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/usr/share/go-1.10/test/linkname.dir/linkname2.go is in golang-1.10-src 1.10.1-1ubuntu2.

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package y

import _ "unsafe"

//go:linkname byteIndex linkname1.indexByte
func byteIndex(xs []byte, b byte) int

func ContainsSlash(data []byte) bool { // ERROR "leaking param: data" "can inline ContainsSlash"
	if byteIndex(data, '/') != -1 {
		return true
	}
	return false
}