From 0b12d647b618d76e1e09e198dc22fe3a521a2dc9 Mon Sep 17 00:00:00 2001
From: shove <shove@163.com>
Date: Thu, 14 Dec 2023 04:32:52 +0800
Subject: [PATCH] cgen: fix wrong cname of anon fn(fix #20163) (#20164)

---
 vlib/v/gen/c/utils.v        |  6 +++---
 vlib/v/tests/anon_fn_test.v | 13 +++++++++++++
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/vlib/v/gen/c/utils.v b/vlib/v/gen/c/utils.v
index 8a449610c3..109d04cff5 100644
--- a/vlib/v/gen/c/utils.v
+++ b/vlib/v/gen/c/utils.v
@@ -113,9 +113,9 @@ fn (mut g Gen) fn_var_signature(return_type ast.Type, arg_types []ast.Type, var_
 	return sig
 }
 
-// generate anon fn cname, e.g. `anon_fn_void_int_string`
+// generate anon fn cname, e.g. `anon_fn_void_int_string`, `anon_fn_void_int_ptr_string`
 fn (mut g Gen) anon_fn_cname(return_type ast.Type, arg_types []ast.Type) string {
-	ret_styp := c_name(g.typ(return_type))
+	ret_styp := c_name(g.typ(return_type).replace('*', '_ptr'))
 	mut sig := '${ret_styp}_'
 	for j, arg_typ in arg_types {
 		arg_sym := g.table.sym(arg_typ)
@@ -124,7 +124,7 @@ fn (mut g Gen) anon_fn_cname(return_type ast.Type, arg_types []ast.Type) string
 			arg_sig := g.anon_fn_cname(func.return_type, func.params.map(it.typ))
 			sig += 'fnon_fn_' + arg_sig
 		} else {
-			arg_styp := c_name(g.typ(arg_typ))
+			arg_styp := c_name(g.typ(arg_typ).replace('*', '_ptr'))
 			sig += arg_styp
 		}
 		if j < arg_types.len - 1 {
diff --git a/vlib/v/tests/anon_fn_test.v b/vlib/v/tests/anon_fn_test.v
index ba5b4790c6..b3637af4c2 100644
--- a/vlib/v/tests/anon_fn_test.v
+++ b/vlib/v/tests/anon_fn_test.v
@@ -41,3 +41,16 @@ fn test_anon_fn_returning_a_mut_parameter_should_act_the_same_as_normal_fn_retur
 	y := fnormal(mut b, 123)
 	assert a == b
 }
+
+// for issue 20163
+struct Struct {}
+
+fn test_spawn_anon_fn_with_closure_parameters_and_mut_ref_parameters() {
+	mut s := &Struct{}
+	a := 1
+
+	t := spawn fn [a] (mut s Struct) int {
+		return a
+	}(mut s)
+	assert t.wait() == 1
+}