Convert ret to return

src/test/run-pass/unreachable-code.rs

@@ -7,23 +7,23 @@ fn call_id() {
     id(c);
 }
 
-fn call_id_2() { id(true) && id(ret); }
+fn call_id_2() { id(true) && id(return); }
 
-fn call_id_3() { id(ret) && id(ret); }
+fn call_id_3() { id(return) && id(return); }
 
 fn log_fail() { log(error, fail); }
 
-fn log_ret() { log(error, ret); }
+fn log_ret() { log(error, return); }
 
 fn log_break() { loop { log(error, break); } }
 
 fn log_again() { loop { log(error, again); } }
 
-fn ret_ret() -> int { ret (ret 2) + 3; }
+fn ret_ret() -> int { return (return 2) + 3; }
 
 fn ret_guard() {
     alt 2 {
-      x if (ret) { x; }
+      x if (return) { x; }
       _ {}
     }
 }