add a three-argument version in the iter_any test, for good measure

tests/run-pass/iter_any.rs

 pub fn main() {
+    let f = |x: &u8| { 10u8 == *x };
+    f(&1u8);
+
     let g = |(), x: &u8| { 10u8 == *x };
     g((), &1u8);
 
-    let f = |x: &u8| { 10u8 == *x };
-    f(&1u8);
+    let h = |(), (), x: &u8| { 10u8 == *x };
+    h((), (), &1u8);
 
     [1, 2, 3u8].into_iter().any(|elt| 10 == *elt);
 }