Auto merge of #58208 - taiki-e:libstd-2018, r=Centril

libstd => 2018

Transitions `libstd` to Rust 2018; cc #58099

r? @Centril

Author: bors

Diff for: src/libstd/Cargo.toml

@@ -6,6 +6,7 @@ build = "build.rs"
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rust-lang/rust.git"
 description = "The Rust Standard Library"
+edition = "2018"
 
 [lib]
 name = "std"

Diff for: src/libstd/alloc.rs

@@ -64,7 +64,8 @@
 use core::sync::atomic::{AtomicPtr, Ordering};
 use core::{mem, ptr};
 use core::ptr::NonNull;
-use sys_common::util::dumb_print;
+
+use crate::sys_common::util::dumb_print;
 
 #[stable(feature = "alloc_module", since = "1.28.0")]
 #[doc(inline)]
@@ -208,7 +209,7 @@ pub fn rust_oom(layout: Layout) -> ! {
         unsafe { mem::transmute(hook) }
     };
     hook(layout);
-    unsafe { ::sys::abort_internal(); }
+    unsafe { crate::sys::abort_internal(); }
 }
 
 #[cfg(not(test))]

Diff for: src/libstd/build.rs

@@ -1,7 +1,5 @@
 #![deny(warnings)]
 
-extern crate cc;
-
 use std::env;
 
 fn main() {

Diff for: src/libstd/collections/hash/bench.rs

@@ -1,8 +1,6 @@
 #![cfg(test)]
 
-extern crate test;
-
-use self::test::Bencher;
+use test::Bencher;
 
 #[bench]
 fn new_drop(b: &mut Bencher) {

Diff for: src/libstd/collections/hash/map.rs

@@ -1,18 +1,18 @@
 use self::Entry::*;
 use self::VacantEntryState::*;
 
-use intrinsics::unlikely;
-use collections::CollectionAllocErr;
-use cell::Cell;
-use borrow::Borrow;
-use cmp::max;
-use fmt::{self, Debug};
+use crate::intrinsics::unlikely;
+use crate::collections::CollectionAllocErr;
+use crate::cell::Cell;
+use crate::borrow::Borrow;
+use crate::cmp::max;
+use crate::fmt::{self, Debug};
 #[allow(deprecated)]
-use hash::{Hash, Hasher, BuildHasher, SipHasher13};
-use iter::{FromIterator, FusedIterator};
-use mem::{self, replace};
-use ops::{Deref, DerefMut, Index};
-use sys;
+use crate::hash::{Hash, Hasher, BuildHasher, SipHasher13};
+use crate::iter::{FromIterator, FusedIterator};
+use crate::mem::{self, replace};
+use crate::ops::{Deref, DerefMut, Index};
+use crate::sys;
 
 use super::table::{self, Bucket, EmptyBucket, Fallibility, FullBucket, FullBucketMut, RawTable,
                    SafeHash};
@@ -3328,7 +3328,7 @@ mod test_map {
     use super::HashMap;
     use super::Entry::{Occupied, Vacant};
     use super::RandomState;
-    use cell::RefCell;
+    use crate::cell::RefCell;
     use rand::{thread_rng, Rng};
     use realstd::collections::CollectionAllocErr::*;
     use realstd::mem::size_of;

Diff for: src/libstd/collections/hash/set.rs

@@ -1,8 +1,8 @@
-use borrow::Borrow;
-use fmt;
-use hash::{Hash, BuildHasher};
-use iter::{Chain, FromIterator, FusedIterator};
-use ops::{BitOr, BitAnd, BitXor, Sub};
+use crate::borrow::Borrow;
+use crate::fmt;
+use crate::hash::{Hash, BuildHasher};
+use crate::iter::{Chain, FromIterator, FusedIterator};
+use crate::ops::{BitOr, BitAnd, BitXor, Sub};
 
 use super::Recover;
 use super::map::{self, HashMap, Keys, RandomState};
@@ -1751,7 +1751,7 @@ mod test_set {
 
     #[test]
     fn test_replace() {
-        use hash;
+        use crate::hash;
 
         #[derive(Debug)]
         struct Foo(&'static str, i32);

