Dylan DPC
7c55c992ab
Rollup merge of #101807 - jackh726:no-gat-defaults, r=lcnr
...
Disallow defaults on type GATs
Fixes #99205
2022-09-17 15:31:08 +05:30
Dylan DPC
4c64c14420
Rollup merge of #101790 - TaKO8Ki:do-not-suggest-placeholder-to-const-and-static-without-type, r=compiler-errors
...
Do not suggest a placeholder to const and static without a type
Fixes #101755
2022-09-17 15:31:08 +05:30
Dylan DPC
cbd561d41f
Rollup merge of #98441 - calebzulawski:simd_as, r=oli-obk
...
Implement simd_as for pointers
Expands `simd_as` (and `simd_cast`) to handle pointer-to-pointer, pointer-to-integer, and integer-to-pointer conversions.
cc ``@programmerjake`` ``@thomcc``
2022-09-17 15:31:07 +05:30
Dylan DPC
3ad81e0dd8
Rollup merge of #93628 - est31:stabilize_let_else, r=joshtriplett
...
Stabilize `let else`
🎉 **Stabilizes the `let else` feature, added by [RFC 3137](https://github.com/rust-lang/rfcs/pull/3137 ).** 🎉
Reference PR: https://github.com/rust-lang/reference/pull/1156
closes #87335 (`let else` tracking issue)
FCP: https://github.com/rust-lang/rust/pull/93628#issuecomment-1029383585
----------
## Stabilization report
### Summary
The feature allows refutable patterns in `let` statements if the expression is
followed by a diverging `else`:
```Rust
fn get_count_item(s: &str) -> (u64, &str) {
let mut it = s.split(' ');
let (Some(count_str), Some(item)) = (it.next(), it.next()) else {
panic!("Can't segment count item pair: '{s}'");
};
let Ok(count) = u64::from_str(count_str) else {
panic!("Can't parse integer: '{count_str}'");
};
(count, item)
}
assert_eq!(get_count_item("3 chairs"), (3, "chairs"));
```
### Differences from the RFC / Desugaring
Outside of desugaring I'm not aware of any differences between the implementation and the RFC. The chosen desugaring has been changed from the RFC's [original](https://rust-lang.github.io/rfcs/3137-let-else.html#reference-level-explanations ). You can read a detailed discussion of the implementation history of it in `@cormacrelf` 's [summary](https://github.com/rust-lang/rust/pull/93628#issuecomment-1041143670 ) in this thread, as well as the [followup](https://github.com/rust-lang/rust/pull/93628#issuecomment-1046598419 ). Since that followup, further changes have happened to the desugaring, in #98574 , #99518 , #99954 . The later changes were mostly about the drop order: On match, temporaries drop in the same order as they would for a `let` declaration. On mismatch, temporaries drop before the `else` block.
### Test cases
In chronological order as they were merged.
Added by df9a2e0687#87688 ):
* [`ui/pattern/usefulness/top-level-alternation.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/pattern/usefulness/top-level-alternation.rs ) to ensure the unreachable pattern lint visits patterns inside `let else`.
Added by 5b95df4bdc#87688 ):
* [`ui/let-else/let-else-bool-binop-init.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-bool-binop-init.rs ) to ensure that no lazy boolean expressions (using `&&` or `||`) are allowed in the expression, as the RFC mandates.
* [`ui/let-else/let-else-brace-before-else.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-brace-before-else.rs ) to ensure that no `}` directly preceding the `else` is allowed in the expression, as the RFC mandates.
* [`ui/let-else/let-else-check.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-check.rs ) to ensure that `#[allow(...)]` attributes added to the entire `let` statement apply for the `else` block.
* [`ui/let-else/let-else-irrefutable.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-irrefutable.rs ) to ensure that the `irrefutable_let_patterns` lint fires.
* [`ui/let-else/let-else-missing-semicolon.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-missing-semicolon.rs ) to ensure the presence of semicolons at the end of the `let` statement.
* [`ui/let-else/let-else-non-diverging.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-non-diverging.rs ) to ensure the `else` block diverges.
