From 868a8ea2d94a705e709dc77a6803cee05ed3d5e4 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Sun, 19 Jun 2022 18:08:19 -0700
Subject: [PATCH] Restore compatibility with rustc older than 1.33

    error[E0658]: multiple patterns in `if let` and `while let` are unstable (see issue #48215)
       --> src/fallback.rs:704:9
        |
    704 | /         if let "" | "_" | "super" | "self" | "Self" | "crate" | "$crate" | "{{root}}" = string {
    705 | |             panic!("`{}` cannot be a raw identifier", string);
    706 | |         }
        | |_________^
---
 src/fallback.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/fallback.rs b/src/fallback.rs
index 8567a13b..fecc9b3e 100644
--- a/src/fallback.rs
+++ b/src/fallback.rs
@@ -701,8 +701,11 @@ fn validate_ident(string: &str, raw: bool) {
     }
 
     if raw {
-        if let "" | "_" | "super" | "self" | "Self" | "crate" | "$crate" | "{{root}}" = string {
-            panic!("`{}` cannot be a raw identifier", string);
+        match string {
+            "" | "_" | "super" | "self" | "Self" | "crate" | "$crate" | "{{root}}" => {
+                panic!("`{}` cannot be a raw identifier", string);
+            }
+            _ => {}
         }
     }
 }