add test for ICE fix

Author: aliemjay

tests/ui/type-alias-impl-trait/outlives-bound-var.rs

@@ -0,0 +1,18 @@
+// Here we process outlive obligations involving
+// opaque types with bound vars in substs.
+// This was an ICE.
+//
+// check-pass
+#![feature(type_alias_impl_trait)]
+
+type Ty<'a> = impl Sized + 'a;
+fn define<'a>() -> Ty<'a> {}
+
+// Ty<'^0>: 'static
+fn test1(_: &'static fn(Ty<'_>)) {}
+
+fn test2() {
+    None::<&fn(Ty<'_>)>;
+}
+
+fn main() { }