avoid some clippy warnings
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@ -60,7 +60,7 @@ fn digest_to_prefix(digest: &[u8]) -> PathBuf {
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let mut buf = Vec::<u8>::with_capacity(2+1+2+1);
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const HEX_CHARS: &'static [u8; 16] = b"0123456789abcdef";
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const HEX_CHARS: &[u8; 16] = b"0123456789abcdef";
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buf.push(HEX_CHARS[(digest[0] as usize) >> 4]);
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buf.push(HEX_CHARS[(digest[0] as usize) &0xf]);
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