* [`ui/let-else/let-else-run-pass.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-run-pass.rs ) to ensure the feature works in some simple test case settings.
* [`ui/let-else/let-else-scope.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-scope.rs ) to ensure the bindings created by the outer `let` expression are not available in the `else` block of it.
Added by bf7c32a447#89965 ):
* [`ui/let-else/issue-89960.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/issue-89960.rs ) as a regression test for the ICE-on-error bug #89960 . Later in 102b9125e1856541963c#89974 ):
* [`ui/let-else/let-else-if.rs`](https://github.com/rust-lang/rust/blob/1.58.1/src/test/ui/let-else/let-else-if.rs ) to test for the improved error message that points out that `let else if` is not possible.
Added by 9b45713b6chttps://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-allow-unused.rs ) as a regression test for #89807 , to ensure that `#[allow(...)]` attributes added to the entire `let` statement apply for bindings created by the `let else` pattern.
Added by 61bcd8d307#89841 ):
* [`ui/let-else/let-else-non-copy.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-non-copy.rs ) to ensure that a copy is performed out of non-copy wrapper types. This mirrors `if let` behaviour. The test case bases on rustc internal changes originally meant for #89933 but then removed from the PR due to the error prior to the improvements of #89841 .
* [`ui/let-else/let-else-source-expr-nomove-pass.rs `](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-source-expr-nomove-pass.rs ) to ensure that while there is a move of the binding in the successful case, the `else` case can still access the non-matching value. This mirrors `if let` behaviour.
Added by 102b9125e1#89841 ):
* [`ui/let-else/let-else-ref-bindings.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-ref-bindings.rs ) and [`ui/let-else/let-else-ref-bindings-pass.rs `](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-ref-bindings-pass.rs ) to check `ref` and `ref mut` keywords in the pattern work correctly and error when needed.
Added by 2715c5f984#89841 ):
* Match ergonomic tests adapted from the `rfc2005` test suite.
Added by fec8a507a2#89841 ):
* [`ui/let-else/let-else-deref-coercion-annotated.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-deref-coercion-annotated.rs ) and [`ui/let-else/let-else-deref-coercion.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-deref-coercion.rs ) to check deref coercions.
#### Added since this stabilization report was originally written (2022-02-09)
Added by 76ea566677#94211 ):
* [`ui/let-else/let-else-destructuring.rs`](https://github.com/rust-lang/rust/blob/1.63.0/src/test/ui/let-else/let-else-destructuring.rs ) to give a nice error message if an user tries to do an assignment with a (possibly refutable) pattern and an `else` block, like asked for in #93995 .
Added by e7730dcb7e#94208 ):
* [`ui/let-else/let-else-allow-in-expr.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-allow-in-expr.rs ) to test whether `#[allow(unused_variables)]` works in the expr, as well as its non presence, as well as putting it on the entire `let else` *affects* the expr, too. This was adding a missing test as pointed out by the stabilization report.
* Expansion of `ui/let-else/let-else-allow-unused.rs` and `ui/let-else/let-else-check.rs` to ensure that non-presence of `#[allow(unused)]` does issue the unused lint. This was adding a missing test case as pointed out by the stabilization report.
Added by 5bd71063b3#94208 ):
* [`ui/let-else/let-else-slicing-error.rs`](https://github.com/rust-lang/rust/blob/1.61.0/src/test/ui/let-else/let-else-slicing-error.rs ), a regression test for #92069 , which got fixed without addition of a regression test. This resolves a missing test as pointed out by the stabilization report.