Diff for: src/libstd/collections/hash/table.rs

@@ -1,12 +1,11 @@
-use alloc::{Global, Alloc, Layout, LayoutErr, handle_alloc_error};
-use collections::CollectionAllocErr;
-use hash::{BuildHasher, Hash, Hasher};
-use marker;
-use mem::{size_of, needs_drop};
-use mem;
-use ops::{Deref, DerefMut};
-use ptr::{self, Unique, NonNull};
-use hint;
+use crate::alloc::{Global, Alloc, Layout, LayoutErr, handle_alloc_error};
+use crate::collections::CollectionAllocErr;
+use crate::hash::{BuildHasher, Hash, Hasher};
+use crate::marker;
+use crate::mem::{self, size_of, needs_drop};
+use crate::ops::{Deref, DerefMut};
+use crate::ptr::{self, Unique, NonNull};
+use crate::hint;
 
 use self::BucketState::*;
 

Diff for: src/libstd/collections/mod.rs

@@ -412,7 +412,7 @@
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_deprecated(reason = "moved to `std::ops::Bound`", since = "1.26.0")]
 #[doc(hidden)]
-pub use ops::Bound;
+pub use crate::ops::Bound;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use alloc_crate::collections::{BinaryHeap, BTreeMap, BTreeSet};
 #[stable(feature = "rust1", since = "1.0.0")]

Diff for: src/libstd/env.rs

@@ -13,13 +13,13 @@
 
 #![stable(feature = "env", since = "1.0.0")]
 
-use error::Error;
-use ffi::{OsStr, OsString};
-use fmt;
-use io;
-use path::{Path, PathBuf};
-use sys;
-use sys::os as os_imp;
+use crate::error::Error;
+use crate::ffi::{OsStr, OsString};
+use crate::fmt;
+use crate::io;
+use crate::path::{Path, PathBuf};
+use crate::sys;
+use crate::sys::os as os_imp;
 
 /// Returns the current working directory as a [`PathBuf`].
 ///
@@ -800,7 +800,7 @@ impl fmt::Debug for ArgsOs {
 /// Constants associated with the current target
 #[stable(feature = "env", since = "1.0.0")]
 pub mod consts {
-    use sys::env::os;
+    use crate::sys::env::os;
 
     /// A string describing the architecture of the CPU that is currently
     /// in use.
@@ -972,7 +972,7 @@ mod arch {
 mod tests {
     use super::*;
 
-    use path::Path;
+    use crate::path::Path;
 
     #[test]
     #[cfg_attr(target_os = "emscripten", ignore)]
@@ -995,7 +995,7 @@ mod tests {
     #[test]
     #[cfg(windows)]
     fn split_paths_windows() {
-        use path::PathBuf;
+        use crate::path::PathBuf;
 
         fn check_parse(unparsed: &str, parsed: &[&str]) -> bool {
             split_paths(unparsed).collect::<Vec<_>>() ==
@@ -1017,7 +1017,7 @@ mod tests {
     #[test]
     #[cfg(unix)]
     fn split_paths_unix() {
-        use path::PathBuf;
+        use crate::path::PathBuf;
 
         fn check_parse(unparsed: &str, parsed: &[&str]) -> bool {
             split_paths(unparsed).collect::<Vec<_>>() ==
@@ -1034,7 +1034,7 @@ mod tests {
     #[test]
     #[cfg(unix)]
     fn join_paths_unix() {
-        use ffi::OsStr;
+        use crate::ffi::OsStr;
 
         fn test_eq(input: &[&str], output: &str) -> bool {
             &*join_paths(input.iter().cloned()).unwrap() ==
@@ -1052,7 +1052,7 @@ mod tests {
     #[test]
     #[cfg(windows)]
     fn join_paths_windows() {
-        use ffi::OsStr;
+        use crate::ffi::OsStr;
 
         fn test_eq(input: &[&str], output: &str) -> bool {
             &*join_paths(input.iter().cloned()).unwrap() ==

Diff for: src/libstd/error.rs

@@ -13,17 +13,18 @@
 // coherence challenge (e.g., specialization, neg impls, etc) we can
 // reconsider what crate these items belong in.
 
-use alloc::{AllocErr, LayoutErr, CannotReallocInPlace};
-use any::TypeId;
-use borrow::Cow;
-use cell;
-use char;
 use core::array;
-use fmt::{self, Debug, Display};
-use mem::transmute;
-use num;
-use str;
-use string;
+
+use crate::alloc::{AllocErr, LayoutErr, CannotReallocInPlace};
+use crate::any::TypeId;
+use crate::borrow::Cow;
+use crate::cell;
+use crate::char;
+use crate::fmt::{self, Debug, Display};
+use crate::mem::transmute;
+use crate::num;
+use crate::str;
+use crate::string;
 
 /// `Error` is a trait representing the basic expectations for error values,
 /// i.e., values of type `E` in [`Result<T, E>`]. Errors must describe
@@ -852,7 +853,7 @@ impl dyn Error + Send + Sync {
 #[cfg(test)]
 mod tests {
     use super::Error;
-    use fmt;
+    use crate::fmt;
 
