future compat implications

src/test/ui/wf/higher-ranked/ignored-trait-bound.rs

@@ -0,0 +1,19 @@
+// check-pass
+struct NeedsCopy<T: Copy>(T);
+
+// Skips WF because of an escaping bound region.
+struct HasWfHigherRanked
+where
+    (for<'a> fn(NeedsCopy<&'a mut u32>)):,
+{}
+
+// Skips WF because of a placeholder region.
+struct HasWfPlaceholder
+where
+    for<'a> NeedsCopy<&'a mut u32>:,
+{}
+
+fn main() {
+    let _: HasWfHigherRanked;
+    let _: HasWfPlaceholder;
+}