Remove unused uses.
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@ -278,10 +278,7 @@ fn test_hex_prefix_encode() {
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#[cfg(test)]
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mod tests {
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use std::str::FromStr;
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use std::collections::BTreeMap;
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use rustc_serialize::hex::FromHex;
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use rustc_serialize::json::Json;
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use bytes::*;
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use hash::*;
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use triehash::*;
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