Un-xfail working test

Author: catamorphism

src/test/compile-fail/issue-2587-2.rs

@@ -1,8 +1,3 @@
-// xfail-fast
-// xfail-test
-
-// XFAIL'd due to problems with error messages on demoded Add.
-
 #[legacy_modes];
 
 fn foo<T: Copy>(+_t: T) { fail; }

src/test/compile-fail/omitted-arg-in-item-fn.rs

@@ -1,4 +1,2 @@
-// xfail-test
-
 fn foo(x) { //~ ERROR expected `:` but found `)`
 }