Update books for Rust 2018
This PR:
1. updates all of the books
* I don't know if @Gankro has further plans for the nomicon or not
2. updates the build process because TRPL is only distributing one edition now
3. fixes up the stdlib links
I think that this passes but it's 3:20 am and so I'm sending it in and will fix up anything i missed in the morning.
/cc @alexcrichton for the big beta backport
resolve: Make "empty import canaries" invisible from other crates
Empty imports `use prefix::{};` are desugared into `use prefix::{self as _};` to make sure the prefix is checked for privacy/stability/etc.
This caused issues in cross-crate scenarios because gensyms are lost in crate metadata (the `_` is a gensym).
Fixes https://github.com/rust-lang/rust/issues/55811
rustc: remove {FxHash,Node,DefId,HirId,ItemLocal}{Map,Set} "constructor" fns.
These are cruft left over from a time when `Foo::default()` didn't "just work".
Allow #[must_use] on traits
Addresses https://github.com/rust-lang/rust/issues/55506, but we'll probably want to add it to some library traits like `Iterator` before the issue is considered fixed. Fixes https://github.com/rust-lang/rust/issues/51560.
`#[must_use]` is already permitted on traits, with no effect, so this seems like a bug fix, but I might be overlooking something. This currently warns for `impl Trait` or `dyn Trait` when the `Trait` is `#[must_use]` (although I don't think the latter is currently possible, so it's simply future-proofed).
Add temporary renames to manifests for rustfmt/clippy
This will be part of our strategy for shipping renamed versions of these
components for the Rust 2018 edition.
Closes#55967
Fix stability hole with `static _`
The `underscore_const_names` only gated const items with `_` as the name.
`static _: () = ();` works on beta without feature gates right now, this PR fixes that.
Revert #51601Closes: #55985
Specialization of `StepBy<Range(Inclusive)>` results in an incorrectly behaving code when `step_by` is combined with `skip` or `nth`.
If this will get merged we probably should reopen issues previously closed by #51601 (if there was any).
Ignore non-semantic tokens for 'probably_eq' streams.
Improves the situation in #43081 by skipping typically non-semantic tokens when checking for 'probably_eq'.
r? @alexcrichton
Rollup of 25 pull requests
Successful merges:
- #55562 (Add powerpc- and powerpc64-unknown-linux-musl targets)
- #55564 (test/linkage-visibility: Ignore on musl targets)
- #55827 (A few tweaks to iterations/collecting)
- #55834 (Forward the ABI of the non-zero sized fields of an union if they have the same ABI)
- #55857 (remove unused dependency)
- #55862 (in which the E0618 "expected function" diagnostic gets a makeover)
- #55867 (do not panic just because cargo failed)
- #55894 (miri enum discriminant handling: Fix treatment of pointers, better error when it is undef)
- #55916 (Make miri value visitor useful for mutation)
- #55919 (core/tests/num: Simplify `test_int_from_str_overflow()` test code)
- #55923 (reword #[test] attribute error on fn items)
- #55949 (ty: return impl Iterator from Predicate::walk_tys)
- #55952 (Update to Clang 7 on CI.)
- #55953 (#53488 Refactoring UpvarId)
- #55962 (rustdoc: properly calculate spans for intra-doc link resolution errors)
- #55963 (Stress test for MPSC)
- #55968 (Clean up some non-mod-rs stuff.)
- #55970 (Miri backtrace improvements)
- #56007 (CTFE: dynamically make sure we do not call non-const-fn)
- #56011 (Replace data.clone() by Arc::clone(&data) in mutex doc.)
- #56012 (avoid shared ref in UnsafeCell::get)
- #56016 (Add VecDeque::resize_with)
- #56027 (docs: Add missing backtick in object_safety.rs docs)
- #56043 (remove "approx env bounds" if we already know from trait)
- #56059 (Increase `Duration` approximate equal threshold to 1us)
Increase `Duration` approximate equal threshold to 1us
Previously this threshold when testing was 100ns, but the Windows
documentation states:
> which is a high resolution (<1us) time stamp
which presumably means that we could have up to 1us resolution, which
means that 100ns doesn't capture "equivalent" time intervals due to
various bits of rounding here and there.
It's hoped that this..
