Fix warnings: unused
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@@ -33,7 +33,7 @@ use hash::keccak;
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use io::IoChannel;
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use miner::{Miner, MinerService, PendingOrdering};
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use rustc_hex::ToHex;
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use spec::{self, Spec};
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use spec::Spec;
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use state::{self, CleanupMode, State, StateInfo};
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use tempdir::TempDir;
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use test_helpers::{
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