tests: add regression test for stage2 ICE

Author: davidtwco

tests/ui/sized-hierarchy/bound-on-assoc-type-projection-1.rs

@@ -0,0 +1,19 @@
+//@ check-pass
+//@ compile-flags: --crate-type=lib
+
+use std::marker::PhantomData;
+
+pub trait ZeroMapKV<'a> {
+    type Container;
+}
+
+pub trait ZeroFrom<'zf, C: ?Sized> {}
+
+pub struct ZeroMap<'a, K: ZeroMapKV<'a>>(PhantomData<&'a K>);
+
+impl<'zf, 's, K> ZeroFrom<'zf, ZeroMap<'s, K>> for ZeroMap<'zf, K>
+where
+    K: for<'b> ZeroMapKV<'b>,
+    <K as ZeroMapKV<'zf>>::Container: ZeroFrom<'zf, <K as ZeroMapKV<'s>>::Container>,
+{
+}