From 40698f774f001f521c8296a4c3a9f9e4f1247efa Mon Sep 17 00:00:00 2001
From: gingerBill <gingerBill@users.noreply.github.com>
Date: Thu, 9 Jul 2026 11:52:03 +0100
Subject: [PATCH] Improve error message for disallowing `---` as a default
 parameter

---
 src/check_type.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/check_type.cpp b/src/check_type.cpp
index b1994311e..01bc16983 100644
--- a/src/check_type.cpp
+++ b/src/check_type.cpp
@@ -1764,7 +1764,10 @@ gb_internal ParameterValue handle_parameter_value(CheckerContext *ctx, Type *in_
 			check_assignment(ctx, &o, in_type, str_lit("parameter value"));
 		}
 	} else {
-		if (in_type) {
+		expr = unparen_expr(expr);
+		if (expr && expr->kind == Ast_Uninit) {
+			error(expr, "Default parameter cannot be ---");
+		} else if (in_type) {
 			check_expr_with_type_hint(ctx, &o, expr, in_type);
 		} else {
 			check_expr(ctx, &o, expr);