const go/build.safeString
2 uses
go/build (current package)
build.go#L1773: const safeString = "+-.,/0123456789=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz:$@%! ~^"
build.go#L1780: if c := s[i]; c < utf8.RuneSelf && strings.IndexByte(safeString, c) < 0 {
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