# Pastebin PUlgPdwO
❯ cat test.go
package main

// typedef void (*cb)(int);
// static void helper(cb f, int x) { f(x); }
import "C"

//export highorder
func highorder(cb_p C.cb) {
	C.helper(cb_p, 42)
}
func main() {}
❯ go build -o test.so -buildmode=c-shared test.go
❯ raku -e 'use NativeCall; sub highorder(&cb (uint64)) is native("./test.so") {*}; highorder(sub (uint64 $a) { say $a })'
42