Normalize field before checking PhantomData in coerce/dispatch impl validation

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/ui/self/phantomdata-in-coerce-and-dispatch-impls.rs b/tests/ui/self/phantomdata-in-coerce-and-dispatch-impls.rs
new file mode 100644
index 00000000000..9c7e33830f5
--- /dev/null
+++ b/tests/ui/self/phantomdata-in-coerce-and-dispatch-impls.rs
@@ -0,0 +1,25 @@
+//@ check-pass
+
+#![feature(coerce_unsized, dispatch_from_dyn, unsize)]
+
+use std::marker::Unsize;
+use std::ops::{CoerceUnsized, DispatchFromDyn};
+use std::marker::PhantomData;
+
+trait Mirror {
+    type Assoc;
+}
+impl<T> Mirror for T {
+    type Assoc = T;
+}
+
+struct W<T: 'static> {
+    t: &'static T,
+    f: <PhantomData<T> as Mirror>::Assoc,
+}
+
+impl<T, U> CoerceUnsized<W<U>> for W<T> where T: Unsize<U> {}
+
+impl<T, U> DispatchFromDyn<W<U>> for W<T> where T: Unsize<U> {}
+
+fn main() {}