This file is indexed.

/usr/share/go-1.10/test/linkname.dir/linkname1.go is in golang-1.10-src 1.10.1-1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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package x

func indexByte(xs []byte, b byte) int { // ERROR "indexByte xs does not escape"
	for i, x := range xs {
		if x == b {
			return i
		}
	}
	return -1
}