Try to fix pretty-test breakage harder.

Author: graydon

src/test/pretty/record-trailing-comma.rs

@@ -3,6 +3,6 @@ type thing = {x: int, y: int,};
 
 fn main() {
     let sth = {x: 0, y: 1,};
-    let sth2 = {y: 9 .. sth};
+    let sth2 = {y: 9 ..sth};
     assert sth.x + sth2.y == 9;
 }