Added by 5374688e1d#98574 ):
* [`src/test/ui/async-await/async-await-let-else.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/async-await/async-await-let-else.rs ) to test the interaction of async/await with `let else`
Added by 6c529ded86#98574 ):
* [`src/test/ui/let-else/let-else-temporary-lifetime.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs ) as a (partial) regression test for #98672
Added by 9b56640106#99518 ):
* [`src/test/ui/let-else/let-else-temp-borrowck.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs ) as a regression test for #93951
* Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a partial regression test for #98672 (especially regarding `else` drop order)
Added by baf9a7cb57#99518 ):
* Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a partial regression test for #93951 , similar to `let-else-temp-borrowck.rs`
Added by 60be2de8b7#99518 ):
* Extension of `src/test/ui/let-else/let-else-temporary-lifetime.rs` to include a program that can now be compiled thanks to borrow checker implications of #99518
Added by 47a7a91c96#100132 ):
* [`src/test/ui/let-else/issue-100103.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-100103.rs ), as a regression test for #100103 , to ensure that there is no ICE when doing `Err(...)?` inside else blocks.
Added by e3c5bd617d#100443 ):
* [`src/test/ui/let-else/let-else-then-diverge.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-then-diverge.rs ), to verify that there is no unreachable code error with the current desugaring.
Added by 981852677c#100443 ):
* [`src/test/ui/let-else/issue-94176.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-94176.rs ), to make sure that a correct span is emitted for a missing trailing expression error. Regression test for #94176 .
Added by e182d12a84#100434 ):
* [src/test/ui/unpretty/pretty-let-else.rs](https://github.com/rust-lang/rust/blob/master/src/test/ui/unpretty/pretty-let-else.rs ), as a regression test to ensure pretty printing works for `let else` (this bug surfaced in many different ways)
Added by e26285603c#99954 ):
* [`src/test/ui/let-else/let-else-temporary-lifetime.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-temporary-lifetime.rs ) extended to contain & borrows as well, as this was identified as an earlier issue with the desugaring: https://github.com/rust-lang/rust/issues/98672#issuecomment-1200196921
Added by 2d8460ef43#99291 ):
* [`src/test/ui/let-else/let-else-drop-order.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/let-else-drop-order.rs ) a matrix based test for various drop order behaviour of `let else`. Especially, it verifies equality of `let` and `let else` drop orders, [resolving](https://github.com/rust-lang/rust/pull/93628#issuecomment-1238498468 ) a [stabilization blocker](https://github.com/rust-lang/rust/pull/93628#issuecomment-1055738523 ).
Added by 1b87ce0d40#101410 ):
* Edit to `src/test/ui/let-else/let-else-temporary-lifetime.rs` to add the `-Zvalidate-mir` flag, as a regression test for #99228
Added by af591ebe4d#101410 ):
* [`src/test/ui/let-else/issue-99975.rs`](https://github.com/rust-lang/rust/blob/master/src/test/ui/let-else/issue-99975.rs ) as a regression test for the ICE #99975 .
Added by this PR:
* `ui/let-else/let-else.rs`, a simple run-pass check, similar to `ui/let-else/let-else-run-pass.rs`.
### Things not currently tested
* ~~The `#[allow(...)]` tests check whether allow works, but they don't check whether the non-presence of allow causes a lint to fire.~~ → *test added by e7730dcb7eb29a10ee73f269f4dc6e9d606db0da*
* ~~There is no `#[allow(...)]` test for the expression, as there are tests for the pattern and the else block.~~ → *test added by e7730dcb7eb29a10ee73f269f4dc6e9d606db0da*
* ~~`let-else-brace-before-else.rs` forbids the `let ... = {} else {}` pattern and there is a rustfix to obtain `let ... = ({}) else {}`. I'm not sure whether the `.fixed` files are checked by the tooling that they compile. But if there is no such check, it would be neat to make sure that `let ... = ({}) else {}` compiles.~~ → *test added by e7730dcb7eb29a10ee73f269f4dc6e9d606db0da*
* ~~#92069 got closed as fixed, but no regression test was added. Not sure it's worth to add one.~~ → *test added by 5bd71063b3810d977aa376d1e6dd7cec359330cc*
* ~~consistency between `let else` and `if let` regarding lifetimes and drop order: https://github.com/rust-lang/rust/pull/93628#issuecomment-1055738523~~ → *test added by 2d8460ef43d902f34ba2133fe38f66ee8d2fdafc*
Edit: they are all tested now.
