Fix type analysis of the keyword "dynamic".

pkg/analyzer/test/generated/static_type_warning_code_test.dart

Index: pkg/analyzer/test/generated/static_type_warning_code_test.dart
diff --git a/pkg/analyzer/test/generated/static_type_warning_code_test.dart b/pkg/analyzer/test/generated/static_type_warning_code_test.dart
index 67ec5def82405128ec783ab1bdd5f40d20cc4bee..02c588b1e947f7c0a159d61c7585d73723426cb3 100644
--- a/pkg/analyzer/test/generated/static_type_warning_code_test.dart
+++ b/pkg/analyzer/test/generated/static_type_warning_code_test.dart
@@ -220,6 +220,17 @@ f([String x = 0]) {
     verify([source]);
   }
 
+  void test_invalidAssignment_dynamic() {
+    Source source = addSource(r'''
+main() {
+  dynamic = 1;
+}
+''');
+    resolve(source);
+    assertErrors(source, [StaticTypeWarningCode.INVALID_ASSIGNMENT]);
+    verify([source]);
+  }
+
   void test_invalidAssignment_instanceVariable() {
     Source source = addSource(r'''
 class A {