From 8512cbdf15e65583042e83f87cb4f11703c95984 Mon Sep 17 00:00:00 2001
From: Samir <samirrangwalla1@outlook.com>
Date: Sun, 20 Sep 2026 13:04:39 -0400
Subject: [PATCH] Ensure function prototype is propagated when bound

---
 quickjs.c        | 10 +++++++++-
 tests/bug1732.js |  3 +++
 2 files changed, 12 insertions(+), 1 deletion(-)
 create mode 100644 tests/bug1732.js

diff --git a/quickjs.c b/quickjs.c
index 6ca030b9f..0e2791f8b 100644
--- a/quickjs.c
+++ b/quickjs.c
@@ -42574,8 +42574,16 @@ static JSValue js_function_bind(JSContext *ctx, JSValueConst this_val,
     if (check_function(ctx, this_val))
         return JS_EXCEPTION;
 
-    func_obj = JS_NewObjectProtoClass(ctx, ctx->function_proto,
+    JSValue prototype = JS_GetPrototype(ctx, this_val);
+
+    if (JS_IsException(prototype))
+        return JS_EXCEPTION;
+    
+    func_obj = JS_NewObjectProtoClass(ctx, prototype,
                                  JS_CLASS_BOUND_FUNCTION);
+    
+    JS_FreeValue(ctx, prototype);
+
     if (JS_IsException(func_obj))
         return JS_EXCEPTION;
     p = JS_VALUE_GET_OBJ(func_obj);
diff --git a/tests/bug1732.js b/tests/bug1732.js
new file mode 100644
index 000000000..c9d755e68
--- /dev/null
+++ b/tests/bug1732.js
@@ -0,0 +1,3 @@
+import { assert } from "./assert.js";
+const f = (function* () {}).constructor("aa").bind()
+assert(Object.prototype.toString.call(f) === "[object GeneratorFunction]", true);
\ No newline at end of file