Fix another parser bug

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 839cf77b2fd6cb27c71a4166c7b41acbc7914bb2..d857f68d78925cc19fd32cb51448608d15767beb 100644
--- a/pkg/analyzer/lib/src/generated/parser.dart
+++ b/pkg/analyzer/lib/src/generated/parser.dart
@@ -542,8 +542,12 @@ class Parser {
       // There was no type name, so this can't be a declaration.
       return false;
     }
-    if (_tokenMatchesKeyword(token, Keyword.FUNCTION)) {
+    if (_atGenericFunctionTypeAfterReturnType(token)) {
       token = skipGenericFunctionTypeAfterReturnType(token);
+      if (token == null) {
+        // There was no type name, so this can't be a declaration.
+        return false;
+      }
     }
     if (token.type != TokenType.IDENTIFIER) {
       allowAdditionalTokens = false;