Remove some unused extern crate
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@ -6,11 +6,8 @@
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// From rustc.
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#[macro_use]
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extern crate log;
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extern crate log_settings;
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#[macro_use]
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extern crate rustc;
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extern crate rustc_const_math;
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extern crate rustc_data_structures;
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extern crate syntax;
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use rustc::ty::{self, TyCtxt};
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