walk_expr(self, expr);
     }
+
+    fn visit_inline_const(&mut self, c: &'tcx hir::ConstBlock) {
+        let body = self.fcx.tcx.hir().body(c.body);
+        self.visit_body(body);
+    }
 }
 
 impl<'a, 'tcx> FnCtxt<'a, 'tcx> {

compiler/rustc_hir_typeck/src/writeback.rs

@@ -246,6 +246,13 @@ impl<'cx, 'tcx> WritebackCx<'cx, 'tcx> {
             }
         }
     }
+
+    fn visit_const_block(&mut self, span: Span, anon_const: &hir::ConstBlock) {
+        self.visit_node_id(span, anon_const.hir_id);
+
+        let body = self.tcx().hir().body(anon_const.body);
+        self.visit_body(body);
+    }
 }
 
 ///////////////////////////////////////////////////////////////////////////
@@ -275,11 +282,8 @@ impl<'cx, 'tcx> Visitor<'tcx> for WritebackCx<'cx, 'tcx> {
             hir::ExprKind::Field(..) | hir::ExprKind::OffsetOf(..) => {
                 self.visit_field_id(e.hir_id);
             }
-            hir::ExprKind::ConstBlock(anon_const) => {
+            hir::ExprKind::ConstBlock(ref anon_const) => {
-                self.visit_node_id(e.span, anon_const.hir_id);
+                self.visit_const_block(e.span, anon_const);
-
-                let body = self.tcx().hir().body(anon_const.body);
-                self.visit_body(body);
             }
             _ => {}
         }
@@ -335,6 +339,14 @@ impl<'cx, 'tcx> Visitor<'tcx> for WritebackCx<'cx, 'tcx> {
         intravisit::walk_pat(self, p);
     }
 
+    fn visit_pat_expr(&mut self, expr: &'tcx hir::PatExpr<'tcx>) {
+        self.visit_node_id(expr.span, expr.hir_id);
+        if let hir::PatExprKind::ConstBlock(c) = &expr.kind {
+            self.visit_const_block(expr.span, c);
+        }
+        intravisit::walk_pat_expr(self, expr);
+    }
+
     fn visit_local(&mut self, l: &'tcx hir::LetStmt<'tcx>) {
         intravisit::walk_local(self, l);
         let var_ty = self.fcx.local_ty(l.span, l.hir_id);

compiler/rustc_lint/src/unused.rs

@@ -1220,7 +1220,7 @@ impl EarlyLintPass for UnusedParens {
             // Do not lint on `(..)` as that will result in the other arms being useless.
             Paren(_)
             // The other cases do not contain sub-patterns.
-            | Wild | Never | Rest | Lit(..) | MacCall(..) | Range(..) | Ident(.., None) | Path(..) | Err(_) => {},
+            | Wild | Never | Rest | Expr(..) | MacCall(..) | Range(..) | Ident(.., None) | Path(..) | Err(_) => {},
             // These are list-like patterns; parens can always be removed.
             TupleStruct(_, _, ps) | Tuple(ps) | Slice(ps) | Or(ps) => for p in ps {
                 self.check_unused_parens_pat(cx, p, false, false, keep_space);

compiler/rustc_middle/src/hir/map/mod.rs

@@ -938,6 +938,7 @@ impl<'hir> Map<'hir> {
             Node::OpaqueTy(op) => op.span,
             Node::Pat(pat) => pat.span,
             Node::PatField(field) => field.span,
+            Node::PatExpr(lit) => lit.span,
             Node::Arm(arm) => arm.span,
             Node::Block(block) => block.span,
             Node::Ctor(..) => self.span_with_body(self.tcx.parent_hir_id(hir_id)),
@@ -1209,6 +1210,7 @@ fn hir_id_to_string(map: Map<'_>, id: HirId) -> String {
         Node::OpaqueTy(_) => node_str("opaque type"),
         Node::Pat(_) => node_str("pat"),
         Node::PatField(_) => node_str("pattern field"),
+        Node::PatExpr(_) => node_str("pattern literal"),
         Node::Param(_) => node_str("param"),
         Node::Arm(_) => node_str("arm"),
         Node::Block(_) => node_str("block"),

compiler/rustc_mir_build/src/thir/pattern/mod.rs

@@ -154,7 +154,7 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
 
     fn lower_pattern_range_endpoint(
         &mut self,
-        expr: Option<&'tcx hir::Expr<'tcx>>,
+        expr: Option<&'tcx hir::PatExpr<'tcx>>,
     ) -> Result<
         (Option<PatRangeBoundary<'tcx>>, Option<Ascription<'tcx>>, Option<LocalDefId>),
         ErrorGuaranteed,
@@ -200,13 +200,12 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
     /// This is only called when the range is already known to be malformed.
     fn error_on_literal_overflow(
         &self,
-        expr: Option<&'tcx hir::Expr<'tcx>>,
+        expr: Option<&'tcx hir::PatExpr<'tcx>>,
         ty: Ty<'tcx>,
     ) -> Result<(), ErrorGuaranteed> {
-        use hir::{ExprKind, UnOp};
         use rustc_ast::ast::LitKind;
 
-        let Some(mut expr) = expr else {
+        let Some(expr) = expr else {
             return Ok(());
         };
         let span = expr.span;
@@ -214,12 +213,7 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
         // We need to inspect the original expression, because if we only inspect the output of
         // `eval_bits`, an overflowed value has already been wrapped around.
         // We mostly copy the logic from the `rustc_lint::OVERFLOWING_LITERALS` lint.
-        let mut negated = false;
+        let hir::PatExprKind::Lit { lit, negated } = expr.kind else {
-        if let ExprKind::Unary(UnOp::Neg, sub_expr) = expr.kind {
-            negated = true;
-            expr = sub_expr;
-        }
-        let ExprKind::Lit(lit) = expr.kind else {
             return Ok(());
         };
         let LitKind::Int(lit_val, _) = lit.node else {
@@ -248,8 +242,8 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
 
     fn lower_pattern_range(
         &mut self,
-        lo_expr: Option<&'tcx hir::Expr<'tcx>>,
+        lo_expr: Option<&'tcx hir::PatExpr<'tcx>>,
-        hi_expr: Option<&'tcx hir::Expr<'tcx>>,
+        hi_expr: Option<&'tcx hir::PatExpr<'tcx>>,
         end: RangeEnd,
         ty: Ty<'tcx>,
         span: Span,
@@ -330,7 +324,7 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
 
             hir::PatKind::Never => PatKind::Never,
 
-            hir::PatKind::Lit(value) => self.lower_lit(value),
+            hir::PatKind::Expr(value) => self.lower_lit(value),
 
             hir::PatKind::Range(ref lo_expr, ref hi_expr, end) => {
                 let (lo_expr, hi_expr) = (lo_expr.as_deref(), hi_expr.as_deref());
@@ -662,25 +656,18 @@ impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
     /// The special case for negation exists to allow things like `-128_i8`
     /// which would overflow if we tried to evaluate `128_i8` and then negate
     /// afterwards.
-    fn lower_lit(&mut self, expr: &'tcx hir::Expr<'tcx>) -> PatKind<'tcx> {
+    fn lower_lit(&mut self, expr: &'tcx hir::PatExpr<'tcx>) -> PatKind<'tcx> {
-        let (lit, neg) = match expr.kind {
+        let (lit, neg) = match &expr.kind {
-            hir::ExprKind::Path(ref qpath) => {
+            hir::PatExprKind::Path(qpath) => {
                 return self.lower_path(qpath, expr.hir_id, expr.span).kind;
             }
-            hir::ExprKind::ConstBlock(ref anon_const) => {
+            hir::PatExprKind::ConstBlock(anon_const) => {
                 return self.lower_inline_const(anon_const, expr.hir_id, expr.span);
             }
-            hir::ExprKind::Lit(ref lit) => (lit, false),
+            hir::PatExprKind::Lit { lit, negated } => (lit, *negated),
-            hir::ExprKind::Unary(hir::UnOp::Neg, ref expr) => {
-                let hir::ExprKind::Lit(ref lit) = expr.kind else {
-                    span_bug!(expr.span, "not a literal: {:?}", expr);
-                };
-                (lit, true)
-            }
-            _ => span_bug!(expr.span, "not a literal: {:?}", expr),
         };
 
