Adjust `transmute{,_copy}` to be clearer about which of `T` and `U` is input vs output

1 files changed, 5 insertions, 1 deletions

diff --git a/library/core/tests/mem.rs b/library/core/tests/mem.rs
index b0cc08a15f0..0362e1c8afb 100644
--- a/library/core/tests/mem.rs
+++ b/library/core/tests/mem.rs
@@ -130,7 +130,11 @@ fn test_transmute_copy_grow_panics() {
             payload
                 .downcast::<&'static str>()
                 .and_then(|s| {
-                    if *s == "cannot transmute_copy if U is larger than T" { Ok(s) } else { Err(s) }
+                    if *s == "cannot transmute_copy if Dst is larger than Src" {
+                        Ok(s)
+                    } else {
+                        Err(s)
+                    }
                 })
                 .unwrap_or_else(|p| panic::resume_unwind(p));
         }