### Possible future work / Refutable destructuring assignments
[RFC 2909](https://rust-lang.github.io/rfcs/2909-destructuring-assignment.html ) specifies destructuring assignment, allowing statements like `FooBar { a, b, c } = foo();`.
As it was stabilized, destructuring assignment only allows *irrefutable* patterns, which before the advent of `let else` were the only patterns that `let` supported.
So the combination of `let else` and destructuring assignments gives reason to think about extensions of the destructuring assignments feature that allow refutable patterns, discussed in #93995 .
A naive mapping of `let else` to destructuring assignments in the form of `Some(v) = foo() else { ... };` might not be the ideal way. `let else` needs a diverging `else` clause as it introduces new bindings, while assignments have a default behaviour to fall back to if the pattern does not match, in the form of not performing the assignment. Thus, there is no good case to require divergence, or even an `else` clause at all, beyond the need for having *some* introducer syntax so that it is clear to readers that the assignment is not a given (enums and structs look similar). There are better candidates for introducer syntax however than an empty `else {}` clause, like `maybe` which could be added as a keyword on an edition boundary:
```Rust
let mut v = 0;
maybe Some(v) = foo(&v);
maybe Some(v) = foo(&v) else { bar() };
```
Further design discussion is left to an RFC, or the linked issue.
2022-09-17 15:31:06 +05:30
bors
c524c7dd25
Auto merge of #98588 - b-naber:valtrees-cleanup, r=lcnr
...
Use only ty::Unevaluated<'tcx, ()> in type system
r? `@lcnr`
2022-09-17 03:04:22 +00:00
bors
4d4e51e428
Auto merge of #101902 - jackh726:revert-static-hrtb-error, r=nikomatsakis
...
Partially revert #101433
reverts #101433 to fix #101844
We should get this into the beta cut, since the ICE is getting hit quite a bit.
2022-09-16 16:46:14 +00:00
Jack Huey
92b759f517
Revert "Better errors for implied static bound"
...
This reverts commit c75817b0a7
2022-09-16 09:47:07 -04:00
Dylan DPC
edf9e5eb63
Rollup merge of #101753 - oli-obk:tait_closure_args, r=compiler-errors
...
Prefer explict closure sig types over expected ones
fixes #100800
Previously we only checked that given closure arguments are equal to expected closure arguments, but now we choose the given closure arguments for the signature that is used when type checking the closure body, and keep the other signature for the type of the closure as seen outside of it.
2022-09-16 11:17:01 +05:30
Takayuki Maeda
527292a1a6
do not suggest a placeholder to const and static without a type
2022-09-16 11:24:14 +09:00
est31
173eb6f407
Only enable the let_else feature on bootstrap
...
On later stages, the feature is already stable.
Result of running:
rg -l "feature.let_else" compiler/ src/librustdoc/ library/ | xargs sed -s -i "s#\\[feature.let_else#\\[cfg_attr\\(bootstrap, feature\\(let_else\\)#"
2022-09-15 21:06:45 +02:00
Ding Xiang Fei
635b57c2ed
enclose else block in terminating scope
2022-09-15 10:08:12 +08:00
Ding Xiang Fei
34f0c4502f
supplement for the missing or incomplete comments
2022-09-15 10:08:11 +08:00
Ding Xiang Fei
1b87ce0d40
reorder nesting scopes and declare bindings without drop schedule
2022-09-15 10:07:54 +08:00
bors
6153d3cbe6
Auto merge of #101212 - eholk:dyn-star, r=compiler-errors
...
Initial implementation of dyn*
This PR adds extremely basic and incomplete support for [dyn*](https://smallcultfollowing.com/babysteps//blog/2022/03/29/dyn-can-we-make-dyn-sized/ ). The goal is to get something in tree behind a flag to make collaboration easier, and also to make sure the implementation so far is not unreasonable. This PR does quite a few things:
* Introduce `dyn_star` feature flag
* Adds parsing for `dyn* Trait` types
* Defines `dyn* Trait` as a sized type
* Adds support for explicit casts, like `42usize as dyn* Debug`
* Including const evaluation of such casts
* Adds codegen for drop glue so things are cleaned up properly when a `dyn* Trait` object goes out of scope
* Adds codegen for method calls, at least for methods that take `&self`
Quite a bit is still missing, but this gives us a starting point. Note that this is never intended to become stable surface syntax for Rust, but rather `dyn*` is planned to be used as an implementation detail for async functions in dyn traits.
