// but check that all three don't return the same number (1 in 2^64 chance)
	{
		x, y, z := fastrand(), fastrand(), fastrand()
		if x == y && y == z {
			t.Fatalf("fastrand three times = %#x, %#x, %#x, want different numbers", x, y, z)
		}
	}
	{
		x, y, z := fastrandn(1e9), fastrandn(1e9), fastrandn(1e9)
		if x == y && y == z {
			t.Fatalf("fastrandn three times = %#x, %#x, %#x, want different numbers", x, y, z)
		}
	}
	{

// Too much legacy code has go:linkname references
// to runtime.fastrand and friends, so keep these around for now.
// Code should migrate to math/rand/v2.Uint64,
// which is just as fast, but that's only available in Go 1.22+.
// It would be reasonable to remove these in Go 1.24.
// Do not call these from package runtime.

//go:linkname legacy_fastrand runtime.fastrand
func legacy_fastrand() uint32 {
	return uint32(rand())
}

// license that can be found in the LICENSE file.

// Linkname fastrand is allowed _for now_, as it has a
// linknamed definition, for legacy reason.
// NOTE: this may not be allowed in the future. Don't do this!

package main

import _ "unsafe"

//go:linkname fastrand runtime.fastrand
func fastrand() uint32

func main() {
	println(fastrand())