Attempt to instantiate an enum class is a compile-time error.

pkg/front_end/lib/src/fasta/kernel/body_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/body_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
index d0970fa01290df1405f4ab3b91221e2d39c0cbcb..f74807b037d0d2829f642bd79a40330c3d6edea2 100644
--- a/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/body_builder.dart
@@ -2151,6 +2151,11 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
 
       String errorName;
       if (type is ClassBuilder) {
+        if (type is EnumBuilder) {
+          push(buildCompileTimeError(
+              "An enum class can't be instantiated.", nameToken.charOffset));
+          return;
+        }
         Builder b =
             type.findConstructorOrFactory(name, token.charOffset, uri, library);
         Member target;