librustc_typeck: remove unused imports

Author: pnkfelix

Diff for: src/librustc_typeck/check/mod.rs

@@ -90,7 +90,7 @@ use middle::lang_items::IteratorItem;
 use middle::mem_categorization as mc;
 use middle::mem_categorization::McResult;
 use middle::pat_util::{self, pat_id_map};
-use middle::region::{self, CodeExtent};
+use middle::region::{CodeExtent};
 use middle::subst::{self, Subst, Substs, VecPerParamSpace, ParamSpace, TypeSpace};
 use middle::traits;
 use middle::ty::{FnSig, VariantInfo, TypeScheme};

Diff for: src/librustc_typeck/check/regionck.rs

@@ -90,7 +90,6 @@ use check::vtable;
 use middle::def;
 use middle::mem_categorization as mc;
 use middle::region::CodeExtent;
-use middle::subst;
 use middle::traits;
 use middle::ty::{ReScope};
 use middle::ty::{self, Ty, MethodCall};

Diff for: src/librustc_typeck/check/wf.rs

@@ -22,7 +22,6 @@ use util::ppaux::Repr;
 use std::collections::HashSet;
 use syntax::ast;
 use syntax::ast_util::{local_def};
-use syntax::attr;
 use syntax::codemap::Span;
 use syntax::parse::token;
 use syntax::visit;