1 files changed, 32 insertions, 0 deletions

diff --git a/src/test/ui/impl-trait/issues/issue-62742.rs b/src/test/ui/impl-trait/issues/issue-62742.rs
new file mode 100644
index 000000000..041bd0e38
--- /dev/null
+++ b/src/test/ui/impl-trait/issues/issue-62742.rs
@@ -0,0 +1,32 @@
+use std::marker::PhantomData;
+
+fn _alias_check() {
+    WrongImpl::foo(0i32);
+    //~^ ERROR the trait bound `RawImpl<_>: Raw<_>` is not satisfied
+    WrongImpl::<()>::foo(0i32);
+    //~^ ERROR the trait bound `RawImpl<()>: Raw<()>` is not satisfied
+    //~| ERROR trait bounds were not satisfied
+    CorrectImpl::foo(0i32);
+}
+
+pub trait Raw<T: ?Sized> {
+    type Value;
+}
+
+pub type WrongImpl<T> = SafeImpl<T, RawImpl<T>>;
+
+pub type CorrectImpl<T> = SafeImpl<[T], RawImpl<T>>;
+
+pub struct RawImpl<T>(PhantomData<T>);
+
+impl<T> Raw<[T]> for RawImpl<T> {
+    type Value = T;
+}
+
+pub struct SafeImpl<T: ?Sized, A: Raw<T>>(PhantomData<(A, T)>);
+
+impl<T: ?Sized, A: Raw<T>> SafeImpl<T, A> {
+    pub fn foo(value: A::Value) {}
+}
+
+fn main() {}