Rollup merge of #119554 - matthewjasper:remove-guard-distinction, r=compiler-errors

Fix scoping for let chains in match guards

If let guards were previously represented as a different type of guard in HIR and THIR. This meant that let chains in match guards were not handled correctly because they were treated exactly like normal guards.

- Remove `hir::Guard` and `thir::Guard`.
- Make the scoping different between normal guards and if let guards also check for let chains.

closes #118593

compiler/rustc_middle/src/thir.rs

@@ -519,20 +519,13 @@ pub struct FruInfo<'tcx> {
 #[derive(Clone, Debug, HashStable)]
 pub struct Arm<'tcx> {
     pub pattern: Box<Pat<'tcx>>,
-    pub guard: Option<Guard<'tcx>>,
+    pub guard: Option<ExprId>,
     pub body: ExprId,
     pub lint_level: LintLevel,
     pub scope: region::Scope,
     pub span: Span,
 }
 
-/// A `match` guard.
-#[derive(Clone, Debug, HashStable)]
-pub enum Guard<'tcx> {
-    If(ExprId),
-    IfLet(Box<Pat<'tcx>>, ExprId),
-}
-
 #[derive(Copy, Clone, Debug, HashStable)]
 pub enum LogicalOp {
     /// The `&&` operator.

compiler/rustc_middle/src/thir/visit.rs

@@ -1,5 +1,5 @@
 use super::{
-    AdtExpr, Arm, Block, ClosureExpr, Expr, ExprKind, Guard, InlineAsmExpr, InlineAsmOperand, Pat,
+    AdtExpr, Arm, Block, ClosureExpr, Expr, ExprKind, InlineAsmExpr, InlineAsmOperand, Pat,
     PatKind, Stmt, StmtKind, Thir,
 };
 
@@ -213,13 +213,8 @@ pub fn walk_arm<'thir, 'tcx: 'thir, V: Visitor<'thir, 'tcx>>(
     visitor: &mut V,
     arm: &'thir Arm<'tcx>,
 ) {
-    match arm.guard {
-        Some(Guard::If(expr)) => visitor.visit_expr(&visitor.thir()[expr]),
-        Some(Guard::IfLet(ref pat, expr)) => {
-            visitor.visit_pat(pat);
-            visitor.visit_expr(&visitor.thir()[expr]);
-        }
-        None => {}
+    if let Some(expr) = arm.guard {
+        visitor.visit_expr(&visitor.thir()[expr])
     }
     visitor.visit_pat(&arm.pattern);
     visitor.visit_expr(&visitor.thir()[arm.body]);