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-rw-r--r--src/librustc_trans/trans/context.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_trans/trans/context.rs b/src/librustc_trans/trans/context.rs
index bd13667ac08..7f383f568a0 100644
--- a/src/librustc_trans/trans/context.rs
+++ b/src/librustc_trans/trans/context.rs
@@ -566,7 +566,7 @@ impl<'b, 'tcx> CrateContext<'b, 'tcx> {
         }
         match declare_intrinsic(self, key) {
             Some(v) => return v,
-            None => panic!()
+            None => panic!("unknown intrinsic '{}'", key)
         }
     }