cgen: fix go anon fn call with ref argument (fix #14192) (#14197)

Author: yuyi98

vlib/v/gen/c/fn.v

@@ -1922,6 +1922,13 @@ fn (mut g Gen) go_expr(node ast.GoExpr) {
 				g.gowrappers.write_string(call_args_str)
 			} else {
 				for i in 0 .. expr.args.len {
+					expected_nr_muls := expr.expected_arg_types[i].nr_muls()
+					arg_nr_muls := expr.args[i].typ.nr_muls()
+					if arg_nr_muls > expected_nr_muls {
+						g.gowrappers.write_string('*'.repeat(arg_nr_muls - expected_nr_muls))
+					} else if arg_nr_muls < expected_nr_muls {
+						g.gowrappers.write_string('&'.repeat(expected_nr_muls - arg_nr_muls))
+					}
 					g.gowrappers.write_string('arg->arg${i + 1}')
 					if i != expr.args.len - 1 {
 						g.gowrappers.write_string(', ')

vlib/v/tests/go_anon_fn_call_with_ref_arg_test.v

@@ -0,0 +1,15 @@
+struct Foo {
+	bar string
+}
+
+fn test_go_anon_fn_call_with_ref_arg() {
+	foo := &Foo{
+		bar: 'hello'
+	}
+	g := go fn (foo Foo) string {
+		return foo.bar
+	}(foo)
+	ret := g.wait()
+	println(ret)
+	assert ret == 'hello'
+}