Add troublesome statement with semi-colon to teset

Author: varkor

src/test/ui/while-label-break-condition.rs

@@ -8,6 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#![allow(unreachable_code)]
+
 fn main() {
     'a: while break 'a {} //~ ERROR: use of undeclared label
+    'b: while break 'b {}; //~ ERROR: use of undeclared label
 }

src/test/ui/while-label-break-condition.stderr

@@ -1,9 +1,15 @@
 error[E0426]: use of undeclared label `'a`
-  --> $DIR/while-label-break-condition.rs:12:21
+  --> $DIR/while-label-break-condition.rs:14:21
    |
 LL |     'a: while break 'a {} //~ ERROR: use of undeclared label
    |                     ^^ undeclared label `'a`
 
-error: aborting due to previous error
+error[E0426]: use of undeclared label `'b`
+  --> $DIR/while-label-break-condition.rs:15:21
+   |
+LL |     'b: while break 'b {}; //~ ERROR: use of undeclared label
+   |                     ^^ undeclared label `'b`
+
+error: aborting due to 2 previous errors
 
 For more information about this error, try `rustc --explain E0426`.