diff options
Diffstat (limited to 'src/test/ui/unsized/issue-97732.rs')
-rw-r--r-- | src/test/ui/unsized/issue-97732.rs | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/test/ui/unsized/issue-97732.rs b/src/test/ui/unsized/issue-97732.rs new file mode 100644 index 000000000..72f765033 --- /dev/null +++ b/src/test/ui/unsized/issue-97732.rs @@ -0,0 +1,28 @@ +// check-pass + +#![feature(coerce_unsized)] + +// Ensure that unsizing structs that contain ZSTs at non-zero offsets don't ICE + +use std::ops::CoerceUnsized; + +#[repr(C)] +pub struct BoxWithZstTail<T: ?Sized>(Box<T>, ()); + +impl<S: ?Sized, T: ?Sized> CoerceUnsized<BoxWithZstTail<T>> for BoxWithZstTail<S> where + Box<S>: CoerceUnsized<Box<T>> +{ +} + +pub fn noop_dyn_upcast_with_zst_tail( + b: BoxWithZstTail<dyn ToString + Send>, +) -> BoxWithZstTail<dyn ToString> { + b +} + +fn main() { + let original = "foo"; + let boxed = BoxWithZstTail(Box::new(original) as Box<dyn ToString + Send>, ()); + let noop_upcasted = noop_dyn_upcast_with_zst_tail(boxed); + assert_eq!(original, noop_upcasted.0.to_string()); +} |