From ab821aed0c048964a86285d534ca93203d61af89 Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Tue, 2 Apr 2024 19:30:32 -0400
Subject: [PATCH] Fix precedence of postfix match

---
 compiler/rustc_ast/src/ast.rs         | 3 ++-
 compiler/rustc_ast/src/util/parser.rs | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/compiler/rustc_ast/src/ast.rs b/compiler/rustc_ast/src/ast.rs
index aba94f4d817..ccbcd5091b4 100644
--- a/compiler/rustc_ast/src/ast.rs
+++ b/compiler/rustc_ast/src/ast.rs
@@ -1276,7 +1276,8 @@ pub fn precedence(&self) -> ExprPrecedence {
             ExprKind::While(..) => ExprPrecedence::While,
             ExprKind::ForLoop { .. } => ExprPrecedence::ForLoop,
             ExprKind::Loop(..) => ExprPrecedence::Loop,
-            ExprKind::Match(..) => ExprPrecedence::Match,
+            ExprKind::Match(_, _, MatchKind::Prefix) => ExprPrecedence::Match,
+            ExprKind::Match(_, _, MatchKind::Postfix) => ExprPrecedence::PostfixMatch,
             ExprKind::Closure(..) => ExprPrecedence::Closure,
             ExprKind::Block(..) => ExprPrecedence::Block,
             ExprKind::TryBlock(..) => ExprPrecedence::TryBlock,
diff --git a/compiler/rustc_ast/src/util/parser.rs b/compiler/rustc_ast/src/util/parser.rs
index 13768c12017..544db992f4f 100644
--- a/compiler/rustc_ast/src/util/parser.rs
+++ b/compiler/rustc_ast/src/util/parser.rs
@@ -281,6 +281,7 @@ pub enum ExprPrecedence {
     ForLoop,
     Loop,
     Match,
+    PostfixMatch,
     ConstBlock,
     Block,
     TryBlock,
@@ -334,7 +335,8 @@ pub fn order(self) -> i8 {
             | ExprPrecedence::InlineAsm
             | ExprPrecedence::Mac
             | ExprPrecedence::FormatArgs
-            | ExprPrecedence::OffsetOf => PREC_POSTFIX,
+            | ExprPrecedence::OffsetOf
+            | ExprPrecedence::PostfixMatch => PREC_POSTFIX,
 
             // Never need parens
             ExprPrecedence::Array