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diff --git a/src/test/ui/issues/issue-21174.stderr b/src/test/ui/issues/issue-21174.stderr
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@@ -0,0 +1,12 @@
+error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
+ --> $DIR/issue-21174.rs:7:30
+ |
+LL | let new: T::B = unsafe { std::mem::transmute(value) };
+ | ^^^^^^^^^^^^^^^^^^^
+ |
+ = note: source type: `<T as Trait>::A` (this type does not have a fixed size)
+ = note: target type: `<T as Trait>::B` (this type does not have a fixed size)
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0512`.