From bce1039c9c4873f5294422ac992d2277af881323 Mon Sep 17 00:00:00 2001
From: shove <shove@163.com>
Date: Sat, 10 Sep 2022 14:35:42 +0800
Subject: [PATCH] cgen: fix missing type name when anonymous struct is used as
 parameter. fix #15698 (#15699)

---
 vlib/v/gen/c/struct.v                |  3 +--
 vlib/v/tests/anon_struct_type_test.v | 11 +++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)
 create mode 100644 vlib/v/tests/anon_struct_type_test.v

diff --git a/vlib/v/gen/c/struct.v b/vlib/v/gen/c/struct.v
index 5f3b2614af..85ce5d4c0e 100644
--- a/vlib/v/gen/c/struct.v
+++ b/vlib/v/gen/c/struct.v
@@ -49,8 +49,7 @@ fn (mut g Gen) struct_init(node ast.StructInit) {
 		}
 	}
 	if is_anon {
-		// No name needed for anon structs, C figures it out on its own.
-		g.writeln('{')
+		g.writeln('($styp){')
 	} else if g.is_shared && !g.inside_opt_data && !g.is_arraymap_set {
 		mut shared_typ := node.typ.set_flag(.shared_f)
 		shared_styp = g.typ(shared_typ)
diff --git a/vlib/v/tests/anon_struct_type_test.v b/vlib/v/tests/anon_struct_type_test.v
new file mode 100644
index 0000000000..bf1977909f
--- /dev/null
+++ b/vlib/v/tests/anon_struct_type_test.v
@@ -0,0 +1,11 @@
+module main
+
+fn func(arg struct { foo string }) {
+	assert arg.foo == 'foo'
+}
+
+fn test_anon_struct_as_parameter() {
+	func(struct {
+		foo: 'foo'
+	})
+}