Rollup merge of #117373 - saethlin:avoid-ice-lint, r=compiler-errors

Avoid the path trimming ICE lint in error reporting

Types or really anything in MIR should never be formatted without path trimming disabled, because its formatting often tries to construct trimmed paths. In this case, the lint turns a nice error report into an irrelevant ICE.

1 files changed, 4 insertions, 8 deletions

diff --git a/compiler/rustc_const_eval/src/interpret/cast.rs b/compiler/rustc_const_eval/src/interpret/cast.rs
index 8fc0205d6c7..f4cb12c8d43 100644
--- a/compiler/rustc_const_eval/src/interpret/cast.rs
+++ b/compiler/rustc_const_eval/src/interpret/cast.rs
@@ -145,16 +145,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 assert!(dest.layout.is_sized());
                 assert_eq!(cast_ty, dest.layout.ty); // we otherwise ignore `cast_ty` enirely...
                 if src.layout.size != dest.layout.size {
-                    let src_bytes = src.layout.size.bytes();
-                    let dest_bytes = dest.layout.size.bytes();
-                    let src_ty = format!("{}", src.layout.ty);
-                    let dest_ty = format!("{}", dest.layout.ty);
                     throw_ub_custom!(
                         fluent::const_eval_invalid_transmute,
-                        src_bytes = src_bytes,
-                        dest_bytes = dest_bytes,
-                        src = src_ty,
-                        dest = dest_ty,
+                        src_bytes = src.layout.size.bytes(),
+                        dest_bytes = dest.layout.size.bytes(),
+                        src = src.layout.ty,
+                        dest = dest.layout.ty,
                     );
                 }