-        let ct_ty = self.typeck_results.expr_ty(expr);
+        let ct_ty = self.typeck_results.node_type(expr.hir_id);
         let lit_input = LitToConstInput { lit: &lit.node, ty: ct_ty, neg };
         match self.tcx.at(expr.span).lit_to_const(lit_input) {
             Ok(constant) => self.const_to_pat(constant, ct_ty, expr.hir_id, lit.span).kind,

compiler/rustc_parse/src/parser/pat.rs

@@ -656,14 +656,14 @@ impl<'a> Parser<'a> {
             fn visit_pat(&mut self, p: &'a Pat) -> Self::Result {
                 match &p.kind {
                     // Base expression
-                    PatKind::Err(_) | PatKind::Lit(_) => {
+                    PatKind::Err(_) | PatKind::Expr(_) => {
                         self.maybe_add_suggestions_then_emit(p.span, p.span, false)
                     }
 
                     // Sub-patterns
                     // FIXME: this doesn't work with recursive subpats (`&mut &mut <err>`)
                     PatKind::Box(subpat) | PatKind::Ref(subpat, _)
-                        if matches!(subpat.kind, PatKind::Err(_) | PatKind::Lit(_)) =>
+                        if matches!(subpat.kind, PatKind::Err(_) | PatKind::Expr(_)) =>
                     {
                         self.maybe_add_suggestions_then_emit(subpat.span, p.span, false)
                     }
@@ -766,7 +766,7 @@ impl<'a> Parser<'a> {
             if let Some(re) = self.parse_range_end() {
                 self.parse_pat_range_begin_with(const_expr, re)?
             } else {
-                PatKind::Lit(const_expr)
+                PatKind::Expr(const_expr)
             }
         } else if self.is_builtin() {
             self.parse_pat_builtin()?
@@ -833,7 +833,7 @@ impl<'a> Parser<'a> {
                         .struct_span_err(self_.token.span, msg)
                         .with_span_label(self_.token.span, format!("expected {expected}"))
                 });
-            PatKind::Lit(self.mk_expr(lo, ExprKind::Lit(lit)))
+            PatKind::Expr(self.mk_expr(lo, ExprKind::Lit(lit)))
         } else {
             // Try to parse everything else as literal with optional minus
             match self.parse_literal_maybe_minus() {
@@ -845,7 +845,7 @@ impl<'a> Parser<'a> {
 
                     match self.parse_range_end() {
                         Some(form) => self.parse_pat_range_begin_with(begin, form)?,
-                        None => PatKind::Lit(begin),
+                        None => PatKind::Expr(begin),
                     }
                 }
                 Err(err) => return self.fatal_unexpected_non_pat(err, expected),
@@ -989,7 +989,7 @@ impl<'a> Parser<'a> {
 
             match &pat.kind {
                 // recover ranges with parentheses around the `(start)..`
-                PatKind::Lit(begin)
+                PatKind::Expr(begin)
                     if self.may_recover()
                         && let Some(form) = self.parse_range_end() =>
                 {

compiler/rustc_passes/src/input_stats.rs

@@ -304,7 +304,7 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
             Box,
             Deref,
             Ref,
-            Lit,
+            Expr,
             Guard,
             Range,
             Slice,
@@ -587,7 +587,7 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
             Box,
             Deref,
             Ref,
-            Lit,
+            Expr,
             Range,
             Slice,
             Rest,

src/librustdoc/clean/utils.rs

@@ -314,9 +314,9 @@ pub(crate) fn name_from_pat(p: &hir::Pat<'_>) -> Symbol {
         PatKind::Box(p) => return name_from_pat(p),
         PatKind::Deref(p) => format!("deref!({})", name_from_pat(p)),
         PatKind::Ref(p, _) => return name_from_pat(p),
-        PatKind::Lit(..) => {
+        PatKind::Expr(..) => {
             warn!(
-                "tried to get argument name from PatKind::Lit, which is silly in function arguments"
+                "tried to get argument name from PatKind::Expr, which is silly in function arguments"
             );
             return Symbol::intern("()");
         }

src/tools/clippy/clippy_lints/src/default_numeric_fallback.rs

@@ -3,8 +3,11 @@ use clippy_utils::numeric_literal;
 use clippy_utils::source::snippet_opt;
 use rustc_ast::ast::{LitFloatType, LitIntType, LitKind};
 use rustc_errors::Applicability;
-use rustc_hir::intravisit::{Visitor, walk_expr, walk_stmt};
+use rustc_hir::intravisit::{Visitor, walk_expr, walk_pat, walk_stmt};
-use rustc_hir::{Block, Body, ConstContext, Expr, ExprKind, FnRetTy, HirId, Lit, Stmt, StmtKind, StructTailExpr};
+use rustc_hir::{
+    Block, Body, ConstContext, Expr, ExprKind, FnRetTy, HirId, Lit, Pat, PatExpr, PatExprKind, PatKind, Stmt, StmtKind,
+    StructTailExpr,
+};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_middle::ty::{self, FloatTy, IntTy, PolyFnSig, Ty};
@@ -219,6 +222,22 @@ impl<'tcx> Visitor<'tcx> for NumericFallbackVisitor<'_, 'tcx> {
         walk_expr(self, expr);
     }
 
