move out c/cpp/py

cl/_testdata/ptrmthd/in.go

@@ -0,0 +1,19 @@
+package main
+
+import _ "unsafe"
+
+//go:linkname printf C.printf
+func printf(format *int8, __llgo_va_list ...any)
+
+type T int8
+
+func (f *T) Print(v int) {
+	printf((*int8)(f), v)
+}
+
+var format = [...]T{'H', 'e', 'l', 'l', 'o', ' ', '%', 'd', '\n', 0}
+
+func main() {
+	f := &format[0]
+	f.Print(100)
+}