Fix p1

Author: abulgit

compiler/test/fail_compilation/enum_base_type.d

@@ -0,0 +1,17 @@
+/* TEST_OUTPUT:
+---
+fail_compilation/enum_base_type.d(16): Error: enum member `enum_base_type.A2.d` value cannot be automatically defined because the base type `A1` does not support increment
+---
+ */
+
+enum A1 : int
+{
+    a,
+    b,
+}
+
+enum A2 : A1
+{
+    c = A1.a, // explicitly set value OK
+    d, // error: cannot auto-increment enum type
+}