+    fn visit_pat(&mut self, pat: &'tcx Pat<'_>) {
+        match pat.kind {
+            PatKind::Expr(&PatExpr {
+                hir_id,
+                kind: PatExprKind::Lit { lit, .. },
+                ..
+            }) => {
+                let ty = self.cx.typeck_results().node_type(hir_id);
+                self.check_lit(lit, ty, hir_id);
+                return;
+            },
+            _ => {},
+        }
+        walk_pat(self, pat)
+    }
+
     fn visit_stmt(&mut self, stmt: &'tcx Stmt<'_>) {
         match stmt.kind {
             // we cannot check the exact type since it's a hir::Ty which does not implement `is_numeric`

src/tools/clippy/clippy_lints/src/equatable_if_let.rs

@@ -56,7 +56,7 @@ fn unary_pattern(pat: &Pat<'_>) -> bool {
         PatKind::Struct(_, a, etc) => !etc && a.iter().all(|x| unary_pattern(x.pat)),
         PatKind::Tuple(a, etc) | PatKind::TupleStruct(_, a, etc) => etc.as_opt_usize().is_none() && array_rec(a),
         PatKind::Ref(x, _) | PatKind::Box(x) | PatKind::Deref(x) | PatKind::Guard(x, _) => unary_pattern(x),
-        PatKind::Path(_) | PatKind::Lit(_) => true,
+        PatKind::Path(_) | PatKind::Expr(_) => true,
     }
 }
 

src/tools/clippy/clippy_lints/src/len_zero.rs

@@ -8,8 +8,8 @@ use rustc_hir::def::Res;
 use rustc_hir::def_id::{DefId, DefIdSet};
 use rustc_hir::{
     AssocItemKind, BinOpKind, Expr, ExprKind, FnRetTy, GenericArg, GenericBound, ImplItem, ImplItemKind,
-    ImplicitSelfKind, Item, ItemKind, Mutability, Node, OpaqueTyOrigin, PatKind, PathSegment, PrimTy, QPath,
+    ImplicitSelfKind, Item, ItemKind, Mutability, Node, OpaqueTyOrigin, PatExprKind, PatKind, PathSegment, PrimTy,
-    TraitItemRef, TyKind,
+    QPath, TraitItemRef, TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::{self, AssocKind, FnSig, Ty};
@@ -163,7 +163,13 @@ impl<'tcx> LateLintPass<'tcx> for LenZero {
         if let ExprKind::Let(lt) = expr.kind
             && match lt.pat.kind {
                 PatKind::Slice([], None, []) => true,
-                PatKind::Lit(lit) if is_empty_string(lit) => true,
+                PatKind::Expr(lit) => match lit.kind {
+                    PatExprKind::Lit { lit, .. } => match lit.node {
+                        LitKind::Str(lit, _) => lit.as_str().is_empty(),
+                        _ => false,
+                    },
+                    _ => false,
+                },
                 _ => false,
             }
             && !expr.span.from_expansion()

src/tools/clippy/clippy_lints/src/manual_is_ascii_check.rs

@@ -7,7 +7,7 @@ use clippy_utils::{higher, is_in_const_context, path_to_local, peel_ref_operator
 use rustc_ast::LitKind::{Byte, Char};
 use rustc_ast::ast::RangeLimits;
 use rustc_errors::Applicability;
-use rustc_hir::{Expr, ExprKind, Node, Param, PatKind, RangeEnd};
+use rustc_hir::{Expr, ExprKind, Node, Param, PatKind, RangeEnd, PatExpr, PatExprKind, Lit};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
 use rustc_session::impl_lint_pass;
@@ -115,7 +115,7 @@ impl<'tcx> LateLintPass<'tcx> for ManualIsAsciiCheck {
         {
             let arg = peel_ref_operators(cx, arg);
             let ty_sugg = get_ty_sugg(cx, arg, start);
-            let range = check_range(start, end);
+            let range = check_expr_range(start, end);
             check_is_ascii(cx, expr.span, arg, &range, ty_sugg);
         }
     }
@@ -196,19 +196,34 @@ fn check_pat(pat_kind: &PatKind<'_>) -> CharRange {
     }
 }
 
-fn check_range(start: &Expr<'_>, end: &Expr<'_>) -> CharRange {
+fn check_expr_range(start: &Expr<'_>, end: &Expr<'_>) -> CharRange {
     if let ExprKind::Lit(start_lit) = &start.kind
         && let ExprKind::Lit(end_lit) = &end.kind
     {
-        match (&start_lit.node, &end_lit.node) {
+        check_lit_range(start_lit, end_lit)
-            (Char('a'), Char('z')) | (Byte(b'a'), Byte(b'z')) => CharRange::LowerChar,
-            (Char('A'), Char('Z')) | (Byte(b'A'), Byte(b'Z')) => CharRange::UpperChar,
-            (Char('a'), Char('f')) | (Byte(b'a'), Byte(b'f')) => CharRange::LowerHexLetter,
-            (Char('A'), Char('F')) | (Byte(b'A'), Byte(b'F')) => CharRange::UpperHexLetter,
-            (Char('0'), Char('9')) | (Byte(b'0'), Byte(b'9')) => CharRange::Digit,
-            _ => CharRange::Otherwise,
-        }
     } else {
         CharRange::Otherwise
     }
 }
+
+
+fn check_range(start: &PatExpr<'_>, end: &PatExpr<'_>) -> CharRange {
+    if let PatExprKind::Lit{ lit: start_lit, negated: false } = &start.kind
+        && let PatExprKind::Lit{ lit: end_lit, negated: false  } = &end.kind
+    {
+        check_lit_range(start_lit, end_lit)
+    } else {
+        CharRange::Otherwise
+    }
+}
+
+fn check_lit_range(start_lit: &Lit, end_lit: &Lit) -> CharRange {
+    match (&start_lit.node, &end_lit.node) {
+        (Char('a'), Char('z')) | (Byte(b'a'), Byte(b'z')) => CharRange::LowerChar,
+        (Char('A'), Char('Z')) | (Byte(b'A'), Byte(b'Z')) => CharRange::UpperChar,
+        (Char('a'), Char('f')) | (Byte(b'a'), Byte(b'f')) => CharRange::LowerHexLetter,
+        (Char('A'), Char('F')) | (Byte(b'A'), Byte(b'F')) => CharRange::UpperHexLetter,
+        (Char('0'), Char('9')) | (Byte(b'0'), Byte(b'9')) => CharRange::Digit,
+        _ => CharRange::Otherwise,
+    }
+}

src/tools/clippy/clippy_lints/src/manual_range_patterns.rs

@@ -3,7 +3,7 @@ use clippy_utils::source::SpanRangeExt;
 use rustc_ast::LitKind;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
-use rustc_hir::{Expr, ExprKind, PatKind, RangeEnd, UnOp};
+use rustc_hir::{PatExpr, PatExprKind, PatKind, RangeEnd};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_session::declare_lint_pass;
@@ -38,14 +38,13 @@ declare_clippy_lint! {
 }
 declare_lint_pass!(ManualRangePatterns => [MANUAL_RANGE_PATTERNS]);
 
-fn expr_as_i128(expr: &Expr<'_>) -> Option<i128> {
+fn expr_as_i128(expr: &PatExpr<'_>) -> Option<i128> {
-    if let ExprKind::Unary(UnOp::Neg, expr) = expr.kind {
+    if let PatExprKind::Lit { lit, negated } = expr.kind
-        expr_as_i128(expr).map(|num| -num)
-    } else if let ExprKind::Lit(lit) = expr.kind
         && let LitKind::Int(num, _) = lit.node
     {
         // Intentionally not handling numbers greater than i128::MAX (for u128 literals) for now.
-        num.get().try_into().ok()
+        let n = i128::try_from(num.get()).ok()?;
+        Some(if negated { -n } else { n })
     } else {
         None
     }
@@ -58,7 +57,7 @@ struct Num {
 }
 
 impl Num {
-    fn new(expr: &Expr<'_>) -> Option<Self> {
+    fn new(expr: &PatExpr<'_>) -> Option<Self> {
         Some(Self {
             val: expr_as_i128(expr)?,
             span: expr.span,
@@ -90,7 +89,7 @@ impl LateLintPass<'_> for ManualRangePatterns {
             let mut ranges_found = Vec::new();
 
             for pat in pats {
-                if let PatKind::Lit(lit) = pat.kind
+                if let PatKind::Expr(lit) = pat.kind
                     && let Some(num) = Num::new(lit)
                 {
                     numbers_found.insert(num.val);

src/tools/clippy/clippy_lints/src/matches/match_bool.rs

@@ -4,7 +4,7 @@ use clippy_utils::source::{expr_block, snippet};
 use clippy_utils::sugg::Sugg;
 use rustc_ast::LitKind;
 use rustc_errors::Applicability;
-use rustc_hir::{Arm, Expr, ExprKind, PatKind};
+use rustc_hir::{Arm, Expr, PatExprKind, PatKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty;
 
