Mark internal codes as never being displayed to users

Change-Id: I70b903059b37765c57bacf0f0402ec73e405fd4e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/229980
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
diff --git a/pkg/analyzer/lib/src/error/codes.g.dart b/pkg/analyzer/lib/src/error/codes.g.dart
index d3dc572..edeba68 100644
--- a/pkg/analyzer/lib/src/error/codes.g.dart
+++ b/pkg/analyzer/lib/src/error/codes.g.dart
@@ -8431,35 +8431,38 @@
 
   /**
    * 12.1 Constants: A constant expression is ... a constant list literal.
+   *
+   * Note: This diagnostic is never displayed to the user, so it doesn't need
+   * to be documented.
    */
   static const CompileTimeErrorCode MISSING_CONST_IN_LIST_LITERAL =
       CompileTimeErrorCode(
     'MISSING_CONST_IN_LIST_LITERAL',
-    "List literals must be prefixed with 'const' when used as a constant "
-        "expression.",
-    correctionMessage: "Try adding the keyword 'const' before the literal.",
+    "Seeing this message constitutes a bug. Please report it.",
   );
 
   /**
    * 12.1 Constants: A constant expression is ... a constant map literal.
+   *
+   * Note: This diagnostic is never displayed to the user, so it doesn't need
+   * to be documented.
    */
   static const CompileTimeErrorCode MISSING_CONST_IN_MAP_LITERAL =
       CompileTimeErrorCode(
     'MISSING_CONST_IN_MAP_LITERAL',
-    "Map literals must be prefixed with 'const' when used as a constant "
-        "expression.",
-    correctionMessage: "Try adding the keyword 'const' before the literal.",
+    "Seeing this message constitutes a bug. Please report it.",
   );
 
   /**
    * 12.1 Constants: A constant expression is ... a constant set literal.
+   *
+   * Note: This diagnostic is never displayed to the user, so it doesn't need
+   * to be documented.
    */
   static const CompileTimeErrorCode MISSING_CONST_IN_SET_LITERAL =
       CompileTimeErrorCode(
     'MISSING_CONST_IN_SET_LITERAL',
-    "Set literals must be prefixed with 'const' when used as a constant "
-        "expression.",
-    correctionMessage: "Try adding the keyword 'const' before the literal.",
+    "Seeing this message constitutes a bug. Please report it.",
   );
 
   /**
diff --git a/pkg/analyzer/messages.yaml b/pkg/analyzer/messages.yaml
index f3dcc6d..d791d4c 100644
--- a/pkg/analyzer/messages.yaml
+++ b/pkg/analyzer/messages.yaml
@@ -7304,17 +7304,26 @@
       var m = <String, int>{'a' : 2};
       ```
   MISSING_CONST_IN_LIST_LITERAL:
-    problemMessage: "List literals must be prefixed with 'const' when used as a constant expression."
-    correctionMessage: "Try adding the keyword 'const' before the literal."
-    comment: "12.1 Constants: A constant expression is ... a constant list literal."
+    problemMessage: Seeing this message constitutes a bug. Please report it.
+    comment: |-
+      12.1 Constants: A constant expression is ... a constant list literal.
+      
+      Note: This diagnostic is never displayed to the user, so it doesn't need
+      to be documented.
   MISSING_CONST_IN_MAP_LITERAL:
-    problemMessage: "Map literals must be prefixed with 'const' when used as a constant expression."
-    correctionMessage: "Try adding the keyword 'const' before the literal."
-    comment: "12.1 Constants: A constant expression is ... a constant map literal."
+    problemMessage: Seeing this message constitutes a bug. Please report it.
+    comment: |-
+      12.1 Constants: A constant expression is ... a constant map literal.
+
+      Note: This diagnostic is never displayed to the user, so it doesn't need
+      to be documented.
   MISSING_CONST_IN_SET_LITERAL:
-    problemMessage: "Set literals must be prefixed with 'const' when used as a constant expression."
-    correctionMessage: "Try adding the keyword 'const' before the literal."
-    comment: "12.1 Constants: A constant expression is ... a constant set literal."
+    problemMessage: Seeing this message constitutes a bug. Please report it.
+    comment: |-
+      12.1 Constants: A constant expression is ... a constant set literal.
+
+      Note: This diagnostic is never displayed to the user, so it doesn't need
+      to be documented.
   MISSING_DART_LIBRARY:
     problemMessage: "Required library '{0}' is missing."
     correctionMessage: Re-install the Dart or Flutter SDK.