add guard pattern AST node

compiler/rustc_ast/src/ast.rs

@@ -632,9 +632,11 @@ impl Pat {
             | PatKind::Or(s) => s.iter().for_each(|p| p.walk(it)),
 
             // Trivial wrappers over inner patterns.
-            PatKind::Box(s) | PatKind::Deref(s) | PatKind::Ref(s, _) | PatKind::Paren(s) => {
+            PatKind::Box(s)
-                s.walk(it)
+            | PatKind::Deref(s)
-            }
+            | PatKind::Ref(s, _)
+            | PatKind::Paren(s)
+            | PatKind::Guard(s, _) => s.walk(it),
 
             // These patterns do not contain subpatterns, skip.
             PatKind::Wild
@@ -844,6 +846,9 @@ pub enum PatKind {
     // A never pattern `!`.
     Never,
 
+    /// A guard pattern (e.g., `x if guard(x)`).
+    Guard(P<Pat>, P<Expr>),
+
     /// Parentheses in patterns used for grouping (i.e., `(PAT)`).
     Paren(P<Pat>),
 

compiler/rustc_ast/src/mut_visit.rs

@@ -1520,6 +1520,10 @@ pub fn walk_pat<T: MutVisitor>(vis: &mut T, pat: &mut P<Pat>) {
             visit_opt(e2, |e| vis.visit_expr(e));
             vis.visit_span(span);
         }
+        PatKind::Guard(p, e) => {
+            vis.visit_pat(p);
+            vis.visit_expr(e);
+        }
         PatKind::Tuple(elems) | PatKind::Slice(elems) | PatKind::Or(elems) => {
             visit_thin_vec(elems, |elem| vis.visit_pat(elem))
         }

compiler/rustc_ast/src/visit.rs

@@ -679,6 +679,10 @@ pub fn walk_pat<'a, V: Visitor<'a>>(visitor: &mut V, pattern: &'a Pat) -> V::Res
             visit_opt!(visitor, visit_expr, lower_bound);
             visit_opt!(visitor, visit_expr, upper_bound);
         }
+        PatKind::Guard(subpattern, guard_condition) => {
+            try_visit!(visitor.visit_pat(subpattern));
+            try_visit!(visitor.visit_expr(guard_condition));
+        }
         PatKind::Wild | PatKind::Rest | PatKind::Never => {}
         PatKind::Err(_guar) => {}
         PatKind::Tuple(elems) | PatKind::Slice(elems) | PatKind::Or(elems) => {

compiler/rustc_ast_lowering/src/pat.rs

@@ -114,6 +114,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             self.lower_range_end(end, e2.is_some()),
                         );
                     }
+                    // FIXME(guard_patterns): lower pattern guards to HIR
+                    PatKind::Guard(inner, _) => pattern = inner,
                     PatKind::Slice(pats) => break self.lower_pat_slice(pats),
                     PatKind::Rest => {
                         // If we reach here the `..` pattern is not semantically allowed.

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -1709,6 +1709,12 @@ impl<'a> State<'a> {
                     self.print_expr(e, FixupContext::default());
                 }
             }
+            PatKind::Guard(subpat, condition) => {
+                self.print_pat(subpat);
+                self.space();
+                self.word_space("if");
+                self.print_expr(condition, FixupContext::default());
+            }
             PatKind::Slice(elts) => {
                 self.word("[");
                 self.commasep(Inconsistent, elts, |s, p| s.print_pat(p));

compiler/rustc_lint/src/unused.rs

@@ -1235,7 +1235,7 @@ impl EarlyLintPass for UnusedParens {
                 self.check_unused_parens_pat(cx, &f.pat, false, false, keep_space);
             },
             // Avoid linting on `i @ (p0 | .. | pn)` and `box (p0 | .. | pn)`, #64106.
-            Ident(.., Some(p)) | Box(p) | Deref(p) => self.check_unused_parens_pat(cx, p, true, false, keep_space),
+            Ident(.., Some(p)) | Box(p) | Deref(p) | Guard(p, _) => self.check_unused_parens_pat(cx, p, true, false, keep_space),
             // Avoid linting on `&(mut x)` as `&mut x` has a different meaning, #55342.
             // Also avoid linting on `& mut? (p0 | .. | pn)`, #64106.
             Ref(p, m) => self.check_unused_parens_pat(cx, p, true, *m == Mutability::Not, keep_space),

compiler/rustc_passes/src/input_stats.rs

@@ -556,6 +556,7 @@ impl<'v> ast_visit::Visitor<'v> for StatCollector<'v> {
             Slice,
             Rest,
             Never,
+            Guard,
             Paren,
             MacCall,
             Err