Joint work with `@nikomatsakis` and `@compiler-errors.`
r? `@bjorn3`
2022-09-14 18:10:51 +00:00
Jack Huey
d657d1f4a1
Disallow defaults on type GATs
2022-09-14 13:03:01 -04:00
Dylan DPC
430123164f
Rollup merge of #101433 - jackh726:better-static-placeholder-error, r=compiler-errors
...
Emit a note that static bounds from HRTBs are a bug
This note isn't perfect, but opening this to either 1) land as is or 2) get some feedback on how to improve it
Let r? `@compiler-errors` and cc. `@nikomatsakis`
2022-09-14 19:26:18 +05:30
Oli Scherer
7794ea5854
Prefer explict closure sig types over expected ones
2022-09-14 10:44:56 +00:00
bors
a0d1df4a5d
Auto merge of #101709 - nnethercote:simplify-visitors-more, r=cjgillot
...
Simplify visitors more
A successor to #100392 .
r? `@cjgillot`
2022-09-14 05:21:14 +00:00
Jack Huey
c75817b0a7
Better errors for implied static bound
2022-09-13 20:18:04 -04:00
Eric Holk
cf04547b0b
Address code review comments
2022-09-13 14:50:12 -07:00
b-naber
a4bbb8db5c
use ty::Unevaluated<'tcx, ()> in type system
2022-09-13 17:40:59 +02:00
bors
1ce51982b8
Auto merge of #101615 - compiler-errors:rpitit-perf, r=oli-obk
...
Make `compare_predicate_entailment` no longer a query
Make `compare_predicate_entailment` so it's no longer a query (again), and splits out the new logic (that equates the return types to infer RPITITs) into its own query. This means that this new query (now called `collect_trait_impl_trait_tys`) is no longer executed for non-RPITIT cases.
This should improve perf (https://github.com/rust-lang/rust/pull/101224#issuecomment-1241682203 ), though in practice we see that these some crates remain from the primary regressions list on the original report... They are all <= 0.43% regression and seemingly only on the incr-full scenario for all of them.
I am at a loss for what might be causing this regression other than what I fixed here, since we don't introduce much new non-RPITIT logic except for some `def_kind` query calls in some places, for example, like projection. Maybe that's it?
----
Originally this PR was opened to test enabling `cache_on_disk` (62164aaaa11) but that didn't turn out to be very useful (https://github.com/rust-lang/rust/pull/101615#issuecomment-1242403205 ), so that led me to just split the query (and rename the PR).
2022-09-13 15:33:06 +00:00
Eric Holk
3c2d20ef0b
Make x.py check work
2022-09-12 17:29:11 -07:00
Michael Goulet
b2ed2dcaae
Rename some variants
2022-09-12 16:55:59 -07:00
Eric Holk
549c105bb3
dyn* through more typechecking and MIR
2022-09-12 16:55:56 -07:00
Eric Holk
7fccac3ea0
Typecheck dyn* coercions
...
Also changes things to treat dyn* as a sized type, unlike dyn Trait.
2022-09-12 16:55:56 -07:00
Eric Holk
6c01273a15
Plumb dyn trait representation through ty::Dynamic
2022-09-12 16:55:55 -07:00
Guillaume Gomez
b7504d6f4f
Rollup merge of #100185 - compiler-errors:issue-100183, r=wesleywiser
...
Fix `ReErased` leaking into typeck due to `typeof(...)` recovery
Fixes #100183
2022-09-12 22:47:13 +02:00
bors
7f115e3cd2
Auto merge of #101716 - Dylan-DPC:rollup-ayvh6nd, r=Dylan-DPC
...