Closes#56034
remove "approx env bounds" if we already know from trait
Alternative to https://github.com/rust-lang/rust/pull/55988 that fixes#55756 -- smaller fix that I cannot see having (correctness) repercussions beyond the test at hand, and hence better for backporting. (Famous last words, I know.)
r? @eddyb
Add VecDeque::resize_with
This already exists on `Vec`; I'm just adding it to `VecDeque`.
I wanted to resize a `VecDeque<Vec<T>>` when I didn't know `T: Clone`, so I couldn't use `.resize(n, Vec::new())`. With this I could do `.resize_with(n, Vec::new)` instead, which doesn't need `T: Clone`.
Tracking issue: https://github.com/rust-lang/rust/issues/41758
avoid shared ref in UnsafeCell::get
Avoid taking a shared reference in `UnsafeCell::get`. This *should* be taking a raw reference (see https://github.com/rust-lang/rfcs/pull/2582), but that operation is not currently available, so I propose we exploit `repr(transparent)` instead and cast the pointer around.
This is required to make `UnsafeCell::get` pass the [stacked borrows implementation](https://www.ralfj.de/blog/2018/11/16/stacked-borrows-implementation.html) in miri (currently, `UnsafeCell::get` is on a whitelist, but that is of course not very satisfying). It shouldn't affect normal execution/codegen. Would be great if we could get this landed and shrink miri's whitelist!
Cc @nikomatsakis
Replace data.clone() by Arc::clone(&data) in mutex doc.
Arc::clone(&from) is considered as more idiomatic because it conveys more explicitly the meaning of the code.
Since this clone is visible in the official documentation, I thought it could be better to use the more idiomatic version.
CTFE: dynamically make sure we do not call non-const-fn
I'd love to have a test case for this, but I don't know how.
I am also really surprised by this test case that changed behavior: Why did it even start execution if it already determined that it shouldn't?!?
r? @oli-obk
Miri backtrace improvements
Nicer pretty-printing of the `RUST_CTFE_BACKTRACE`-backtraces:
```
0: backtrace::backtrace::libunwind::trace::hc410fcb66fe85b11
at /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.9/src/backtrace/libunwind.rs:53
backtrace::backtrace::trace::h2106294a22648407
at /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.9/src/backtrace/mod.rs:42
1: backtrace::capture::Backtrace::new_unresolved::h5d8d98b993d092ba
at /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.9/src/capture.rs:88
2: <rustc::mir::interpret::error::EvalError<'tcx> as core::convert::From<rustc::mir::interpret::error::EvalErrorKind<'tcx, u64>>>::from::h6355269b2a661412
at librustc/mir/interpret/error.rs:236
3: <T as core::convert::Into<U>>::into::h70fcb917509539bd
at /home/r/src/rust/rustc.2/src/libcore/convert.rs:455
4: <rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, miri::Evaluator<'tcx>> as miri::fn_call::EvalContextExt<'tcx, 'mir>>::emulate_foreign_item::h9cde0e3ce7455a4a
at src/fn_call.rs:292
5: <rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, miri::Evaluator<'tcx>> as miri::fn_call::EvalContextExt<'tcx, 'mir>>::find_fn::h83f89524b9d1a49a
at src/fn_call.rs:74
6: <miri::Evaluator<'tcx> as rustc_mir::interpret::machine::Machine<'a, 'mir, 'tcx>>::find_fn::hf9980473c4775f0c
at src/lib.rs:345
rustc_mir::interpret::terminator::<impl rustc_mir::interpret::eval_context::EvalContext<'a, 'mir, 'tcx, M>>::eval_fn_call::h401dec4a687f96e9
at /home/r/src/rust/rustc.2/src/librustc_mir/interpret/terminator.rs:285
```
Indentation is now consistent with `RUST_BACKTRACE`, and the frame number is not repeated when there are multiple symbols for a frame.