     #[derive(Debug, PartialEq)]
     struct A;

Diff for: src/libstd/f32.rs

@@ -9,9 +9,9 @@
 #![allow(missing_docs)]
 
 #[cfg(not(test))]
-use intrinsics;
+use crate::intrinsics;
 #[cfg(not(test))]
-use sys::cmath;
+use crate::sys::cmath;
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::f32::{RADIX, MANTISSA_DIGITS, DIGITS, EPSILON};
@@ -488,7 +488,7 @@ impl f32 {
     #[inline]
     pub fn log2(self) -> f32 {
         #[cfg(target_os = "android")]
-        return ::sys::android::log2f32(self);
+        return crate::sys::android::log2f32(self);
         #[cfg(not(target_os = "android"))]
         return unsafe { intrinsics::log2f32(self) };
     }
@@ -932,7 +932,7 @@ impl f32 {
     #[inline]
     pub fn acosh(self) -> f32 {
         match self {
-            x if x < 1.0 => ::f32::NAN,
+            x if x < 1.0 => crate::f32::NAN,
             x => (x + ((x * x) - 1.0).sqrt()).ln(),
         }
     }
@@ -960,10 +960,10 @@ impl f32 {
 
 #[cfg(test)]
 mod tests {
-    use f32;
-    use f32::*;
-    use num::*;
-    use num::FpCategory as Fp;
+    use crate::f32;
+    use crate::f32::*;
+    use crate::num::*;
+    use crate::num::FpCategory as Fp;
 
     #[test]
     fn test_num_f32() {

Diff for: src/libstd/f64.rs

@@ -9,9 +9,9 @@
 #![allow(missing_docs)]
 
 #[cfg(not(test))]
-use intrinsics;
+use crate::intrinsics;
 #[cfg(not(test))]
-use sys::cmath;
+use crate::sys::cmath;
 
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::f64::{RADIX, MANTISSA_DIGITS, DIGITS, EPSILON};
@@ -436,7 +436,7 @@ impl f64 {
     pub fn log2(self) -> f64 {
         self.log_wrapper(|n| {
             #[cfg(target_os = "android")]
-            return ::sys::android::log2f64(n);
+            return crate::sys::android::log2f64(n);
             #[cfg(not(target_os = "android"))]
             return unsafe { intrinsics::log2f64(n) };
         })
@@ -906,10 +906,10 @@ impl f64 {
 
 #[cfg(test)]
 mod tests {
-    use f64;
-    use f64::*;
-    use num::*;
-    use num::FpCategory as Fp;
+    use crate::f64;
+    use crate::f64::*;
+    use crate::num::*;
+    use crate::num::FpCategory as Fp;
 
     #[test]
     fn test_num_f64() {

Diff for: src/libstd/ffi/c_str.rs

@@ -1,19 +1,19 @@
-use ascii;
-use borrow::{Cow, Borrow};
-use cmp::Ordering;
-use error::Error;
-use fmt::{self, Write};
-use io;
-use mem;
-use memchr;
-use ops;
-use os::raw::c_char;
-use ptr;
-use rc::Rc;
-use slice;
-use str::{self, Utf8Error};
-use sync::Arc;
-use sys;
+use crate::ascii;
+use crate::borrow::{Cow, Borrow};
+use crate::cmp::Ordering;
+use crate::error::Error;
+use crate::fmt::{self, Write};
+use crate::io;
+use crate::mem;
+use crate::memchr;
+use crate::ops;
+use crate::os::raw::c_char;
+use crate::ptr;
+use crate::rc::Rc;
+use crate::slice;
+use crate::str::{self, Utf8Error};
+use crate::sync::Arc;
+use crate::sys;
 
 /// A type representing an owned, C-compatible, nul-terminated string with no nul bytes in the
 /// middle.
@@ -1303,12 +1303,12 @@ impl AsRef<CStr> for CString {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use os::raw::c_char;
-    use borrow::Cow::{Borrowed, Owned};
-    use hash::{Hash, Hasher};
-    use collections::hash_map::DefaultHasher;
-    use rc::Rc;
-    use sync::Arc;
+    use crate::os::raw::c_char;
+    use crate::borrow::Cow::{Borrowed, Owned};
+    use crate::hash::{Hash, Hasher};
+    use crate::collections::hash_map::DefaultHasher;
+    use crate::rc::Rc;
+    use crate::sync::Arc;
 
     #[test]
     fn c_to_rust() {