Rollup of 9 pull requests
Successful merges:
- #100293 (Add inline-llvm option for disabling/enabling LLVM inlining)
- #100767 (Remove manual <[u8]>::escape_ascii)
- #101668 (Suggest pub instead of public for const type item)
- #101671 (Fix naming format of IEEE 754 standard)
- #101676 (Check that the types in return position `impl Trait` in traits are well-formed)
- #101681 (Deny return-position `impl Trait` in traits for object safety)
- #101693 (Update browser UI test 0 10)
- #101701 (Rustdoc-Json: Add tests for trait impls.)
- #101706 (rustdoc: remove no-op `#search`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
2022-09-12 13:16:14 +00:00
Dylan DPC
5faf033f62
Rollup merge of #101676 - compiler-errors:rpitit-wf, r=lcnr
...
Check that the types in return position `impl Trait` in traits are well-formed
This effectively duplicates `check_associated_type_bounds`, but that shouldn't be for long, since we're going to remove it once we refactor RPITITs into regular associated items.
Fixes #101663
---
We don't check
```rust
trait Foo {
fn bar() -> impl ?Sized;
}
```
currently, but that's for a different reason, which is that we don't currently check that a trait function's return type is sized (i.e. `fn bar() -> [u8]` also works in a trait).
2022-09-12 15:21:33 +05:30
bors
a93214ec06
Auto merge of #101604 - compiler-errors:issue-101465, r=lcnr
...
Fix ICE in opt_suggest_box_span
We were _totally_ mishandling substs and obligations in `opt_suggest_box_span`, so I reworked that function pretty heavily.
Also some drive-by changes, namely removing `ret_type_span`.
Fixes #101465
2022-09-12 08:46:40 +00:00
bors
56e7678ca9
Auto merge of #100502 - chenyukang:fix-100478, r=jackh726
...
Avoid infinite loop in function arguments checking
Fixes #100478
Fixes #101097
2022-09-12 06:05:32 +00:00
Nicholas Nethercote
7e3fd33a66
Remove unused argument from visit_poly_trait_ref.
2022-09-12 13:51:10 +10:00
Michael Goulet
5599a45e58
Fix ICE in opt_suggest_box_span
2022-09-12 02:00:20 +00:00
Michael Goulet
0a605d33cd
No more ret_type_span
2022-09-12 02:00:20 +00:00
Michael Goulet
fd2766e7fd
Check that the types in RPITITs are WF
2022-09-11 06:58:11 +00:00
bors
2287107588
Auto merge of #98559 - jackh726:remove-reempty, r=oli-obk
...
Remove ReEmpty
r? rust-lang/types
2022-09-10 20:54:01 +00:00
Dylan DPC
f1412a665f
Rollup merge of #101614 - compiler-errors:rpitit-eq, r=jackh726
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Equate fn outputs when inferring RPITIT hidden types
When we are trying to infer the hidden types for RPITITs, we need to equate the output tys instead of just subtyping them. For example:
```rust
trait Foo { fn bar() -> impl Sized {} }
impl Foo for () { fn bar() -> &'static str { "" } }
```
If we just subtype the signatures `fn() -> &'static str <: fn() -> _#1t` (where `_#1t` is the variable we've used to infer `impl Sized`), we'll end up `&'static str <: _#1t`, which causes us to infer `_#1t = #'_#2r str`, where `'_#2r` is unconstrained, which gets fixed up to `ReEmpty`, and which is certainly not what we want.
I can't actually think of a way to make this fail to compile, because during borrowck we've already done the method probe, and so we just look at the `impl` method signature and see the `&'static str` any time we call `<() as Foo>::bar()`. But this _does_ cause the ICE [here](https://github.com/rust-lang/rust/pull/98559#issuecomment-1241891994 ) in `@jackh726's` "Remove ReEmpty" PR (#98559 ) to stop ICEing, because after that PR we were leaking unconstrained region variables into the typeck results.
