From c6e6ceb078f57519bf246eba791dc20aa007948a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= <matthias.krueger@famsik.de>
Date: Sun, 25 Jun 2023 23:16:00 +0200
Subject: [PATCH] make custom mir ICE a bit nicer

---
 compiler/rustc_mir_build/src/build/custom/mod.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_mir_build/src/build/custom/mod.rs b/compiler/rustc_mir_build/src/build/custom/mod.rs
index 32c618828c9..e5c2cc6c7bb 100644
--- a/compiler/rustc_mir_build/src/build/custom/mod.rs
+++ b/compiler/rustc_mir_build/src/build/custom/mod.rs
@@ -118,7 +118,11 @@ fn parse_attribute(attr: &Attribute) -> MirPhase {
                 phase = Some(value);
             }
             other => {
-                panic!("Unexpected key {}", other);
+                span_bug!(
+                    nested.span(),
+                    "Unexpected key while parsing custom_mir attribute: '{}'",
+                    other
+                );
             }
         }
     }