Remove unused trait imports

Author: sanxiyn

src/cargo/lib.rs

@@ -26,7 +26,6 @@ extern crate toml;
 extern crate url;
 
 use std::env;
-use std::error::Error;
 use std::io::prelude::*;
 use std::io;
 use rustc_serialize::{Decodable, Encodable};

src/cargo/ops/cargo_clean.rs

@@ -3,7 +3,6 @@ use std::fs;
 use std::path::Path;
 
 use core::{Package, Profiles};
-use core::source::Source;
 use util::{CargoResult, human, ChainError, Config};
 use ops::{self, Layout, Context, BuildConfig, Kind, Unit};
 

src/cargo/ops/cargo_install.rs

@@ -10,7 +10,7 @@ use std::path::{Path, PathBuf};
 use tempdir::TempDir;
 use toml;
 
-use core::{SourceId, Source, Package, Registry, Dependency, PackageIdSpec};
+use core::{SourceId, Source, Package, Dependency, PackageIdSpec};
 use core::PackageId;
 use ops::{self, CompileFilter};
 use sources::{GitSource, PathSource, RegistrySource};

src/cargo/ops/cargo_new.rs

@@ -1,6 +1,5 @@
 use std::env;
 use std::fs;
-use std::io::prelude::*;
 use std::path::Path;
 use std::collections::BTreeMap;
 

src/cargo/ops/cargo_run.rs

@@ -1,6 +1,6 @@
 use std::path::Path;
 
-use ops::{self, ExecEngine, CompileFilter};
+use ops::{self, CompileFilter};
 use util::{self, CargoResult, process, ProcessError};
 use core::Package;
 

src/cargo/ops/cargo_rustc/custom_build.rs

@@ -1,6 +1,5 @@
 use std::collections::{HashMap, BTreeSet, HashSet};
 use std::fs;
-use std::io::prelude::*;
 use std::path::{PathBuf, Path};
 use std::str;
 use std::sync::{Mutex, Arc};

src/cargo/ops/cargo_rustc/mod.rs

@@ -2,7 +2,6 @@ use std::collections::HashMap;
 use std::env;
 use std::ffi::{OsStr, OsString};
 use std::fs;
-use std::io::prelude::*;
 use std::path::{self, PathBuf};
 use std::sync::Arc;
 

src/cargo/ops/registry.rs

@@ -1,7 +1,6 @@
 use std::collections::HashMap;
 use std::env;
 use std::fs::{self, File};
-use std::io::prelude::*;
 use std::iter::repeat;
 use std::path::{Path, PathBuf};
 

src/cargo/sources/path.rs

@@ -1,6 +1,5 @@
 use std::fmt::{self, Debug, Formatter};
 use std::fs;
-use std::io::prelude::*;
 use std::path::{Path, PathBuf};
 
 use filetime::FileTime;