Remove unused trait imports flagged by lint

Author: sanxiyn

src/libcoretest/lib.rs

@@ -15,7 +15,6 @@
 #![feature(box_syntax)]
 #![feature(cell_extras)]
 #![feature(const_fn)]
-#![feature(core_float)]
 #![feature(core_private_bignum)]
 #![feature(core_private_diy_float)]
 #![feature(dec2flt)]

src/libcoretest/num/mod.rs

@@ -52,7 +52,6 @@ pub fn test_num<T>(ten: T, two: T) where
 mod tests {
     use core::option::Option;
     use core::option::Option::{Some, None};
-    use core::num::Float;
 
     #[test]
     fn from_str_issue7588() {

src/librustc_const_eval/eval.rs

@@ -17,7 +17,7 @@ use self::EvalHint::*;
 
 use rustc::hir::map as ast_map;
 use rustc::hir::map::blocks::FnLikeNode;
-use rustc::middle::cstore::{self, CrateStore, InlinedItem};
+use rustc::middle::cstore::{self, InlinedItem};
 use rustc::{infer, traits};
 use rustc::hir::def::Def;
 use rustc::hir::def_id::DefId;

src/librustc_driver/lib.rs

@@ -70,7 +70,6 @@ use rustc_trans::back::link;
 use rustc::session::{self, config, Session, build_session, CompileResult};
 use rustc::session::config::{Input, PrintRequest, OutputType, ErrorOutputType};
 use rustc::session::config::{get_unstable_features_setting, nightly_options};
-use rustc::middle::cstore::CrateStore;
 use rustc::lint::Lint;
 use rustc::lint;
 use rustc_metadata::loader;

src/librustc_incremental/persist/data.rs

@@ -11,7 +11,6 @@
 //! The data that we will serialize and deserialize.
 
 use rustc::dep_graph::DepNode;
-use rustc_serialize::{Decoder as RustcDecoder, Encoder as RustcEncoder};
 
 use super::directory::DefPathIndex;
 

src/librustc_incremental/persist/directory.rs

@@ -18,7 +18,6 @@ use rustc::hir::map::DefPath;
 use rustc::hir::def_id::DefId;
 use rustc::ty;
 use rustc::util::nodemap::DefIdMap;
-use rustc_serialize::{Decoder as RustcDecoder, Encoder as RustcEncoder};
 use std::fmt::{self, Debug};
 
 /// Index into the DefIdDirectory

src/librustc_lint/builtin.rs

@@ -29,7 +29,6 @@
 //! a `pub fn new()`.
 
 use rustc::hir::def::Def;
-use middle::cstore::CrateStore;
 use rustc::hir::def_id::DefId;
 use middle::stability;
 use rustc::{cfg, infer};

src/librustc_lint/types.rs

@@ -26,7 +26,7 @@ use std::{i8, i16, i32, i64, u8, u16, u32, u64, f32, f64};
 
 use syntax::ast;
 use syntax::abi::Abi;
-use syntax::attr::{self, AttrMetaMethods};
+use syntax::attr;
 use syntax::codemap::{self, Span};
 
 use rustc::hir;

src/librustc_metadata/csearch.rs

@@ -536,7 +536,7 @@ impl<'tcx> CrateStore<'tcx> for cstore::CStore {
         let mut visible_parent_map = self.visible_parent_map.borrow_mut();
         if !visible_parent_map.is_empty() { return visible_parent_map; }
 
-        use rustc::middle::cstore::{CrateStore, ChildItem};
+        use rustc::middle::cstore::ChildItem;
         use std::collections::vec_deque::VecDeque;
         use std::collections::hash_map::Entry;
         for cnum in 1 .. self.next_crate_num() {

src/librustc_metadata/decoder.rs

@@ -43,7 +43,6 @@ use rustc::mir;
 use rustc::mir::visit::MutVisitor;
 
 use std::cell::Cell;
-use std::io::prelude::*;
 use std::io;
 use std::rc::Rc;
 use std::str;