From c07890543d13b36180dfbc0b6b6632c2c1dfff3f Mon Sep 17 00:00:00 2001
From: LingMan <LingMan@users.noreply.github.com>
Date: Wed, 23 Sep 2020 00:29:56 +0200
Subject: [PATCH] Don't use an if guard to check equality with a constant

Match on it directly instead
---
 compiler/rustc_attr/src/builtin.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compiler/rustc_attr/src/builtin.rs b/compiler/rustc_attr/src/builtin.rs
index 9951c252001..1808eb270ba 100644
--- a/compiler/rustc_attr/src/builtin.rs
+++ b/compiler/rustc_attr/src/builtin.rs
@@ -301,7 +301,7 @@ where
                                                 .emit();
                                             };
                                             match issue.parse() {
-                                                Ok(num) if num == 0 => {
+                                                Ok(0) => {
                                                     emit_diag(
                                                         "`issue` must not be \"0\", \
                                                         use \"none\" instead",