const go/build.safeString

2 uses

	go/build (current package)
		build.go#L1759: const safeString = "+-.,/0123456789=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz:$@%! ~^"
		build.go#L1766: 		if c := s[i]; c < utf8.RuneSelf && strings.IndexByte(safeString, c) < 0 {

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