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Implement the `!` type
This implements the never type (`!`) and hides it behind the feature gate `#[feature(never_type)]`. With the feature gate off, things should build as normal (although some error messages may be different). With the gate on, `!` is usable as a type and diverging type variables (ie. types that are unconstrained by anything in the code) will default to `!` instead of `()`.
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r=jonathandturner
Update E0302 to the new format
Part of #35233.
Fixes #35523.
r? @jonathandturner
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Split Ty::is_empty method into is_never and is_uninhabited
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Do not span across nodes for E0004
Part of #35233.
Fixes #35529.
r? @arielb1
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Update E0008 and E0007 to new format
Part of #35233
A fix for #35496
r? @jonathandturner
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Rollup of 15 pull requests
- Successful merges: #35371, #35396, #35446, #35449, #35452, #35458, #35465, #35466, #35470, #35475, #35477, #35484, #35504, #35507, #35524
- Failed merges: #35395, #35415
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r=jonathandturner
Turn on new errors and json mode
This PR is a big-switch, but on a well-worn path:
* Turns on new errors by default (and removes old skool)
* Moves json output from behind a flag
The RFC for new errors [landed](https://github.com/rust-lang/rfcs/pull/1644) and as part of that we wanted some bake time. It's now had a few weeks + all the time leading up to the RFC of people banging on it. We've also had [editors updating to the new format](https://github.com/saviorisdead/RustyCode/pull/159) and expect more to follow.
We also have an [issue on old skool](https://github.com/rust-lang/rust/issues/35330) that needs to be fixed as more errors are switched to the new style, but it seems silly to fix old skool errors when we fully intend to throw the switch in the near future.
This makes it lean towards "why not just throw the switch now, rather than waiting a couple more weeks?" I only know of vim that wanted to try to parse the new format but were not sure how, and I think we can reach out to them and work out something in the 8 weeks before this would appear in a stable release.
We've [hashed out](https://github.com/rust-lang/rust/issues/35330) stabilizing JSON output, and it seems like people are relatively happy making what we have v1 and then likely adding to it in the future. The idea is that we'd maintain backward compatibility and just add new fields as needed. We'll also work on a separate output format that'd be better suited for interactive tools like IDES (since JSON message can get a little long depending on the error).
This PR stabilizes JSON mode, allowing its use without `-Z unstable-options`
Combined, this gives editors two ways to support errors going forward: parsing the new error format or using the JSON mode. By moving JSON to stable, we can also add support to Cargo, which plugin authors tell us does help simplify their support story.
r? @nikomatsakis
cc @rust-lang/tools
Closes https://github.com/rust-lang/rust/issues/34826
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Address ICEs running w/ incremental compilation and building glium
Fixes for various ICEs I encountered trying to build glium with incremental compilation enabled. Building glium now works. Of the 4 ICEs, I have test cases for 3 of them -- I didn't isolate a test for the last commit and kind of want to go do other things -- most notably, figuring out why incremental isn't saving much *effort*.
But if it seems worthwhile and I can come back and try to narrow down the problem.
r? @michaelwoerister
Fixes #34991
Fixes #32015
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Err codes
r? @jonathandturner
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Update E0004 to use labels
Fixes #35191 and is part of #35233
"r? @jonathandturner
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Updated E0306 to new format.
Part of #35233.
Fixes #35315.
r? @jonathandturner
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Part of #35233
Fixes #35190
r? @jonathandturner
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We now detect inlined id's earlier (in the HIR map) and rewrite a read
of them to be a read of the metadata for the associated item.
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inlined HIR.
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Centralize and clean type error reporting
Refactors the code that handles type errors to be cleaner and fixes various edge cases.
This made the already-bad "type mismatch resolving" error message somewhat uglier. I want to fix that in another commit before this PR is merged.
Fixes #31173
r? @jonathandturner, cc @nikomatsakis
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I split the RFC1592 commit out
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Refactor constant evaluation to use a single error reporting function
that reports a type-error-like message.
Also, unify all error codes with the "constant evaluation error" message
to just E0080, and similarly for a few other duplicate codes. The old
situation was a total mess, and now that we have *something* we can
further iterate on the UX.
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rustc: Update stage0 to beta-2016-07-06
Hot off the presses, let's update our stage0 compiler!
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Hot off the presses, let's update our stage0 compiler!
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prefer `if let` to match with `None => {}` arm in some places
This is a spiritual succesor to #34268 / 8531d581, in which we replaced a
number of matches of None to the unit value with `if let` conditionals
where it was judged that this made for clearer/simpler code (as would be
recommended by Manishearth/rust-clippy's `single_match` lint). The same
rationale applies to matches of None to the empty block.
----
r? @jseyfried
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This is a spiritual succesor to #34268/8531d581, in which we replaced a
number of matches of None to the unit value with `if let` conditionals
where it was judged that this made for clearer/simpler code (as would be
recommended by Manishearth/rust-clippy's `single_match` lint). The same
rationale applies to matches of None to the empty block.
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Although the set of APIs being stabilized this release is relatively small, the
trains keep going! Listed below are the APIs in the standard library which have
either transitioned from unstable to stable or those from unstable to
deprecated.
Stable
* `BTreeMap::{append, split_off}`
* `BTreeSet::{append, split_off}`
* `Cell::get_mut`
* `RefCell::get_mut`
* `BinaryHeap::append`
* `{f32, f64}::{to_degrees, to_radians}` - libcore stabilizations mirroring past
libstd stabilizations
* `Iterator::sum`
* `Iterator::product`
Deprecated
* `{f32, f64}::next_after`
* `{f32, f64}::integer_decode`
* `{f32, f64}::ldexp`
* `{f32, f64}::frexp`
* `num::One`
* `num::Zero`
Added APIs (all unstable)
* `iter::Sum`
* `iter::Product`
* `iter::Step` - a few methods were added to accomodate deprecation of One/Zero
Removed APIs
* `From<Range<T>> for RangeInclusive<T>` - everything about `RangeInclusive` is
unstable
Closes #27739
Closes #27752
Closes #32526
Closes #33444
Closes #34152
cc #34529 (new tracking issue)
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Revert "skip double negation in const eval"
This reverts commit 735c018974e5570ea13fd887aa70a011a5b8e7b8.
fixes #34395
The original commit was based on a mis-understanding of the overflowing literal lint.
This needs to be ported to beta.
r? @eddyb
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This reverts commit 735c018974e5570ea13fd887aa70a011a5b8e7b8.
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Generalize and abstract `ThinAttributes` to `ThinVec<Attribute>`.
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Remove last traces of identifier hygiene from HIR
https://github.com/rust-lang/rust/pull/34095/commits/e783a0a5e39d5ae2fa147508197d09a51530fae8 removed the [last](https://github.com/rust-lang/rust/pull/33654#discussion_r63415218) [use](https://github.com/rust-lang/rust/pull/33654#discussion_r63416284) of hygiene at post-resolve compilation stages, so we can avoid renaming during lowering to HIR and just keep original names.
r? @nrc
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Support 16-bit pointers in MIR
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