abi: support named

cl/_testgo/struczero/in.go

@@ -0,0 +1,17 @@
+package main
+
+type bar struct {
+	pb *byte
+	f  float32
+}
+
+func Foo(v any) (ret bar, ok bool) {
+	ret, ok = v.(bar)
+	return
+}
+
+func main() {
+	ret, ok := Foo(nil)
+	println("Hi")
+	println(ret.pb, ret.f, ok)
+}