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/usr/share/gocode/src/golang.org/x/crypto/blake2s/register.go is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.

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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build go1.9

package blake2s

import (
	"crypto"
	"hash"
)

func init() {
	newHash256 := func() hash.Hash {
		h, _ := New256(nil)
		return h
	}

	crypto.RegisterHash(crypto.BLAKE2s_256, newHash256)
}