From 899aae465eb4ef295dc1eeb2603f744568e0768c Mon Sep 17 00:00:00 2001
From: Seo Sanghyeon <sanxiyn@gmail.com>
Date: Fri, 29 Jan 2021 01:44:15 +0900
Subject: [PATCH] Simplify base_expr

Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de>
---
 compiler/rustc_passes/src/dead.rs | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/compiler/rustc_passes/src/dead.rs b/compiler/rustc_passes/src/dead.rs
index a4798b9ae1f0c..3902557e9b52c 100644
--- a/compiler/rustc_passes/src/dead.rs
+++ b/compiler/rustc_passes/src/dead.rs
@@ -37,17 +37,13 @@ fn should_explore(tcx: TyCtxt<'_>, hir_id: hir::HirId) -> bool {
     )
 }
 
-fn base_expr<'a>(expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a> {
-    let mut current = expr;
+fn base_expr<'a>(mut expr: &'a hir::Expr<'a>) -> &'a hir::Expr<'a>
     loop {
-        match current.kind {
-            hir::ExprKind::Field(base, ..) => {
-                current = base;
-            }
-            _ => break,
+        match expr.kind {
+            hir::ExprKind::Field(base, ..) => expr = base,
+            _ => return expr,
         }
     }
-    current
 }
 
 struct MarkSymbolVisitor<'tcx> {