bors [Thu, 25 Oct 2018 14:40:22 +0000 (14:40 +0000)]
Auto merge of #55347 - pietroalbini:rollup, r=pietroalbini
Rollup of 22 pull requests
Successful merges:
- #53507 (Add doc for impl From for Waker)
- #53931 (Gradually expanding libstd's keyword documentation)
- #54965 (update tcp stream documentation)
- #54977 (Accept `Option<Box<$t:ty>>` in macro argument)
- #55138 (in which unused-parens suggestions heed what the user actually wrote)
- #55173 (Suggest appropriate syntax on missing lifetime specifier in return type)
- #55200 (Documents `From` implementations for `Stdio`)
- #55245 (submodules: update clippy from 5afdf8b7 to b1d03437)
- #55247 (Clarified code example in char primitive doc)
- #55251 (Fix a typo in the documentation of RangeInclusive)
- #55253 (only issue "variant of the expected type" suggestion for enums)
- #55254 (Correct trailing ellipsis in name_from_pat)
- #55269 (fix typos in various places)
- #55282 (Remove redundant clone)
- #55285 (Do some copy editing on the release notes)
- #55291 (Update stdsimd submodule)
- #55296 (Set RUST_BACKTRACE=0 for rustdoc-ui/failed-doctest-output.rs)
- #55306 (Regression test for #54478.)
- #55328 (Fix doc for new copysign functions)
- #55340 (Operands no longer appear in places)
- #55345 (Remove is_null)
- #55348 (Update RELEASES.md after destabilization of non_modrs_mods)
Pietro Albini [Thu, 25 Oct 2018 12:31:24 +0000 (14:31 +0200)]
Rollup merge of #55345 - RalfJung:no-null, r=oli-obk
Remove is_null
It was confusingly named (`is_zero` would have been better, as someone pointed out somewhere but I forgot who or where), and it didn't even reliably test for "is this value 0 at run-time" because out-of-bounds pointers *can* be 0.
It's not used in rustc, and miri only really needs `is_null_ptr` and `to_bytes() == 0`, so let's just kill this method.
Pietro Albini [Thu, 25 Oct 2018 12:31:10 +0000 (14:31 +0200)]
Rollup merge of #55253 - zackmdavis:some_suggestion, r=pnkfelix
only issue "variant of the expected type" suggestion for enums
This suggestion (introduced in pull-request #43178 / eac74104) was being issued for one-field-struct expected types (in which case it is misleading and outright wrong), even though it was only intended for one-field enum-variants (most notably, `Some`).
Add a conditional to adhere to the original intent. (It would be possible to generalize to structs, but not obviously net desirable.) This adds a level of indentation, so the diff here is going to be
easier to read in [ignore-whitespace mode](https://github.com/rust-lang/rust/commit/b0d3d3b9?w=1).
Pietro Albini [Thu, 25 Oct 2018 12:31:07 +0000 (14:31 +0200)]
Rollup merge of #55247 - peterjoel:peterjoel-prim-char-doc-example, r=joshtriplett
Clarified code example in char primitive doc
The example was not as clear as it could be because it was making an assumption about the structure of the data in order to multiply the number of elements in the slice by the item size. This change demonstrates the idea more straightforwardly, without needing a calculation, by just comparing the size of the slices.
Changes:
````
new_ret_no_self: add sample from #3313 to Known Problems section.
Support multiline comments and hopefully fix panic
Check for comments in collapsible ifs
Resolve ICE in needless range loop lint
RIIR update_lints: Update changelog links
Rename if_let_redundant_pattern_matching to redundant_pattern_matching
Add lint for redundant pattern matching for explicit return boolean
Fix issue #3322: reword help message for len_zero
Simplify manual_memcpy suggestion in some cases
Fix dogfood
Update known problems for unnecessary_fold
RIIR update_lints: Replace lint count in README.md
Rename `active_lints` to `usable_lints`
Add comment on WalkDir vs. fs::read_dir
sort_by -> sort_by_key
Some more documentation for clippy_dev
Use `WalkDir` to also gather from subdirectories
Avoid linting `boxed_local` on trait implementations.
