Get the rest of the shared tests for covariant to pass

pkg/analyzer/lib/src/generated/parser.dart

Index: pkg/analyzer/lib/src/generated/parser.dart
diff --git a/pkg/analyzer/lib/src/generated/parser.dart b/pkg/analyzer/lib/src/generated/parser.dart
index 6446cfad53ec3a25858d2b46660d4e0d7fb5b851..c90af7d69f56ef2dadcf1fe42d92585ec695d120 100644
--- a/pkg/analyzer/lib/src/generated/parser.dart
+++ b/pkg/analyzer/lib/src/generated/parser.dart
@@ -4143,7 +4143,15 @@ class Parser {
     Token covariantKeyword;
     CommentAndMetadata commentAndMetadata = parseCommentAndMetadata();
     if (_matchesKeyword(Keyword.COVARIANT)) {
-      covariantKeyword = getAndAdvance();
+      // Check to ensure that 'covariant' isn't being used as the parameter name.
+      Token next = _peek();
+      if (_tokenMatchesKeyword(next, Keyword.FINAL) ||
+          _tokenMatchesKeyword(next, Keyword.CONST) ||
+          _tokenMatchesKeyword(next, Keyword.VAR) ||
+          _tokenMatchesKeyword(next, Keyword.THIS) ||
+          _tokenMatchesIdentifier(next)) {
+        covariantKeyword = getAndAdvance();
+      }
     }
     FinalConstVarOrType holder = parseFinalConstVarOrType(!inFunctionType,
         inFunctionType: inFunctionType);
@@ -8332,6 +8340,10 @@ class Parser {
       _reportErrorForToken(
           ParserErrorCode.CONST_METHOD, modifiers.constKeyword);
     }
+    if (modifiers.covariantKeyword != null) {
+      _reportErrorForToken(
+          ParserErrorCode.COVARIANT_MEMBER, modifiers.covariantKeyword);
+    }
     if (modifiers.factoryKeyword != null) {
       _reportErrorForToken(
           ParserErrorCode.NON_CONSTRUCTOR_FACTORY, modifiers.factoryKeyword);