r? types
2022-09-10 18:56:08 +05:30
bors
5197c96c49
Auto merge of #101483 - oli-obk:guaranteed_opt, r=fee1-dead
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The `<*const T>::guaranteed_*` methods now return an option for the unknown case
cc https://github.com/rust-lang/rust/issues/53020#issuecomment-1236932443
I chose `0` for "not equal" and `1` for "equal" and left `2` for the unknown case so backends can just forward to raw pointer equality and it works ✨
r? `@fee1-dead` or `@lcnr`
cc `@rust-lang/wg-const-eval`
2022-09-10 09:50:21 +00:00
bors
cedd26b1ea
Auto merge of #99916 - dpaoliello:stablizerawdylib, r=wesleywiser
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Stabilize raw-dylib for non-x86
This stabilizes the `raw-dylib` and `link_ordinal` features (#58713 ) for non-x86 architectures (i.e., `x86_64`, `aarch64` and `thumbv7a`):
* Marked the `raw_dylib` feature as `active`.
* Marked the `link_ordinal` attribute as `ungated`.
* Added new errors if either feature is used on x86 targets without the `raw_dylib` feature being enabled.
* Updated tests to only set the `raw_dylib` feature when building for x86.
2022-09-10 04:14:34 +00:00
Michael Goulet
bec079d1a9
split compare_predicate_entailment and collect_trait_impl_trait_tys out
2022-09-10 02:49:14 +00:00
Daniel Paoliello
c7475011a3
Stabilze raw-dylib for non-x86
2022-09-09 15:38:15 -07:00
Dylan DPC
ae4973281b
Rollup merge of #101573 - lcnr:param-kind-ord, r=BoxyUwU
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update `ParamKindOrd`
https://github.com/rust-lang/rust/pull/90207#discussion_r767160854 😁
writing comments "for future prs" sure works well :3
r? `@BoxyUwU`
2022-09-09 22:02:18 +05:30
Dylan DPC
bef48f9314
Rollup merge of #101492 - TaKO8Ki:suggest-adding-array-length-to-ref-to-array, r=oli-obk
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Suggest adding array lengths to references to arrays if possible
ref: https://github.com/rust-lang/rust/pull/100590#pullrequestreview-1096851146
2022-09-09 22:02:16 +05:30
Michael Goulet
022e3fe550
Equate fn outputs when inferring RPITIT hidden types
2022-09-09 16:14:59 +00:00
Oli Scherer
f632dbe46f
The <*const T>::guaranteed_* methods now return an option for the unknown case
2022-09-09 15:16:04 +00:00
bors
4a09adf99f
Auto merge of #101603 - matthiaskrgr:rollup-8y6kf20, r=matthiaskrgr
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Rollup of 6 pull requests
Successful merges:
- #99207 (Enable eager checks for memory sanitizer)
- #101253 (fix the suggestion of format for asm_sub_register)
- #101450 (Add `const_extern_fn` to 1.62 release notes.)
- #101556 (Tweak future opaque ty pretty printing)
- #101563 (Link UEFI target documentation from target list)
- #101593 (Cleanup themes (tooltip))
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
2022-09-09 06:24:25 +00:00
Matthias Krüger
0354eee4c6
Rollup merge of #101253 - lyming2007:issue-101163, r=Amanieu
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fix the suggestion of format for asm_sub_register
modified: compiler/rustc_typeck/src/check/intrinsicck.rs
modified: src/test/ui/asm/bad-template.aarch64_mirunsafeck.stderr
modified: src/test/ui/asm/bad-template.aarch64_thirunsafeck.stderr
modified: src/test/ui/asm/bad-template.x86_64_mirunsafeck.stderr
modified: src/test/ui/asm/bad-template.x86_64_thirunsafeck.stderr
modified: src/test/ui/asm/type-check-1.rs
modified: src/test/ui/asm/type-check-1.stderr
modified: src/test/ui/asm/x86_64/type-check-3.stderr
2022-09-09 07:02:30 +02:00
chenyukang
7e7dfb83dc
fix #101097 , avoid infinite loop in fn arguments checking
2022-09-09 09:51:21 +08:00
Michael Goulet
6876c94d80
Fix documentation lint failures
2022-09-09 01:31:46 +00:00
