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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-26905.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-26905.rs b/src/test/ui/issues/issue-26905.rs new file mode 100644 index 000000000..4c5c67d58 --- /dev/null +++ b/src/test/ui/issues/issue-26905.rs @@ -0,0 +1,23 @@ +#![feature(unsize, coerce_unsized)] + +// Verfies that non-PhantomData ZSTs still cause coercions to fail. +// They might have additional semantics that we don't want to bulldoze. + +use std::marker::{Unsize, PhantomData}; +use std::ops::CoerceUnsized; + +struct NotPhantomData<T: ?Sized>(PhantomData<T>); + +struct MyRc<T: ?Sized> { + _ptr: *const T, + _boo: NotPhantomData<T>, +} + +impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<MyRc<U>> for MyRc<T>{ } //~ERROR + +fn main() { + let data = [1, 2, 3]; + let iter = data.iter(); + let x = MyRc { _ptr: &iter, _boo: NotPhantomData(PhantomData) }; + let _y: MyRc<dyn Iterator<Item=&u32>> = x; +} |