From 947a09a4a88f97aa0ab59a5d21afd8ca3d429e60 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Tue, 18 Jan 2022 19:18:47 -0800
Subject: [PATCH] Replace `if` + `unwrap` with `if let` in check_stack

---
 compiler/rustc_ast_pretty/src/pp.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/compiler/rustc_ast_pretty/src/pp.rs b/compiler/rustc_ast_pretty/src/pp.rs
index 8d58eaa82a7..b2870ac2734 100644
--- a/compiler/rustc_ast_pretty/src/pp.rs
+++ b/compiler/rustc_ast_pretty/src/pp.rs
@@ -379,8 +379,7 @@ impl Printer {
     }
 
     fn check_stack(&mut self, k: usize) {
-        if !self.scan_stack.is_empty() {
-            let x = *self.scan_stack.front().unwrap();
+        if let Some(&x) = self.scan_stack.front() {
             match self.buf[x].token {
                 Token::Begin(_) => {
                     if k > 0 {