Enable a test for .. in range patterns.

Author: nrc

src/test/compile-fail/pat-range-bad-dots.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// ignore-test
-
 pub fn main() {
     match 22i {
         0 .. 3 => {} //~ ERROR expected `=>`, found `..`