Website: Make lint categories linkable
Restore clippy_dummy's placeholder name
Swap order of methods in `needless_range_loop` suggestion in some cases
Revert "Exclude pattern guards from unnecessary_fold lint"
Exclude pattern guards from unnecessary_fold lint
````
Pietro Albini [Thu, 25 Oct 2018 12:31:04 +0000 (14:31 +0200)]
Rollup merge of #55200 - octronics:gh51430, r=kennytm
Documents `From` implementations for `Stdio`
This PR solves part of #51430 by adding a basic summary and an example to each `impl From` inside `process` module (`ChildStdin`, `ChildStdout`, `ChildStderr`, `File`).
It does not document if the conversions allocate memory and how expensive they are.
Pietro Albini [Thu, 25 Oct 2018 12:31:01 +0000 (14:31 +0200)]
Rollup merge of #55138 - zackmdavis:the_paren_trap, r=pnkfelix
in which unused-parens suggestions heed what the user actually wrote
Aaron Hill pointed out that unnecessary parens around a macro call (paradigmatically, `format!`) yielded a suggestion of hideous macro-expanded code. `span_to_snippet` is fallable as far as the type system is concerned, so the pretty-printing can live on in the oft-neglected `else` branch.
Pietro Albini [Thu, 25 Oct 2018 12:30:59 +0000 (14:30 +0200)]
Rollup merge of #54965 - chathaway-codes:update-tcp-stream-docs, r=GuillaumeGomez
update tcp stream documentation
A small styling issue that seemed inconsistent here when compared to other places (such as https://doc.rust-lang.org/beta/std/net/struct.TcpListener.html).
I'm working on adding new keywords to the documentation and refreshing the incomplete older ones, and I'm hoping that I can eventually add all the standalone-usable keywords after a bunch of incremental work. It would be cool to see the keywords section of std's docs be a definitive reference as to what each keyword means when you see it, and that's what I'm aiming towards with this work.
I'm far from a Rust expert so there will inevitably be things to fix in this, also I'm not sure if this should be a bunch of quickly-merged PRs or one gradually-updated PR that gets merged once it's done.
Ralf Jung [Thu, 25 Oct 2018 09:39:54 +0000 (11:39 +0200)]
Remove is_null
It was confusingly named (`is_zero` would have been better), and it didn't even
reliably test for "is this value 0 at run-time" because out-of-bounds pointers
*can* be 0.
bors [Thu, 25 Oct 2018 09:18:17 +0000 (09:18 +0000)]
Auto merge of #54658 - petrochenkov:experelude, r=nikomatsakis
Add `extern crate` items to extern prelude
With this patch each `extern crate orig_name as name` item adds name `name` into the extern prelude, as if it was passed with `--extern`.
What changes this causes in practice?
Almost none! After all, `--extern` passed from Cargo was supposed to replace `extern crate` items in source, so if some code has `extern crate` item (or had it on 2015 edition), then it most likely uses `--extern` as well...
... with exception of a few important cases.
- Crates using `proc_macro`. `proc_macro` is not passed with `--extern` right now and is therefore not in extern prelude.
Together with 2018 edition import behavior this causes problems like https://github.com/rust-lang/rust/issues/54418, e.g.
```rust
extern crate proc_macro;
use proc_macro::TokenStream;
```
doesn't work.
It starts working after this patch.
- `#[no_std]` crates using `std` conditionally, like @aturon described in https://github.com/rust-lang/rust/issues/53166#issuecomment-425219286, and still wanting to write `std` instead of `crate::std`. This PR covers that case as well.
This allows us to revert placing `std` into the extern prelude unconditionally, which was, I think, a [bad idea](https://github.com/rust-lang/rust/issues/53166#issuecomment-425117829).
- Later `extern crate` syntax can be extended to support adding an alias to some local path to extern prelude, as it may be required for resolving https://github.com/rust-lang/rust/issues/54647.
Notes:
- Only `extern crate` items from the root module added to the prelude, mostly because this behavior for items from inner modules would look very strange, rather than for technical reasons.
This means you can opt out from the prelude additions with something like
```rust
mod inner {
pub(crate) extern crate foo;
}
use inner::foo;
```
- I haven't updated logic for 2018 import canaries to work fully correctly with this. The cases where it matters are pretty exotic (the `extern crate` item must be "sufficiently macro expanded") and I'd rather spend the time on eliminating the canaries entirely.
Niko Matsakis [Wed, 24 Oct 2018 16:08:34 +0000 (12:08 -0400)]
port the relate-types code from NLL type-check into a type-op
Add regression tests for #55219 and #55241
Also another test where a duplicate-like error appears to have been
suppressed; I'm not 100% sure why this output changes, though I could
imagine that some duplicate suppression is enabled by this PR.
