Remove unused crate imports in 2018 edition crates

src/liballoc/collections/vec_deque/tests.rs

@@ -1,7 +1,5 @@
 use super::*;
 
-use test;
-
 #[bench]
 #[cfg_attr(miri, ignore)] // isolated Miri does not support benchmarks
 fn bench_push_back_100(b: &mut test::Bencher) {

src/librustc_ast_pretty/pprust/tests.rs

@@ -2,7 +2,6 @@ use super::*;
 
 use rustc_ast::ast;
 use rustc_ast::with_default_globals;
-use rustc_span;
 use rustc_span::source_map::respan;
 use rustc_span::symbol::Ident;
 

src/librustc_data_structures/sync.rs

@@ -358,7 +358,6 @@ cfg_if! {
         use parking_lot::Mutex as InnerLock;
         use parking_lot::RwLock as InnerRwLock;
 
-        use std;
         use std::thread;
         pub use rayon::{join, scope};
 

src/libstd/os/illumos/fs.rs

@@ -1,7 +1,5 @@
 #![stable(feature = "metadata_ext", since = "1.1.0")]
 
-use libc;
-
 use crate::fs::Metadata;
 use crate::sys_common::AsInner;
 

src/libstd/sys/unix/ext/net.rs

@@ -2,9 +2,6 @@
 
 //! Unix-specific networking functionality
 
-#[cfg(unix)]
-use libc;
-
 // FIXME(#43348): Make libc adapt #[doc(cfg(...))] so we don't need these fake definitions here?
 #[cfg(not(unix))]
 #[allow(non_camel_case_types)]

src/libstd/sys/vxworks/args.rs

@@ -56,7 +56,6 @@ mod imp {
     use crate::ffi::{CStr, OsString};
     use crate::marker::PhantomData;
     use crate::ptr;
-    use libc;
 
     use crate::sys_common::mutex::Mutex;
 

src/libstd/sys/vxworks/ext/fs.rs

@@ -6,7 +6,6 @@ use crate::path::Path;
 use crate::sys;
 use crate::sys::platform::fs::MetadataExt as UnixMetadataExt;
 use crate::sys_common::{AsInner, AsInnerMut, FromInner};
-use libc;
 
 /// Unix-specific extensions to [`File`].
 ///

src/libstd/sys/vxworks/rand.rs

@@ -13,7 +13,6 @@ pub fn hashmap_random_keys() -> (u64, u64) {
 mod imp {
     use crate::io;
     use core::sync::atomic::{AtomicBool, Ordering::Relaxed};
-    use libc;
 
     pub fn fill_bytes(v: &mut [u8]) {
         static RNG_INIT: AtomicBool = AtomicBool::new(false);

src/libstd/sys/vxworks/rwlock.rs

@@ -1,6 +1,5 @@
 use crate::cell::UnsafeCell;
 use crate::sync::atomic::{AtomicUsize, Ordering};
-use libc;
 
 pub struct RWLock {
     inner: UnsafeCell<libc::pthread_rwlock_t>,

src/libstd/sys/vxworks/time.rs

@@ -1,7 +1,6 @@
 use crate::cmp::Ordering;
 use crate::time::Duration;
 use ::core::hash::{Hash, Hasher};
-use libc;
 
 pub use self::inner::{Instant, SystemTime, UNIX_EPOCH};
 use crate::convert::TryInto;
@@ -104,7 +103,6 @@ mod inner {
     use crate::fmt;
     use crate::sys::cvt;
     use crate::time::Duration;
-    use libc;
 
     use super::Timespec;
 

src/libstd/sys/wasi/alloc.rs

@@ -1,7 +1,6 @@
 use crate::alloc::{GlobalAlloc, Layout, System};
 use crate::ptr;
 use crate::sys_common::alloc::{realloc_fallback, MIN_ALIGN};
-use libc;
 
 #[stable(feature = "alloc_system_type", since = "1.28.0")]
 unsafe impl GlobalAlloc for System {

src/tools/build-manifest/src/main.rs

@@ -7,7 +7,6 @@
 #![deny(warnings)]
 
 use serde::Serialize;
-use toml;
 
 use std::collections::BTreeMap;
 use std::collections::HashMap;

src/tools/compiletest/src/json.rs

@@ -4,7 +4,6 @@
 use crate::errors::{Error, ErrorKind};
 use crate::runtest::ProcRes;
 use serde::Deserialize;
-use serde_json;
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
 

src/tools/compiletest/src/main.rs

@@ -9,8 +9,6 @@ extern crate test;
 use crate::common::{expected_output_path, output_base_dir, output_relative_path, UI_EXTENSIONS};
 use crate::common::{CompareMode, Config, Debugger, Mode, PassMode, Pretty, TestPaths};
 use crate::util::logv;
-use env_logger;
-use getopts;
 use getopts::Options;
 use log::*;
 use std::env;

src/tools/compiletest/src/read2.rs

@@ -25,7 +25,6 @@ mod imp {
 
 #[cfg(unix)]
 mod imp {
-    use libc;
     use std::io;
     use std::io::prelude::*;
     use std::mem;

src/tools/compiletest/src/runtest.rs

@@ -13,7 +13,6 @@ use crate::header::TestProps;
 use crate::json;
 use crate::util::get_pointer_width;
 use crate::util::{logv, PathBufExt};
-use diff;
 use regex::{Captures, Regex};
 use rustfix::{apply_suggestions, get_suggestions_from_json, Filter};