@@ -21,8 +21,8 @@ pub(crate) fn check(cx: &LateContext<'_>, scrutinee: &Expr<'_>, arms: &[Arm<'_>]
             move |diag| {
                 if arms.len() == 2 {
                     // no guards
-                    let exprs = if let PatKind::Lit(arm_bool) = arms[0].pat.kind {
+                    let exprs = if let PatKind::Expr(arm_bool) = arms[0].pat.kind {
-                        if let ExprKind::Lit(lit) = arm_bool.kind {
+                        if let PatExprKind::Lit { lit, .. } = arm_bool.kind {
                             match lit.node {
                                 LitKind::Bool(true) => Some((arms[0].body, arms[1].body)),
                                 LitKind::Bool(false) => Some((arms[1].body, arms[0].body)),

src/tools/clippy/clippy_lints/src/matches/match_same_arms.rs

@@ -7,7 +7,7 @@ use rustc_arena::DroplessArena;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::def_id::DefId;
-use rustc_hir::{Arm, Expr, ExprKind, HirId, HirIdMap, HirIdMapEntry, HirIdSet, Pat, PatKind, RangeEnd};
+use rustc_hir::{Arm, Expr, HirId, HirIdMap, HirIdMapEntry, HirIdSet, Pat, PatExprKind, PatKind, RangeEnd};
 use rustc_lint::builtin::NON_EXHAUSTIVE_OMITTED_PATTERNS;
 use rustc_lint::{LateContext, LintContext};
 use rustc_middle::ty;
@@ -311,9 +311,9 @@ impl<'a> NormalizedPat<'a> {
                 );
                 Self::Tuple(None, pats)
             },
-            PatKind::Lit(e) => match &e.kind {
+            PatKind::Expr(e) => match &e.kind {
                 // TODO: Handle negative integers. They're currently treated as a wild match.
-                ExprKind::Lit(lit) => match lit.node {
+                PatExprKind::Lit { lit, negated: false } => match lit.node {
                     LitKind::Str(sym, _) => Self::LitStr(sym),
                     LitKind::ByteStr(ref bytes, _) | LitKind::CStr(ref bytes, _) => Self::LitBytes(bytes),
                     LitKind::Byte(val) => Self::LitInt(val.into()),
@@ -330,7 +330,7 @@ impl<'a> NormalizedPat<'a> {
                 let start = match start {
                     None => 0,
                     Some(e) => match &e.kind {
-                        ExprKind::Lit(lit) => match lit.node {
+                        PatExprKind::Lit { lit, negated: false } => match lit.node {
                             LitKind::Int(val, _) => val.get(),
                             LitKind::Char(val) => val.into(),
                             LitKind::Byte(val) => val.into(),
@@ -342,7 +342,7 @@ impl<'a> NormalizedPat<'a> {
                 let (end, bounds) = match end {
                     None => (u128::MAX, RangeEnd::Included),
                     Some(e) => match &e.kind {
-                        ExprKind::Lit(lit) => match lit.node {
+                        PatExprKind::Lit { lit, negated: false } => match lit.node {
                             LitKind::Int(val, _) => (val.get(), bounds),
                             LitKind::Char(val) => (val.into(), bounds),
                             LitKind::Byte(val) => (val.into(), bounds),

src/tools/clippy/clippy_lints/src/matches/match_str_case_mismatch.rs

@@ -5,7 +5,7 @@ use clippy_utils::ty::is_type_lang_item;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{Visitor, walk_expr};
-use rustc_hir::{Arm, Expr, ExprKind, LangItem, PatKind};
+use rustc_hir::{Arm, Expr, ExprKind, PatExpr, PatExprKind, LangItem, PatKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty;
 use rustc_span::Span;
@@ -85,8 +85,8 @@ fn verify_case<'a>(case_method: &'a CaseMethod, arms: &'a [Arm<'_>]) -> Option<(
     };
 
     for arm in arms {
-        if let PatKind::Lit(Expr {
+        if let PatKind::Expr(PatExpr {
-            kind: ExprKind::Lit(lit),
+            kind: PatExprKind::Lit { lit, negated: false },
             ..
         }) = arm.pat.kind
             && let LitKind::Str(symbol, _) = lit.node

src/tools/clippy/clippy_lints/src/matches/needless_match.rs

@@ -8,7 +8,7 @@ use clippy_utils::{
 };
 use rustc_errors::Applicability;
 use rustc_hir::LangItem::OptionNone;
-use rustc_hir::{Arm, BindingMode, ByRef, Expr, ExprKind, ItemKind, Node, Pat, PatKind, Path, QPath};
+use rustc_hir::{Arm, BindingMode, ByRef, Expr, ExprKind, ItemKind, Node, Pat, PatExprKind, PatKind, Path, QPath};
 use rustc_lint::LateContext;
 use rustc_span::sym;
 
@@ -133,7 +133,7 @@ fn expr_ty_matches_p_ty(cx: &LateContext<'_>, expr: &Expr<'_>, p_expr: &Expr<'_>
         },
         // compare match_expr ty with RetTy in `fn foo() -> RetTy`
         Node::Item(item) => {
-            if let ItemKind::Fn{ .. } = item.kind {
+            if let ItemKind::Fn { .. } = item.kind {
                 let output = cx
                     .tcx
                     .fn_sig(item.owner_id)
@@ -189,8 +189,12 @@ fn pat_same_as_expr(pat: &Pat<'_>, expr: &Expr<'_>) -> bool {
             });
         },
         // Example: `5 => 5`
-        (PatKind::Lit(pat_lit_expr), ExprKind::Lit(expr_spanned)) => {
+        (PatKind::Expr(pat_expr_expr), ExprKind::Lit(expr_spanned)) => {
-            if let ExprKind::Lit(pat_spanned) = &pat_lit_expr.kind {
+            if let PatExprKind::Lit {
+                lit: pat_spanned,
+                negated: false,
+            } = &pat_expr_expr.kind
+            {
                 return pat_spanned.node == expr_spanned.node;
             }
         },

src/tools/clippy/clippy_lints/src/matches/overlapping_arms.rs

@@ -34,13 +34,13 @@ fn all_ranges<'tcx>(cx: &LateContext<'tcx>, arms: &'tcx [Arm<'_>], ty: Ty<'tcx>)
             if let Arm { pat, guard: None, .. } = *arm {
                 if let PatKind::Range(ref lhs, ref rhs, range_end) = pat.kind {
                     let lhs_const = if let Some(lhs) = lhs {
-                        ConstEvalCtxt::new(cx).eval(lhs)?
+                        ConstEvalCtxt::new(cx).eval_pat_expr(lhs)?
                     } else {
                         let min_val_const = ty.numeric_min_val(cx.tcx)?;
                         mir_to_const(cx.tcx, mir::Const::from_ty_const(min_val_const, ty, cx.tcx))?
                     };
                     let rhs_const = if let Some(rhs) = rhs {
-                        ConstEvalCtxt::new(cx).eval(rhs)?
+                        ConstEvalCtxt::new(cx).eval_pat_expr(rhs)?
                     } else {
                         let max_val_const = ty.numeric_max_val(cx.tcx)?;
                         mir_to_const(cx.tcx, mir::Const::from_ty_const(max_val_const, ty, cx.tcx))?
@@ -57,8 +57,10 @@ fn all_ranges<'tcx>(cx: &LateContext<'tcx>, arms: &'tcx [Arm<'_>], ty: Ty<'tcx>)
                     });
                 }
 
