Use a label for catch-all pattern instead of note

src/librustc_const_eval/check_match.rs

@@ -403,7 +403,7 @@ fn check_arms<'a, 'tcx>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
                             // if we had a catchall pattern, hint at that
                             if let Some(catchall) = catchall {
                                 err.span_label(pat.span, "this is an unreachable pattern");
-                                err.span_note(catchall, "this pattern matches any value");
+                                err.span_label(catchall, "this pattern matches any value");
                             }
                             err.emit();
                         },

src/test/ui/issue-30302.stderr

@@ -9,6 +9,9 @@ warning[E0170]: pattern binding `Nil` is named the same as one of the variants o
 error: unreachable pattern
   --> $DIR/issue-30302.rs:25:9
    |
+23 |         Nil => true,
+   |         --- this pattern matches any value
+24 | //~^ WARN pattern binding `Nil` is named the same as one of the variants of the type `Stack`
 25 |         _ => false
    |         ^ this is an unreachable pattern
    |
@@ -17,11 +20,6 @@ note: lint level defined here
    |
 14 | #![deny(unreachable_patterns)]
    |         ^^^^^^^^^^^^^^^^^^^^
-note: this pattern matches any value
-  --> $DIR/issue-30302.rs:23:9
-   |
-23 |         Nil => true,
-   |         ^^^
 
 error: aborting due to previous error
 

src/test/ui/issue-31221.stderr

@@ -1,6 +1,8 @@
 error: unreachable pattern
   --> $DIR/issue-31221.rs:28:9
    |
+27 |         Var3 => (),
+   |         ---- this pattern matches any value
 28 |         Var2 => (),
    |         ^^^^ this is an unreachable pattern
    |
@@ -9,35 +11,24 @@ note: lint level defined here
    |
 14 | #![deny(unreachable_patterns)]
    |         ^^^^^^^^^^^^^^^^^^^^
-note: this pattern matches any value
-  --> $DIR/issue-31221.rs:27:9
-   |
-27 |         Var3 => (),
-   |         ^^^^
 
 error: unreachable pattern
   --> $DIR/issue-31221.rs:34:9
    |
+33 |         &Var3 => (),
+   |         ----- this pattern matches any value
 34 |         &Var2 => (),
    |         ^^^^^ this is an unreachable pattern
    |
-note: this pattern matches any value
-  --> $DIR/issue-31221.rs:33:9
-   |
-33 |         &Var3 => (),
-   |         ^^^^^
 
 error: unreachable pattern
   --> $DIR/issue-31221.rs:41:9
    |
+40 |         (c, d) => (),
+   |         ------ this pattern matches any value
 41 |         anything => ()
    |         ^^^^^^^^ this is an unreachable pattern
    |
-note: this pattern matches any value
-  --> $DIR/issue-31221.rs:40:9
-   |
-40 |         (c, d) => (),
-   |         ^^^^^^
 
 error: aborting due to 3 previous errors