Fix reversed current/expected type

Fix some reversed type of arm pattern and type of search pattern
in error message.

src/test/compile-fail/match-struct.rs

@@ -1,11 +1,10 @@
-// error-pattern: mismatched types
 
 struct S { a: int }
 enum E { C(int) }
 
 fn main() {
     match S { a: 1 } {
-        C(_) => (),
+        C(_) => (), //~ ERROR mismatched types: expected `S` but found `E`
         _ => ()
     }
 }