Improve the message for non_exhaustive_switch diagnostics

Fixes #60690

Change-Id: I1431d646a53c39b738369493b6a234df440dc2f0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/433100
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: bwilkerson

pkg/analyzer/lib/src/error/codes.g.dart

@@ -3971,8 +3971,8 @@ class CompileTimeErrorCode extends DiagnosticCode {
   static const CompileTimeErrorCode
   NON_EXHAUSTIVE_SWITCH_EXPRESSION = CompileTimeErrorCode(
     'NON_EXHAUSTIVE_SWITCH_EXPRESSION',
-    "The type '{0}' is not exhaustively matched by the switch cases since it "
-        "doesn't match '{1}'.",
+    "The type '{0}' isn't exhaustively matched by the switch cases since it "
+        "doesn't match the pattern '{1}'.",
     correctionMessage:
         "Try adding a wildcard pattern or cases that match '{2}'.",
     hasPublishedDocs: true,
@@ -3985,8 +3985,8 @@ class CompileTimeErrorCode extends DiagnosticCode {
   static const CompileTimeErrorCode
   NON_EXHAUSTIVE_SWITCH_STATEMENT = CompileTimeErrorCode(
     'NON_EXHAUSTIVE_SWITCH_STATEMENT',
-    "The type '{0}' is not exhaustively matched by the switch cases since it "
-        "doesn't match '{1}'.",
+    "The type '{0}' isn't exhaustively matched by the switch cases since it "
+        "doesn't match the pattern '{1}'.",
     correctionMessage: "Try adding a default case or cases that match '{2}'.",
     hasPublishedDocs: true,
   );

pkg/analyzer/messages.yaml

@@ -11873,7 +11873,7 @@ CompileTimeErrorCode:
       extension type A(void Function(String) f) {}
       ```
   NON_EXHAUSTIVE_SWITCH_EXPRESSION:
-    problemMessage: "The type '{0}' is not exhaustively matched by the switch cases since it doesn't match '{1}'."
+    problemMessage: "The type '{0}' isn't exhaustively matched by the switch cases since it doesn't match the pattern '{1}'."
     correctionMessage: "Try adding a wildcard pattern or cases that match '{2}'."
     hasPublishedDocs: true
     comment: |-
@@ -11934,7 +11934,7 @@ CompileTimeErrorCode:
       in the future. You will lose the ability to have the compiler warn you if
       the `switch` needs to be updated to account for newly added types.
   NON_EXHAUSTIVE_SWITCH_STATEMENT:
-    problemMessage: "The type '{0}' is not exhaustively matched by the switch cases since it doesn't match '{1}'."
+    problemMessage: "The type '{0}' isn't exhaustively matched by the switch cases since it doesn't match the pattern '{1}'."
     correctionMessage: "Try adding a default case or cases that match '{2}'."
     hasPublishedDocs: true
     comment: |-
@@ -18992,7 +18992,7 @@ FfiCode:
       external void leafCall(Pointer<Uint8> ptr);
 
       void main() {
-        final data = Uint8List(10); 
+        final data = Uint8List(10);
 
         // Correct: Using .address directly as an argument to a leaf call.
         leafCall(data.address);