-                if let PatKind::Lit(value) = pat.kind {
+                if let PatKind::Expr(value) = pat.kind {
-                    let value = ConstEvalCtxt::new(cx).eval_full_int(value)?;
+                    let value = ConstEvalCtxt::new(cx)
+                        .eval_pat_expr(value)?
+                        .int_value(cx.tcx, cx.typeck_results().node_type(pat.hir_id))?;
                     return Some(SpannedRange {
                         span: pat.span,
                         node: (value, EndBound::Included(value)),

src/tools/clippy/clippy_lints/src/matches/redundant_pattern_match.rs

@@ -9,7 +9,7 @@ use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::LangItem::{self, OptionNone, OptionSome, PollPending, PollReady, ResultErr, ResultOk};
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::{Arm, Expr, ExprKind, Node, Pat, PatKind, QPath, UnOp};
+use rustc_hir::{Arm, Expr, ExprKind, Node, Pat, PatExprKind, PatKind, QPath, UnOp};
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, GenericArgKind, Ty};
 use rustc_span::{Span, Symbol, sym};
@@ -74,8 +74,8 @@ fn find_match_true<'tcx>(
     span: Span,
     message: &'static str,
 ) {
-    if let PatKind::Lit(lit) = pat.kind
+    if let PatKind::Expr(lit) = pat.kind
-        && let ExprKind::Lit(lit) = lit.kind
+        && let PatExprKind::Lit { lit, negated: false } = lit.kind
         && let LitKind::Bool(pat_is_true) = lit.node
     {
         let mut applicability = Applicability::MachineApplicable;

src/tools/clippy/clippy_lints/src/matches/single_match.rs

@@ -9,7 +9,7 @@ use rustc_arena::DroplessArena;
 use rustc_errors::Applicability;
 use rustc_hir::def::{DefKind, Res};
 use rustc_hir::intravisit::{Visitor, walk_pat};
-use rustc_hir::{Arm, Expr, ExprKind, HirId, Node, Pat, PatKind, QPath, StmtKind};
+use rustc_hir::{Arm, Expr, ExprKind, HirId, Node, Pat, PatExpr, PatExprKind, PatKind, QPath, StmtKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, AdtDef, TyCtxt, TypeckResults, VariantDef};
 use rustc_span::{Span, sym};
@@ -114,7 +114,7 @@ fn report_single_pattern(cx: &LateContext<'_>, ex: &Expr<'_>, arm: &Arm<'_>, exp
     }
 
     let (pat, pat_ref_count) = peel_hir_pat_refs(arm.pat);
-    let (msg, sugg) = if let PatKind::Path(_) | PatKind::Lit(_) = pat.kind
+    let (msg, sugg) = if let PatKind::Path(_) | PatKind::Expr(_) = pat.kind
         && let (ty, ty_ref_count) = peel_middle_ty_refs(cx.typeck_results().expr_ty(ex))
         && let Some(spe_trait_id) = cx.tcx.lang_items().structural_peq_trait()
         && let Some(pe_trait_id) = cx.tcx.lang_items().eq_trait()
@@ -126,8 +126,8 @@ fn report_single_pattern(cx: &LateContext<'_>, ex: &Expr<'_>, arm: &Arm<'_>, exp
         // scrutinee derives PartialEq and the pattern is a constant.
         let pat_ref_count = match pat.kind {
             // string literals are already a reference.
-            PatKind::Lit(Expr {
+            PatKind::Expr(PatExpr {
-                kind: ExprKind::Lit(lit),
+                kind: PatExprKind::Lit { lit, negated: false },
                 ..
             }) if lit.node.is_str() || lit.node.is_bytestr() => pat_ref_count + 1,
             _ => pat_ref_count,
@@ -384,7 +384,7 @@ impl<'a> PatState<'a> {
 
             PatKind::Wild
             | PatKind::Binding(_, _, _, None)
-            | PatKind::Lit(_)
+            | PatKind::Expr(_)
             | PatKind::Range(..)
             | PatKind::Path(_)
             | PatKind::Never

src/tools/clippy/clippy_lints/src/string_patterns.rs

@@ -11,7 +11,7 @@ use clippy_utils::visitors::{Descend, for_each_expr};
 use itertools::Itertools;
 use rustc_ast::{BinOpKind, LitKind};
 use rustc_errors::Applicability;
-use rustc_hir::{Expr, ExprKind, PatKind};
+use rustc_hir::{Expr, ExprKind, PatExprKind, PatKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
 use rustc_session::impl_lint_pass;
@@ -171,7 +171,7 @@ fn check_manual_pattern_char_comparison(cx: &LateContext<'_>, method_arg: &Expr<
                         return ControlFlow::Break(());
                     }
                     if arm.pat.walk_short(|pat| match pat.kind {
-                        PatKind::Lit(expr) if let ExprKind::Lit(lit) = expr.kind => {
+                        PatKind::Expr(expr) if let PatExprKind::Lit { lit, negated: false } = expr.kind => {
                             if let LitKind::Char(_) = lit.node {
                                 set_char_spans.push(lit.span);
                             }

src/tools/clippy/clippy_lints/src/unnested_or_patterns.rs

@@ -92,7 +92,7 @@ impl EarlyLintPass for UnnestedOrPatterns {
 }
 
 fn lint_unnested_or_patterns(cx: &EarlyContext<'_>, pat: &Pat) {
-    if let Ident(.., None) | Lit(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_) = pat.kind {
+    if let Ident(.., None) | Expr(_) | Wild | Path(..) | Range(..) | Rest | MacCall(_) = pat.kind {
         // This is a leaf pattern, so cloning is unprofitable.
         return;
     }
@@ -228,7 +228,7 @@ fn transform_with_focus_on_idx(alternatives: &mut ThinVec<P<Pat>>, focus_idx: us
         // Therefore they are not some form of constructor `C`,
         // with which a pattern `C(p_0)` may be formed,
         // which we would want to join with other `C(p_j)`s.
-        Ident(.., None) | Lit(_) | Wild | Err(_) | Never | Path(..) | Range(..) | Rest | MacCall(_)
+        Ident(.., None) | Expr(_) | Wild | Err(_) | Never | Path(..) | Range(..) | Rest | MacCall(_)
         // Skip immutable refs, as grouping them saves few characters,
         // and almost always requires adding parens (increasing noisiness).
         // In the case of only two patterns, replacement adds net characters.

