Remove extern crate.
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4 changed files with 3 additions and 2 deletions
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@ -37,6 +37,7 @@ use rustc_data_structures::sync::Lrc;
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use rustc_data_structures::thin_vec::ThinVec;
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use rustc_index::vec::Idx;
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use rustc_serialize::{self, Decoder, Encoder};
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use rustc_macros::HashStable_Generic;
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use std::fmt;
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