Auto merge of #33091 - sanxiyn:unused-trait-import-3, r=nrc

Warn unused trait imports, rebased

Rebase of #30021.

Fix #25730.

3 files changed, 0 insertions, 3 deletions

diff --git a/src/libstd/collections/hash/bench.rs b/src/libstd/collections/hash/bench.rs
index 9fae9af2d54..a1275d23d57 100644
--- a/src/libstd/collections/hash/bench.rs
+++ b/src/libstd/collections/hash/bench.rs
@@ -11,7 +11,6 @@
 #![cfg(test)]
 
 extern crate test;
-use prelude::v1::*;
 
 use self::test::Bencher;
 
diff --git a/src/libstd/io/error.rs b/src/libstd/io/error.rs
index 9a605fc7bbf..e142c78569b 100644
--- a/src/libstd/io/error.rs
+++ b/src/libstd/io/error.rs
@@ -350,7 +350,6 @@ mod test {
     use prelude::v1::*;
     use super::{Error, ErrorKind};
     use error;
-    use error::Error as error_Error;
     use fmt;
     use sys::os::error_string;
 
diff --git a/src/libstd/sys/windows/fs.rs b/src/libstd/sys/windows/fs.rs
index 529e42248f6..3cd45afaf01 100644
--- a/src/libstd/sys/windows/fs.rs
+++ b/src/libstd/sys/windows/fs.rs
@@ -9,7 +9,6 @@
 // except according to those terms.
 
 use prelude::v1::*;
-use io::prelude::*;
 use os::windows::prelude::*;
 
 use ffi::OsString;