Niko Matsakis [Tue, 23 Oct 2018 14:30:41 +0000 (10:30 -0400)]
check the self type is well-formed
This fixes `issue-28848.rs` -- it also handles another case that the
AST region checker gets wrong (`wf-self-type.rs`). I don't actually
think that this is the *right way* to be enforcing this constraint --
I think we should probably do it more generally, perhaps by editing
`predicates_of` for the impl itself. The chalk-style implied bounds
setup ought to fix this.
bors [Mon, 22 Oct 2018 03:41:28 +0000 (03:41 +0000)]
Auto merge of #55224 - kryptan:master, r=matthewjasper
Use a keyword in raw identifier example
That's a very small documentation fix. The text says "you can now use keywords as identifiers" but example didn't use a keyword and would work without raw identifiers.
Zack M. Davis [Sun, 21 Oct 2018 22:37:01 +0000 (15:37 -0700)]
only issue "variant of the expected type" suggestion for enums
Felix S. Klock II pointed out that this suggestion (introduced in
pull-request #43178 / eac74104) was being issued for one-field-struct
expected types (in which case it is misleading and outright wrong),
even though it was only intended for one-field enum-variants (most
notably, `Some`). Particularly tender-hearted code-historians may be
inclined to show mercy towards the author of #43178 on the grounds
that it's somewhat confusing that struct field definitions are given
in a type called `ty::VariantDef`.
Add a conditional to adhere to the original intent. (It would be
possible to generalize to structs, but not obviously net desirable.)
This adds a level of indentation, so the diff here is going to be
easier to read in ignore-whitespace mode (`-w`).
Peter Hall [Sun, 21 Oct 2018 17:53:09 +0000 (18:53 +0100)]
Clarified code example
The example was not as clear as it could be because it was making an assumption about the structure of the data in order to multiply the number of collection elements by the item size. This change demonstrates the idea more straightforwardly, without the calculation.
Changes:
````
new_ret_no_self: add sample from #3313 to Known Problems section.
Support multiline comments and hopefully fix panic
Check for comments in collapsible ifs
Resolve ICE in needless range loop lint
RIIR update_lints: Update changelog links
Rename if_let_redundant_pattern_matching to redundant_pattern_matching
Add lint for redundant pattern matching for explicit return boolean
Fix issue #3322: reword help message for len_zero
Simplify manual_memcpy suggestion in some cases
Fix dogfood
Update known problems for unnecessary_fold
RIIR update_lints: Replace lint count in README.md
Rename `active_lints` to `usable_lints`
Add comment on WalkDir vs. fs::read_dir
sort_by -> sort_by_key
Some more documentation for clippy_dev
Use `WalkDir` to also gather from subdirectories
Avoid linting `boxed_local` on trait implementations.
Website: Make lint categories linkable
Restore clippy_dummy's placeholder name
Swap order of methods in `needless_range_loop` suggestion in some cases
Revert "Exclude pattern guards from unnecessary_fold lint"
Exclude pattern guards from unnecessary_fold lint
````
bors [Sun, 21 Oct 2018 12:04:25 +0000 (12:04 +0000)]
Auto merge of #55069 - matthewjasper:explain-free-region-liveness, r=nikomatsakis
[NLL] Use new region infer errors when explaining borrows
Use the new free region infer errors for explaining borrows
This gives at least some explanation for why a borrow is expected to
last for a certain free region. Also:
* Reports E0373: "closure may outlive the current function" with NLL.
* Special cases the case of returning a reference to (or value referencing) a local variable or temporary (E0515).
* Special case assigning a reference to a local variable in a closure to a captured variable. (E0521)
Closes #51026 - `regions-nested-fns-2.rs` isn't changed to that diagnostic, since that would not be the correct error here.
Closes #51169
cc #53882 - The error is (IMO) better now, but it could be better when we trace lifetimes in these error messages.
Matthew Jasper [Sun, 14 Oct 2018 14:12:02 +0000 (15:12 +0100)]
Use new region infer errors for explaining borrows
This gives at least some explanation for why a borrow is expected to
last for a certain free region. Also:
* Reports E0373: "closure may outlive the current function" with NLL.
* Special cases the case of returning a reference to (or value
referencing) a local variable or temporary (E0515).
* Special case assigning a reference to a local variable in a closure
to a captured variable.
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