Add test for #110557

tests/ui/traits/non_lifetime_binders/drop-impl-pred.no.stderr

@@ -0,0 +1,24 @@
+warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/drop-impl-pred.rs:6:12
+   |
+LL | #![feature(non_lifetime_binders)]
+   |            ^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0367]: `Drop` impl requires `H: Foo` but the struct it is implemented for does not
+  --> $DIR/drop-impl-pred.rs:19:15
+   |
+LL |     for<H> H: Foo,
+   |               ^^^
+   |
+note: the implementor must specify the same requirement
+  --> $DIR/drop-impl-pred.rs:12:1
+   |
+LL | struct Bar<T>(T) where T: Foo;
+   | ^^^^^^^^^^^^^
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0367`.

tests/ui/traits/non_lifetime_binders/drop-impl-pred.rs

@@ -0,0 +1,25 @@
+// revisions: no yes
+//[yes] check-pass
+
+// Issue 110557
+
+#![feature(non_lifetime_binders)]
+//~^ WARN the feature `non_lifetime_binders` is incomplete
+
+pub trait Foo {}
+
+#[cfg(no)]
+struct Bar<T>(T) where T: Foo;
+
+#[cfg(yes)]
+struct Bar<T>(T) where for<H> H: Foo;
+
+impl<T> Drop for Bar<T>
+where
+    for<H> H: Foo,
+//[no]~^ ERROR `Drop` impl requires `H: Foo` but the struct it is implemented for does not
+{
+    fn drop(&mut self) {}
+}
+
+fn main() {}

tests/ui/traits/non_lifetime_binders/drop-impl-pred.yes.stderr

@@ -0,0 +1,11 @@
+warning: the feature `non_lifetime_binders` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/drop-impl-pred.rs:6:12
+   |
+LL | #![feature(non_lifetime_binders)]
+   |            ^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #108185 <https://github.com/rust-lang/rust/issues/108185> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+