Add test for issue-57201

Author: JohnTitor

src/test/ui/impl-trait/issue-57201.rs

@@ -0,0 +1,14 @@
+// Regression test for #57201
+
+#![feature(impl_trait_in_bindings)]
+#![allow(incomplete_features)]
+
+fn bug<'a, 'b, T>()
+where
+    'a: 'b,
+{
+    let f: &impl Fn(&'a T) -> &'b T = &|x| x;
+    //~^ ERROR: lifetimes in impl Trait types in bindings are not currently supported
+}
+
+fn main() {}

src/test/ui/impl-trait/issue-57201.stderr

@@ -0,0 +1,8 @@
+error: lifetimes in impl Trait types in bindings are not currently supported
+  --> $DIR/issue-57201.rs:10:13
+   |
+LL |     let f: &impl Fn(&'a T) -> &'b T = &|x| x;
+   |             ^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+