Fix existing test

src/test/ui/issue-2354.rs

@@ -10,11 +10,13 @@
 
 // compile-flags: -Z parse-only
 
-fn foo() { //~ HELP did you mean to close this delimiter?
+fn foo() { //~ NOTE un-closed delimiter
   match Some(x) {
+  //~^ NOTE this might be the culprit...
       Some(y) => { panic!(); }
       None => { panic!(); }
 }
+//~^ NOTE ...as it matches this but it has different indentation
 
 fn bar() {
     let mut i = 0;

src/test/ui/issue-2354.stderr

@@ -0,0 +1,16 @@
+error: this file contains an un-closed delimiter
+  --> $DIR/issue-2354.rs:26:66
+   |
+LL | fn foo() { //~ NOTE un-closed delimiter
+   |          - un-closed delimiter
+LL |   match Some(x) {
+   |                 - this might be the culprit...
+...
+LL | }
+   | - ...as it matches this but it has different indentation
+...
+LL | fn main() {} //~ ERROR this file contains an un-closed delimiter
+   |                                                                  ^
+
+error: aborting due to previous error
+