Commit 028ec0f2c3

@@ -2393,7 +2393,7 @@ static void resolve_enum_zero_bits(CodeGen *g, TypeTableEntry *enum_type) {
     }
 
     enum_type->data.enumeration.zero_bits_loop_flag = false;
-    enum_type->zero_bits = (field_count < 2);
+    enum_type->zero_bits = !type_has_bits(tag_int_type);
     enum_type->data.enumeration.zero_bits_known = true;
 }
 

@@ -387,3 +387,8 @@ const EnumWithTagValues = enum(u4) {
 test "enum with tag values don't require parens" {
     assert(u4(EnumWithTagValues.C) == 0b0100);
 }
+
+test "enum with 1 field but explicit tag type should still have the tag type" {
+    const Enum = enum(u8) { B = 2 };
+    comptime @import("std").debug.assert(@sizeOf(Enum) == @sizeOf(u8));
+}