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move `considering_regions` to the infcx
it seems weird to prove some obligations which constrain inference vars while ignoring regions in a context which considers regions. This is especially weird because even for a fulfillment context with ignored regions, we still added region outlives bounds when directly relating regions.
tbh our handling of regions is still very weird, but at least this is a step in the right direction imo.
r? rust-lang/types
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Fix `remap_constness`
`~const Drop` was renamed to `~const Destruct` and this special case should
be removed
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Rewrite `orphan_check_trait_ref` to use a `TypeVisitor`
The current impl is far more confusing than it has any right to be :sparkles:
r? rust-lang/types
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couple of clippy::perf fixes
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`~const Drop` was renamed to `~const Destruct` and this special case should
be removed
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WARNING: might have perf implications.
Are there any more problems with having a constness
in the `ParamEnv` now? :)
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Avoid `Symbol` to `&str` conversions
`Symbol::as_str` is a slowish operation, so this patch removes some usages of it.
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Add E0790 as more specific variant of E0283
Fixes #81701
I think this should be good to go, there are only two things where I am somewhat unsure:
- Is there a better way to get the fully-qualified path for the suggestion? I tried `self.tcx.def_path_str`, but that didn't seem to always give a correct path for the context.
- Should all this be extracted into it's own method or is it fine where it is?
r? `@estebank`
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`replace_bound_vars` fast path: check predicates, don't check consts
split out from #98900
`ty::Const` doesn't have precomputed type flags, so
computing `has_vars_bound_at_or_above` for constants
requires us to visit the const and its contained types
and constants. A noop fold should be pretty much equally as
fast so removing it prevents us from walking the constant twice
in case it contains bound vars.
r? `@jackh726`
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`arena > Rc` for query results
The `Rc`s have to live for the whole duration as their count cannot go below 1 while stored as part of the query results.
By storing them in an arena we should save a bit of memory because we don't have as many independent allocations and also don't have to clone the `Rc` anymore.
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Don't pass InferCtxt to WfPredicates
Simple cleanup. Infer vars will get passed up as obligations and shallowed resolved later. This actually improves one test output.
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Revert "Highlight conflicting param-env candidates"
This reverts #98794, commit 08135254dcf22be0d5661ea8f75e703b29a83514.
Seems to have caused an incremental compilation bug. The root cause of the incr comp bug is somewhat unrelated but is triggered by this PR, so I don't feel comfortable with having this PR in the codebase until it can be investigated further. Fixes #99233.
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trait obligations for binops.
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This reverts commit 08135254dcf22be0d5661ea8f75e703b29a83514.
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Better error message for generic_const_exprs inference failure
Fixes #90531
This code:
```rs
#![feature(generic_const_exprs)]
fn foo<const N: usize>(_arr: [u64; N + 1]) where [u64; N + 1]: {}
fn main() {
let arr = [5; 5];
foo(arr);
}
```
Will now emit the following error:
```rs
warning: the feature `generic_const_exprs` is incomplete and may not be safe to use and/or cause compiler crashes
--> test.rs:1:12
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1 | #![feature(generic_const_exprs)]
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= note: `#[warn(incomplete_features)]` on by default
= note: see issue #76560 <https://github.com/rust-lang/rust/issues/76560> for more information
error[E0284]: type annotations needed
--> test.rs:8:7
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8 | foo(arr);
| ^^^ cannot infer the value of the const parameter `N` declared on the function `foo`
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note: required by a bound in `foo`
--> test.rs:3:56
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3 | fn foo<const N: usize>(_arr: [u64; N + 1]) where [u64; N + 1]: {}
| ^^^^^ required by this bound in `foo`
help: consider specifying the generic argument
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8 | foo::<N>(arr);
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error: aborting due to previous error; 1 warning emitted
```
cc: `@lcnr` thanks a lot again for the help on this
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Move abstract const to middle
Moves AbstractConst (and all associated methods) to rustc middle for use in `rustc_infer`.
This allows for const resolution in infer to use abstract consts to walk consts and check if
they are resolvable.
This attempts to resolve the issue where `Foo<{ concrete const }, generic T>` is incorrectly marked as conflicting, and is independent from the other issue where nested abstract consts must be resolved.
r? `@lcnr`
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Rollup of 5 pull requests
Successful merges:
- #97720 (Always create elided lifetime parameters for functions)
- #98315 (Stabilize `core::ffi:c_*` and rexport in `std::ffi`)
- #98705 (Implement `for<>` lifetime binder for closures)
- #99126 (remove allow(rustc::potential_query_instability) in rustc_span)
- #99139 (Give a better error when `x dist` fails for an optional tool)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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`ty::Const` doesn't have precomputed type flags, so
computing `has_vars_bound_at_or_above` for constants
requires us to visit the const and its contained types
and constants. A noop fold should be pretty much equally as
fast so removing it prevents us from walking the constant twice
in case it contains bound vars.
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Implement `for<>` lifetime binder for closures
This PR implements RFC 3216 ([TI](https://github.com/rust-lang/rust/issues/97362)) and allows code like the following:
```rust
let _f = for<'a, 'b> |a: &'a A, b: &'b B| -> &'b C { b.c(a) };
// ^^^^^^^^^^^--- new!
```
cc ``@Aaron1011`` ``@cjgillot``
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This is no longer used only for debugging options (e.g. `-Zoutput-width`, `-Zallow-features`).
Rename it to be more clear.
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Lower let-else in MIR
This MR will switch to lower let-else statements in MIR building instead.
To lower let-else in MIR, we build a mini-switch two branches. One branch leads to the matching case, and the other leads to the `else` block. This arrangement will allow temporary lifetime analysis running as-is so that the temporaries are properly extended according to the same rule applied to regular `let` statements.
cc https://github.com/rust-lang/rust/issues/87335
Fix #98672
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This helps bring `hir::Expr` size down, `Closure` was the biggest
variant, especially after `for<>` additions.
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