move out c/cpp/py

cl/_testrt/len/in.go

@@ -0,0 +1,15 @@
+package main
+
+type data struct {
+	s string
+	c chan int
+	m map[int]string
+	a []int
+}
+
+func main() {
+	d := &data{}
+	println(len(d.s), len(d.c), len(d.m), len(d.a), cap(d.c), cap(d.a))
+	v := &data{s: "hello", c: make(chan int, 2), m: map[int]string{1: "hello"}, a: []int{1, 2, 3}}
+	println(len(v.s), len(v.c), len(v.m), len(v.a), cap(v.c), cap(v.a))
+}