Test where the old infrastructure failed to detect the (applicable) i…

…mpl of `FnMut` for

some reason.

src/test/compile-fail/issue-17033.rs

@@ -8,8 +8,10 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![feature(overloaded_calls)]
+
 fn f<'r>(p: &'r mut fn(p: &mut ())) {
-    p(()) //~ ERROR expected function, found `&'r mut fn(&mut ())`
+    p(()) //~ ERROR mismatched types: expected `&mut ()`, found `()`
 }
 
 fn main() {}