Also preserve the `ty::Instance` for the internal backtrace (showing which frames in the user code where on the interpreter stack when the error happened), used by miri to avoid printing spans for libstd internals:
```
error[E0080]: constant evaluation error: the evaluated program panicked
--> /home/r/src/rust/rustc.2/src/libstd/panicking.rs:525:9
|
525 | __rust_start_panic(obj as usize)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the evaluated program panicked
|
= note: inside call to `std::panicking::rust_panic` at /home/r/src/rust/rustc.2/src/libstd/panicking.rs:496:5
= note: inside call to `std::panicking::rust_panic_with_hook` at /home/r/src/rust/rustc.2/src/libstd/panicking.rs:390:5
= note: inside call to `std::panicking::continue_panic_fmt` at /home/r/src/rust/rustc.2/src/libstd/panicking.rs:345:5
note: inside call to `std::rt::begin_panic_fmt` at <::std::macros::panic macros>:8:1
--> tests/compile-fail/panic.rs:4:5
|
4 | assert_eq!(5, 6);
| ^^^^^^^^^^^^^^^^^
= note: inside call to `main` at /home/r/src/rust/rustc.2/src/libstd/rt.rs:74:34
= note: inside call to closure at /home/r/src/rust/rustc.2/src/libstd/rt.rs:59:75
= note: inside call to closure at /home/r/src/rust/rustc.2/src/libstd/sys_common/backtrace.rs:136:5
= note: inside call to `std::sys_common::backtrace::__rust_begin_short_backtrace::<[closure@DefId(1/1:1913 ~ std[78f0]::rt[0]::lang_start_internal[0]::{{closure}}[0]::{{closure}}[0]) 0:&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/r/src/rust/rustc.2/src/libstd/rt.rs:59:13
= note: inside call to closure at /home/r/src/rust/rustc.2/src/libstd/panicking.rs:310:40
= note: inside call to `std::panicking::try::do_call::<[closure@DefId(1/1:1912 ~ std[78f0]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/r/src/rust/rustc.2/src/libstd/panicking.rs:306:5
= note: inside call to `std::panicking::try::<i32, [closure@DefId(1/1:1912 ~ std[78f0]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe]>` at /home/r/src/rust/rustc.2/src/libstd/panic.rs:398:9
= note: inside call to `std::panic::catch_unwind::<[closure@DefId(1/1:1912 ~ std[78f0]::rt[0]::lang_start_internal[0]::{{closure}}[0]) 0:&&dyn std::ops::Fn() -> i32 + std::marker::Sync + std::panic::RefUnwindSafe], i32>` at /home/r/src/rust/rustc.2/src/libstd/rt.rs:58:25
= note: inside call to `std::rt::lang_start_internal` at /home/r/src/rust/rustc.2/src/libstd/rt.rs:74:5
= note: inside call to `std::rt::lang_start::<()>`
```
Also notice that we show filenames and line numbers here now.
r? @oli-obk
Clean up some non-mod-rs stuff.
This includes the following:
- Remove unused `non_modrs_mods` from `ParseSess` which as only used for feature gate diagnostics.
- Remove the vestiges of the feature gate tests in `test/ui`, they were only partially removed during stabilization.
- Fix the run-pass test, it was accidentally removed during stabilization.
- Add a ui test to verify error behavior for missing inline-nested mods.
- Add some tests for `#[path]` for inline-nested mods (both mod and non-mod-rs).
- Enable the diagnostic tests on windows, they should be fixed by #49478.
cc @cramertj
Stress test for MPSC
`concurrent_recv_timeout_and_upgrade` reproduces a problem 100%
times on my MacBook with command:
```
./x.py test --stage 0 ./src/test/run-pass/mpsc_stress.rs
```
Thus it is commented out.
Other tests cases were useful for catching another test cases
which may arise during the fix.
This diff is a part of my previous rewrite attempt: #42883
CC #39364
rustdoc: properly calculate spans for intra-doc link resolution errors
Fixes https://github.com/rust-lang/rust/issues/55723
When rustdoc is reporting a resolution error for intra-doc links, it needs to convert a span from one relative to the *markdown* (as the links are only found on the final markdown text) to one relative to the *source code* (as the error reporting is meant to show where the line is in the source, so the user can fix it). However, a calculation for how much "offset" to apply had a subtle error: it trimmed the whole line when attempting to account for leading indentation. This caused it to add in *trailing* whitespace into this calculation, which created an incorrect span.
In a lot of situations, this isn't a problem - the span will be shifted in the code slightly, but the warning will still be displayed and mostly legible. However, there is one important situation where this can cause an ICE: multi-byte codepoints. If a shifted span now has a starting point in the middle of a multi-byte codepoint, libsyntax will panic when trying to track what source item it corresponds to. This flew under our radar because trailing whitespace and multi-byte codepoints are both situations that we don't run into in the compiler repo.
(There is one more situation where this can error, that will be much harder to fix: block-style doc comments. Lines in a block-style doc comment have a zero-or-more (usually one) character offset per line, causing this calculation to be way off. I'm punting that to another issue, though...)
