@ enum type

src/ast.zig

@@ -231,6 +231,7 @@ pub const EnumDecl = struct {
     variant_types: []const ?*Node = &.{}, // null entries = no payload; empty = payload-less enum
     is_flags: bool = false,
     variant_values: []const ?*Node = &.{}, // explicit value per variant (null = auto), empty = all auto
+    backing_type: ?*Node = null, // optional backing type: enum u8 { ... }
 };
 
 pub const UnionDecl = struct {