src/tools/clippy/clippy_lints/src/utils/author.rs

@@ -4,7 +4,7 @@ use rustc_ast::ast::{LitFloatType, LitKind};
 use rustc_data_structures::fx::FxHashMap;
 use rustc_hir::{
     self as hir, BindingMode, CaptureBy, Closure, ClosureKind, ConstArg, ConstArgKind, CoroutineKind, ExprKind,
-    FnRetTy, HirId, Lit, PatKind, QPath, StmtKind, StructTailExpr, TyKind,
+    FnRetTy, HirId, Lit, PatExprKind, PatKind, QPath, StmtKind, StructTailExpr, TyKind,
 };
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_session::declare_lint_pass;
@@ -643,6 +643,27 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
         self.expr(expr);
     }
 
+    fn pat_expr(&self, lit: &Binding<&hir::PatExpr<'_>>) {
+        let kind = |kind| chain!(self, "let PatExprKind::{kind} = {lit}.kind");
+        macro_rules! kind {
+            ($($t:tt)*) => (kind(format_args!($($t)*)));
+        }
+        match lit.value.kind {
+            PatExprKind::Lit { lit, negated } => {
+                bind!(self, lit);
+                bind!(self, negated);
+                kind!("Lit{{ref {lit}, {negated} }}");
+                self.lit(lit);
+            },
+            PatExprKind::ConstBlock(_) => kind!("ConstBlock(_)"),
+            PatExprKind::Path(ref qpath) => {
+                bind!(self, qpath);
+                kind!("Path(ref {qpath})");
+                self.qpath(qpath);
+            },
+        }
+    }
+
     fn pat(&self, pat: &Binding<&hir::Pat<'_>>) {
         let kind = |kind| chain!(self, "let PatKind::{kind} = {pat}.kind");
         macro_rules! kind {
@@ -717,17 +738,17 @@ impl<'a, 'tcx> PrintVisitor<'a, 'tcx> {
                 kind!("Guard({pat}, {cond})");
                 self.pat(pat);
                 self.expr(cond);
-            }
+            },
-            PatKind::Lit(lit_expr) => {
+            PatKind::Expr(lit_expr) => {
                 bind!(self, lit_expr);
-                kind!("Lit({lit_expr})");
+                kind!("Expr({lit_expr})");
-                self.expr(lit_expr);
+                self.pat_expr(lit_expr);
             },
             PatKind::Range(start, end, end_kind) => {
                 opt_bind!(self, start, end);
                 kind!("Range({start}, {end}, RangeEnd::{end_kind:?})");
-                start.if_some(|e| self.expr(e));
+                start.if_some(|e| self.pat_expr(e));
-                end.if_some(|e| self.expr(e));
+                end.if_some(|e| self.pat_expr(e));
             },
             PatKind::Slice(start, middle, end) => {
                 bind!(self, start, end);

src/tools/clippy/clippy_utils/src/ast_utils/mod.rs

@@ -36,7 +36,7 @@ pub fn eq_pat(l: &Pat, r: &Pat) -> bool {
         (Paren(l), _) => eq_pat(l, r),
         (_, Paren(r)) => eq_pat(l, r),
         (Wild, Wild) | (Rest, Rest) => true,
-        (Lit(l), Lit(r)) => eq_expr(l, r),
+        (Expr(l), Expr(r)) => eq_expr(l, r),
         (Ident(b1, i1, s1), Ident(b2, i2, s2)) => {
             b1 == b2 && eq_id(*i1, *i2) && both(s1.as_deref(), s2.as_deref(), eq_pat)
         },

src/tools/clippy/clippy_utils/src/consts.rs

@@ -4,7 +4,6 @@
 //! executable MIR bodies, so we have to do this instead.
 #![allow(clippy::float_cmp)]
 
-use crate::macros::HirNode;
 use crate::source::{SpanRangeExt, walk_span_to_context};
 use crate::{clip, is_direct_expn_of, sext, unsext};
 
@@ -13,7 +12,7 @@ use rustc_apfloat::ieee::{Half, Quad};
 use rustc_ast::ast::{self, LitFloatType, LitKind};
 use rustc_data_structures::sync::Lrc;
 use rustc_hir::def::{DefKind, Res};
-use rustc_hir::{BinOp, BinOpKind, Block, ConstBlock, Expr, ExprKind, HirId, Item, ItemKind, Node, QPath, UnOp};
+use rustc_hir::{BinOp, BinOpKind, Block, ConstBlock, Expr, ExprKind, HirId, Item, ItemKind, Node, QPath, UnOp, PatExpr, PatExprKind};
 use rustc_lexer::tokenize;
 use rustc_lint::LateContext;
 use rustc_middle::mir::ConstValue;
@@ -442,30 +441,48 @@ impl<'tcx> ConstEvalCtxt<'tcx> {
         }
     }
 
+    pub fn eval_pat_expr(&self, pat_expr: &PatExpr<'_>) -> Option<Constant<'tcx>> {
+        match &pat_expr.kind {
+            PatExprKind::Lit { lit, negated } => {
+                let ty = self.typeck.node_type_opt(pat_expr.hir_id);
+                let val = lit_to_mir_constant(&lit.node, ty);
+                if *negated {
+                    self.constant_negate(&val, ty?)
+                } else {
+                    Some(val)
+                }
+            }
+            PatExprKind::ConstBlock(ConstBlock { body, ..}) => self.expr(self.tcx.hir().body(*body).value),
+            PatExprKind::Path(qpath) => self.qpath(qpath, pat_expr.hir_id),
+        }
+    }
+
+    fn qpath(&self, qpath: &QPath<'_>, hir_id: HirId) -> Option<Constant<'tcx>> {
+        let is_core_crate = if let Some(def_id) = self.typeck.qpath_res(qpath, hir_id).opt_def_id() {
+            self.tcx.crate_name(def_id.krate) == sym::core
+        } else {
+            false
+        };
+        self.fetch_path_and_apply(qpath, hir_id, self.typeck.node_type(hir_id), |self_, result| {
+            let result = mir_to_const(self_.tcx, result)?;
+            // If source is already Constant we wouldn't want to override it with CoreConstant
+            self_.source.set(
+                if is_core_crate && !matches!(self_.source.get(), ConstantSource::Constant) {
+                    ConstantSource::CoreConstant
+                } else {
+                    ConstantSource::Constant
+                },
+            );
+            Some(result)
+        })
+    }
+
     /// Simple constant folding: Insert an expression, get a constant or none.
     fn expr(&self, e: &Expr<'_>) -> Option<Constant<'tcx>> {
         match e.kind {
             ExprKind::ConstBlock(ConstBlock { body, .. }) => self.expr(self.tcx.hir().body(body).value),
             ExprKind::DropTemps(e) => self.expr(e),
-            ExprKind::Path(ref qpath) => {
+            ExprKind::Path(ref qpath) => self.qpath(qpath, e.hir_id),
-                let is_core_crate = if let Some(def_id) = self.typeck.qpath_res(qpath, e.hir_id()).opt_def_id() {
-                    self.tcx.crate_name(def_id.krate) == sym::core
-                } else {
-                    false
-                };
-                self.fetch_path_and_apply(qpath, e.hir_id, self.typeck.expr_ty(e), |self_, result| {
-                    let result = mir_to_const(self_.tcx, result)?;
-                    // If source is already Constant we wouldn't want to override it with CoreConstant
-                    self_.source.set(
-                        if is_core_crate && !matches!(self_.source.get(), ConstantSource::Constant) {
-                            ConstantSource::CoreConstant
-                        } else {
-                            ConstantSource::Constant
-                        },
-                    );
-                    Some(result)
-                })
-            },
             ExprKind::Block(block, _) => self.block(block),
             ExprKind::Lit(lit) => {
                 if is_direct_expn_of(e.span, "cfg").is_some() {

