Rollup of 9 pull requests #65793
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Rollup of 9 pull requests #65793
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Change-Id: Ib3a396e7334d209fe6c6ef425bbfc7b2ae471378
Change-Id: Ib3a396e7334d209fe6c6ef425bbfc7b2ae471378
This commit modifies the uninhabitedness checking so that the fields of a non-exhaustive variant (which is not local) are ignored if they are uninhabited. This is an improvement over the previous behaviour which considered all non-local non-exhaustive variants useful because unreachable patterns are now detected. Signed-off-by: David Wood <david@davidtw.co>
Add test for rejecting `trait A: B1 = B2;`. Also test rejection of `trait A: = B;`.
Also elaborate on some feature gates in `active.rs`.
Change-Id: Ib3a396e7334d209fe6c6ef425bbfc7b2ae471378
The iterator is implemented using const generics. It implements the traits `Iterator`, `DoubleEndedIterator`, `ExactSizeIterator`, `FusedIterator` and `TrustedLen`. It also contains a public method `new` to create it from an array. `IntoIterator` was not implemented for arrays yet, as there are still some open questions regarding backwards compatibility. This commit only adds the iterator impl and does not yet offer a convenient way to obtain that iterator.
Many tests are based on tests by Josh Stone <cuviper@gmail.com>
This it to make sure traits are implemented for arrays with length 32 and below, while they are not implemented for >= 33.
…=scottmcm
Add by-value iterator for arrays
This adds an iterator that can iterate over arrays by value, yielding all elements by value. However, **this PR does _not_ add a corresponding `IntoIterator` impl for arrays**. The `IntoIterator` impl needs some discussion about backwards-compatibility that should take place in a separate PR. With this patch, this code should work (but there is currently still a bug):
```rust
#![feature(array_value_iter)]
use std::array::IntoIter;
let arr = [1, 2, 3];
for x in IntoIter::new(arr) {
println!("{}", x);
}
```
**TODO**:
- [x] Get initial feedback
- [x] Add tests
- [x] Figure out why stage1 produces weird bugs ([comment](rust-lang#62959 (comment)))
- [x] Add UI tests as mentioned [here](rust-lang#62959 (comment)) (will do that soon-ish)
- [x] Fix [this new bug](rust-lang#62959 (comment))
**Notes for reviewers**
- Is the use of `MaybeUninit` correct here? I think it has to be used due to the `Clone` impl which has to fill the dead array elements with something, but cannot fill it with a correct instance.
- Are the unit tests sufficient?
CC rust-lang#25725
…-E0576, r=matthewjasper,kinnison Add long error explanation for E0576 Part of rust-lang#61137.
…k-Simulacrum reorder config.toml.example options and add one missing option r? @Mark-Simulacrum
…e-always-useful, r=varkor ignore uninhabited non-exhaustive variant fields Fixes rust-lang#65157. This PR modifies the uninhabitedness checking so that the fields of a non-exhaustive variant (which is not local) are ignored if they are uninhabited. This is an improvement over the previous behaviour which considered all non-local non-exhaustive variants useful because unreachable patterns are now detected. r? @arielb1 cc @varkor
Deprecated proc_macro doesn't trigger warning on build library Fix rust-lang#65189
…r=davidtwco Pre-expansion gate most of the things This is a subset of rust-lang#64672. A crater run has already been done and this PR implements conclusions according to rust-lang#64672 (comment). r? @davidtwco cc @petrochenkov
Adjust the tracking issue for `untagged_unions`. Makes rust-lang#55149 the new tracking issue for `untagged_unions`. Closes rust-lang#32836 which is the old tracking issue. r? @varkor
Changed APIT with explicit generic args span to specific arg spans Fixes rust-lang#65642.
Fix more `ReEmpty` ICEs closes rust-lang#65553 r? @pnkfelix
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@bors r+ p=9 rollup=never |
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📌 Commit 100c924 has been approved by |
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Rollup of 9 pull requests Successful merges: - #62959 (Add by-value iterator for arrays ) - #65390 (Add long error explanation for E0576) - #65408 (reorder config.toml.example options and add one missing option) - #65414 (ignore uninhabited non-exhaustive variant fields) - #65666 (Deprecated proc_macro doesn't trigger warning on build library) - #65742 (Pre-expansion gate most of the things) - #65747 (Adjust the tracking issue for `untagged_unions`.) - #65763 (Changed APIT with explicit generic args span to specific arg spans) - #65775 (Fix more `ReEmpty` ICEs) Failed merges: - #65519 (trait-based structural match implementation) r? @ghost
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☀️ Test successful - checks-azure |
This was referenced Oct 25, 2019
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This was referenced Oct 26, 2019
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Successful merges:
untagged_unions. #65747 (Adjust the tracking issue foruntagged_unions.)ReEmptyICEs #65775 (Fix moreReEmptyICEs)Failed merges:
r? @ghost