From 494be20564304bb2a977a171c69fdf4fc4f8c15c Mon Sep 17 00:00:00 2001
From: Felipe Pena <felipensp@gmail.com>
Date: Tue, 9 Jul 2024 15:08:31 -0300
Subject: [PATCH] cgen: fix auto str for fn struct member (#21825)

---
 vlib/v/gen/c/auto_str_methods.v                |  3 +--
 .../struct_fn_member_print.c.must_have         |  3 +++
 .../gen/c/testdata/struct_fn_member_print.out  |  3 +++
 .../v/gen/c/testdata/struct_fn_member_print.vv | 18 ++++++++++++++++++
 4 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 vlib/v/gen/c/testdata/struct_fn_member_print.c.must_have
 create mode 100644 vlib/v/gen/c/testdata/struct_fn_member_print.out
 create mode 100644 vlib/v/gen/c/testdata/struct_fn_member_print.vv

diff --git a/vlib/v/gen/c/auto_str_methods.v b/vlib/v/gen/c/auto_str_methods.v
index b993ae29e1..208d4e39e6 100644
--- a/vlib/v/gen/c/auto_str_methods.v
+++ b/vlib/v/gen/c/auto_str_methods.v
@@ -1142,8 +1142,7 @@ fn struct_auto_str_func(sym &ast.TypeSymbol, lang ast.Language, _field_type ast.
 		}
 		return 'indent_${fn_name}(${obj}, indent_count + 1)', true
 	} else if sym.kind == .function {
-		obj := '${deref}it${op}${final_field_name}${sufix}'
-		return '${fn_name}(${obj})', true
+		return '${fn_name}()', true
 	} else if sym.kind == .chan {
 		return '${fn_name}(${deref}it${op}${final_field_name}${sufix})', true
 	} else if sym.kind == .thread {
diff --git a/vlib/v/gen/c/testdata/struct_fn_member_print.c.must_have b/vlib/v/gen/c/testdata/struct_fn_member_print.c.must_have
new file mode 100644
index 0000000000..5c9dd8b26d
--- /dev/null
+++ b/vlib/v/gen/c/testdata/struct_fn_member_print.c.must_have
@@ -0,0 +1,3 @@
+static string main__MyStruct_str(main__MyStruct it) { return indent_main__MyStruct_str(it, 0);}
+static string main__Function_str() { return _SLIT("fn (int)");}
+string _t1 = main__Function_str();
\ No newline at end of file
diff --git a/vlib/v/gen/c/testdata/struct_fn_member_print.out b/vlib/v/gen/c/testdata/struct_fn_member_print.out
new file mode 100644
index 0000000000..24e87372f3
--- /dev/null
+++ b/vlib/v/gen/c/testdata/struct_fn_member_print.out
@@ -0,0 +1,3 @@
+MyStruct{
+    func: fn (int)
+}
diff --git a/vlib/v/gen/c/testdata/struct_fn_member_print.vv b/vlib/v/gen/c/testdata/struct_fn_member_print.vv
new file mode 100644
index 0000000000..77ecd825fb
--- /dev/null
+++ b/vlib/v/gen/c/testdata/struct_fn_member_print.vv
@@ -0,0 +1,18 @@
+module main
+
+type Function = fn (int)
+
+struct MyStruct {
+        func Function @[required]
+}
+
+fn implementation(size int) {
+        println('size is ${size}')
+}
+
+fn main() {
+        m := MyStruct{
+                func: implementation
+        }
+        println('${m}')
+}
\ No newline at end of file