src/tools/clippy/clippy_utils/src/hir_utils.rs

@@ -9,8 +9,8 @@ use rustc_hir::def::{DefKind, Res};
 use rustc_hir::{
     AssocItemConstraint, BinOpKind, BindingMode, Block, BodyId, Closure, ConstArg, ConstArgKind, Expr, ExprField,
     ExprKind, FnRetTy, GenericArg, GenericArgs, HirId, HirIdMap, InlineAsmOperand, LetExpr, Lifetime, LifetimeName,
-    Pat, PatField, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind, StructTailExpr, TraitBoundModifiers, Ty,
+    Pat, PatExpr, PatExprKind, PatField, PatKind, Path, PathSegment, PrimTy, QPath, Stmt, StmtKind, StructTailExpr,
-    TyKind,
+    TraitBoundModifiers, Ty, TyKind,
 };
 use rustc_lexer::{TokenKind, tokenize};
 use rustc_lint::LateContext;
@@ -489,6 +489,24 @@ impl HirEqInterExpr<'_, '_, '_> {
         li.name == ri.name && self.eq_pat(lp, rp)
     }
 
+    fn eq_pat_expr(&mut self, left: &PatExpr<'_>, right: &PatExpr<'_>) -> bool {
+        match (&left.kind, &right.kind) {
+            (
+                &PatExprKind::Lit {
+                    lit: left,
+                    negated: left_neg,
+                },
+                &PatExprKind::Lit {
+                    lit: right,
+                    negated: right_neg,
+                },
+            ) => left_neg == right_neg && left.node == right.node,
+            (PatExprKind::ConstBlock(left), PatExprKind::ConstBlock(right)) => self.eq_body(left.body, right.body),
+            (PatExprKind::Path(left), PatExprKind::Path(right)) => self.eq_qpath(left, right),
+            (PatExprKind::Lit { .. } | PatExprKind::ConstBlock(..) | PatExprKind::Path(..), _) => false,
+        }
+    }
+
     /// Checks whether two patterns are the same.
     fn eq_pat(&mut self, left: &Pat<'_>, right: &Pat<'_>) -> bool {
         match (&left.kind, &right.kind) {
@@ -507,11 +525,11 @@ impl HirEqInterExpr<'_, '_, '_> {
                 eq
             },
             (PatKind::Path(l), PatKind::Path(r)) => self.eq_qpath(l, r),
-            (&PatKind::Lit(l), &PatKind::Lit(r)) => self.eq_expr(l, r),
+            (&PatKind::Expr(l), &PatKind::Expr(r)) => self.eq_pat_expr(l, r),
             (&PatKind::Tuple(l, ls), &PatKind::Tuple(r, rs)) => ls == rs && over(l, r, |l, r| self.eq_pat(l, r)),
             (&PatKind::Range(ref ls, ref le, li), &PatKind::Range(ref rs, ref re, ri)) => {
-                both(ls.as_ref(), rs.as_ref(), |a, b| self.eq_expr(a, b))
+                both(ls.as_ref(), rs.as_ref(), |a, b| self.eq_pat_expr(a, b))
-                    && both(le.as_ref(), re.as_ref(), |a, b| self.eq_expr(a, b))
+                    && both(le.as_ref(), re.as_ref(), |a, b| self.eq_pat_expr(a, b))
                     && (li == ri)
             },
             (&PatKind::Ref(le, ref lm), &PatKind::Ref(re, ref rm)) => lm == rm && self.eq_pat(le, re),
@@ -1073,6 +1091,18 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
         // self.maybe_typeck_results.unwrap().qpath_res(p, id).hash(&mut self.s);
     }
 
+    pub fn hash_pat_expr(&mut self, lit: &PatExpr<'_>) {
+        std::mem::discriminant(&lit.kind).hash(&mut self.s);
+        match &lit.kind {
+            PatExprKind::Lit { lit, negated } => {
+                lit.node.hash(&mut self.s);
+                negated.hash(&mut self.s);
+            },
+            PatExprKind::ConstBlock(c) => self.hash_body(c.body),
+            PatExprKind::Path(qpath) => self.hash_qpath(qpath),
+        }
+    }
+
     pub fn hash_pat(&mut self, pat: &Pat<'_>) {
         std::mem::discriminant(&pat.kind).hash(&mut self.s);
         match pat.kind {
@@ -1084,7 +1114,7 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
                 }
             },
             PatKind::Box(pat) | PatKind::Deref(pat) => self.hash_pat(pat),
-            PatKind::Lit(expr) => self.hash_expr(expr),
+            PatKind::Expr(expr) => self.hash_pat_expr(expr),
             PatKind::Or(pats) => {
                 for pat in pats {
                     self.hash_pat(pat);
@@ -1093,10 +1123,10 @@ impl<'a, 'tcx> SpanlessHash<'a, 'tcx> {
             PatKind::Path(ref qpath) => self.hash_qpath(qpath),
             PatKind::Range(s, e, i) => {
                 if let Some(s) = s {
-                    self.hash_expr(s);
+                    self.hash_pat_expr(s);
                 }
                 if let Some(e) = e {
-                    self.hash_expr(e);
+                    self.hash_pat_expr(e);
                 }
                 std::mem::discriminant(&i).hash(&mut self.s);
             },

src/tools/clippy/clippy_utils/src/lib.rs

@@ -1777,7 +1777,7 @@ pub fn is_refutable(cx: &LateContext<'_>, pat: &Pat<'_>) -> bool {
                 },
             }
         },
-        PatKind::Lit(..) | PatKind::Range(..) | PatKind::Err(_) | PatKind::Deref(_) | PatKind::Guard(..) => true,
+        PatKind::Expr(..) | PatKind::Range(..) | PatKind::Err(_) | PatKind::Deref(_) | PatKind::Guard(..) => true,
     }
 }
 

src/tools/clippy/tests/ui/author/if.stdout

@@ -30,8 +30,8 @@ if let StmtKind::Let(local) = stmt.kind
 }
 if let ExprKind::If(cond, then, Some(else_expr)) = expr.kind
     && let ExprKind::Let(let_expr) = cond.kind
-    && let PatKind::Lit(lit_expr) = let_expr.pat.kind
+    && let PatKind::Expr(lit_expr) = let_expr.pat.kind
-    && let ExprKind::Lit(ref lit) = lit_expr.kind
+    && let PatExprKind::Lit{ref lit, negated } = lit_expr.kind
     && let LitKind::Bool(true) = lit.node
     && let ExprKind::Path(ref qpath) = let_expr.init.kind
     && match_qpath(qpath, &["a"])

src/tools/clippy/tests/ui/author/loop.stdout

@@ -76,8 +76,8 @@ if let Some(higher::While { condition: condition, body: body }) = higher::While:
     // report your lint here
 }
 if let Some(higher::WhileLet { let_pat: let_pat, let_expr: let_expr, if_then: if_then }) = higher::WhileLet::hir(expr)
-    && let PatKind::Lit(lit_expr) = let_pat.kind
+    && let PatKind::Expr(lit_expr) = let_pat.kind
-    && let ExprKind::Lit(ref lit) = lit_expr.kind
+    && let PatExprKind::Lit{ref lit, negated } = lit_expr.kind
     && let LitKind::Bool(true) = lit.node
     && let ExprKind::Path(ref qpath) = let_expr.kind
     && match_qpath(qpath, &["a"])

src/tools/clippy/tests/ui/author/matches.stdout

@@ -4,14 +4,14 @@ if let StmtKind::Let(local) = stmt.kind
     && let ExprKind::Lit(ref lit) = scrutinee.kind
     && let LitKind::Int(42, LitIntType::Unsuffixed) = lit.node
     && arms.len() == 3
-    && let PatKind::Lit(lit_expr) = arms[0].pat.kind
+    && let PatKind::Expr(lit_expr) = arms[0].pat.kind
-    && let ExprKind::Lit(ref lit1) = lit_expr.kind
+    && let PatExprKind::Lit{ref lit1, negated } = lit_expr.kind
     && let LitKind::Int(16, LitIntType::Unsuffixed) = lit1.node
     && arms[0].guard.is_none()
     && let ExprKind::Lit(ref lit2) = arms[0].body.kind
     && let LitKind::Int(5, LitIntType::Unsuffixed) = lit2.node
-    && let PatKind::Lit(lit_expr1) = arms[1].pat.kind
+    && let PatKind::Expr(lit_expr1) = arms[1].pat.kind
-    && let ExprKind::Lit(ref lit3) = lit_expr1.kind
+    && let PatExprKind::Lit{ref lit3, negated1 } = lit_expr1.kind
     && let LitKind::Int(17, LitIntType::Unsuffixed) = lit3.node
     && arms[1].guard.is_none()
     && let ExprKind::Block(block, None) = arms[1].body.kind

src/tools/clippy/tests/ui/author/struct.stdout

@@ -23,8 +23,8 @@ if let PatKind::Struct(ref qpath, fields, false) = arm.pat.kind
     && match_qpath(qpath, &["Test"])
     && fields.len() == 1
     && fields[0].ident.as_str() == "field"
-    && let PatKind::Lit(lit_expr) = fields[0].pat.kind
+    && let PatKind::Expr(lit_expr) = fields[0].pat.kind
-    && let ExprKind::Lit(ref lit) = lit_expr.kind
+    && let PatExprKind::Lit{ref lit, negated } = lit_expr.kind
     && let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node
     && arm.guard.is_none()
     && let ExprKind::Block(block, None) = arm.body.kind
@@ -36,8 +36,8 @@ if let PatKind::Struct(ref qpath, fields, false) = arm.pat.kind
 if let PatKind::TupleStruct(ref qpath, fields, None) = arm.pat.kind
     && match_qpath(qpath, &["TestTuple"])
     && fields.len() == 1
-    && let PatKind::Lit(lit_expr) = fields[0].kind
+    && let PatKind::Expr(lit_expr) = fields[0].kind
-    && let ExprKind::Lit(ref lit) = lit_expr.kind
+    && let PatExprKind::Lit{ref lit, negated } = lit_expr.kind
     && let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node
     && arm.guard.is_none()
     && let ExprKind::Block(block, None) = arm.body.kind

src/tools/rustfmt/src/patterns.rs

@@ -42,7 +42,7 @@ fn is_short_pattern_inner(pat: &ast::Pat) -> bool {
         | ast::PatKind::Never
         | ast::PatKind::Wild
         | ast::PatKind::Err(_)
-        | ast::PatKind::Lit(_) => true,
+        | ast::PatKind::Expr(_) => true,
         ast::PatKind::Ident(_, _, ref pat) => pat.is_none(),
         ast::PatKind::Struct(..)
         | ast::PatKind::MacCall(..)
@@ -293,7 +293,7 @@ impl Rewrite for Pat {
                 let path_str = rewrite_path(context, PathContext::Expr, q_self, path, shape)?;
                 rewrite_tuple_pat(pat_vec, Some(path_str), self.span, context, shape)
             }
-            PatKind::Lit(ref expr) => expr.rewrite_result(context, shape),
+            PatKind::Expr(ref expr) => expr.rewrite_result(context, shape),
             PatKind::Slice(ref slice_pat)
                 if context.config.style_edition() <= StyleEdition::Edition2021 =>
             {
@@ -530,7 +530,7 @@ pub(crate) fn can_be_overflowed_pat(
             ast::PatKind::Ref(ref p, _) | ast::PatKind::Box(ref p) => {
                 can_be_overflowed_pat(context, &TuplePatField::Pat(p), len)
             }
-            ast::PatKind::Lit(ref expr) => can_be_overflowed_expr(context, expr, len),
+            ast::PatKind::Expr(ref expr) => can_be_overflowed_expr(context, expr, len),
             _ => false,
         },
         TuplePatField::Dotdot(..) => false,

tests/ui/macros/stringify.rs

@@ -569,7 +569,7 @@ fn test_pat() {
     c1!(pat, [ &pat ], "&pat");
     c1!(pat, [ &mut pat ], "&mut pat");
 
-    // PatKind::Lit
+    // PatKind::Expr
     c1!(pat, [ 1_000_i8 ], "1_000_i8");
 
     // PatKind::Range

tests/ui/pattern/patkind-litrange-no-expr.rs

@@ -6,7 +6,7 @@ macro_rules! enum_number {
 
         fn foo(value: i32) -> Option<$name> {
             match value {
-                $( $value => Some($name::$variant), )* // PatKind::Lit
+                $( $value => Some($name::$variant), )* // PatKind::Expr
                 $( $value ..= 42 => Some($name::$variant), )* // PatKind::Range
                 _ => None
             }

tests/ui/unpretty/expanded-exhaustive.rs

@@ -651,8 +651,8 @@ mod patterns {
         let &mut pat;
     }
 
-    /// PatKind::Lit
+    /// PatKind::Expr
-    fn pat_lit() {
+    fn pat_expr() {
         let 1_000_i8;
         let -"";
     }

tests/ui/unpretty/expanded-exhaustive.stdout

@@ -567,8 +567,8 @@ mod patterns {
     fn pat_deref() { let deref!(pat); }
     /// PatKind::Ref
     fn pat_ref() { let &pat; let &mut pat; }
-    /// PatKind::Lit
+    /// PatKind::Expr
-    fn pat_lit() { let 1_000_i8; let -""; }
+    fn pat_expr() { let 1_000_i8; let -""; }
     /// PatKind::Range
     fn pat_range() { let ..1; let 0..; let 0..1; let 0..=1; let -2..=-1; }
     /// PatKind::Slice

tests/ui/unpretty/unpretty-expr-fn-arg.stdout

@@ -14,4 +14,4 @@ extern crate std;
 
 fn main() ({ } as ())
 
-fn foo((-(128 as i8) as i8)...(127 as i8): i8) ({ } as ())
+fn foo(-128...127: i8) ({ } as ())