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r=fee1-dead
Unconditionally-const supertraits are considered not dyn compatible
Let's save some space in the design of const traits by making `dyn Trait` where `trait Trait: const Super` not dyn compatible.
Such a trait cannot satisfy `dyn Trait: Trait`; we could in the future make this dyn compatible but *NOT* implement `Trait`, but that's a bit weird and seems like it needs to be independently justified moving forward.
Fixes https://github.com/rust-lang/rust/issues/145198
r? fee1-dead
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Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>
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This is a technically a breaking change for what can be parsed in
`#[cfg(false)]`.
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Gate const trait syntax
Missed this during my review of rust-lang/rust#143879, huge apologies!
Fixes [after beta backport] https://github.com/rust-lang/rust/issues/144958.
cc ``@fee1-dead``
r? ``@BoxyUwU`` or anyone
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Add regression tests for seemingly fixed issues
Closes rust-lang/rust#104314
Closes rust-lang/rust#125866
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Adds the equivalent `nonpoison` types to the `poison::mutex` module.
These types and implementations are gated under the `nonpoison_mutex`
feature gate.
Also blesses the ui tests that now have a name conflicts (because these
types no longer have unique names). The full path distinguishes the
different types.
Co-authored-by: Aandreba <aandreba@gmail.com>
Co-authored-by: Trevor Gross <tmgross@umich.edu>
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Stop compilation early if macro expansion failed
Fixes rust-lang/rust#116180.
So there isn't really a type that is central for macro expansion and some errors are actually emitted (because the resolution happens after the expansion I suppose) after the expansion pass (like "not found macro"). Sometimes, errors are only emitted on the second "try" (to improve error output). So I couldn't reach a similar solution than what was done in https://github.com/rust-lang/rust/pull/133937 and suggested by ````@estebank```` in https://github.com/rust-lang/rust/issues/116180#issuecomment-3109468922. But maybe I missed something?
So in the end, I realized that there is method called every time (except one, described below) a macro error is actually emitted: `ExtCtxt::trace_macros_diag`. Considering I updated what it did, I renamed it into `macro_error_and_trace_macros_diag` to better reflect it.
There is only one call of `trace_macros_diag` which isn't reporting an error but just used for `macro_trace` feature, so I kept it as is.
r? ````@oli-obk````
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More robustly deal with relaxed bounds and improve their diagnostics
Scaffolding for https://github.com/rust-lang/rust/issues/135229 (CC https://github.com/rust-lang/rust/pull/135331)
Fixes https://github.com/rust-lang/rust/issues/136944 (6th commit).
Fixes https://github.com/rust-lang/rust/issues/142718 (8th commit).
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Make slice comparisons const
This needed a fix for `derive_const`, too, as it wasn't usable in libcore anymore as trait impls need const stability attributes. I think we can't use the same system as normal trait impls while `const_trait_impl` is still unstable.
r? ```@fee1-dead```
cc rust-lang/rust#143800
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Also make it *only* usable on nightly
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r=oli-obk
Dont collect assoc ty item bounds from trait where clause for host effect predicates
For background, we uplift `where Self::Assoc: Trait` bounds in a trait's where clauses into *item bounds* on `type Assoc;`. This is because before we *had* syntactical item bounds, users would express their item bounds like so.
Let's opt out of doing this same behavior for `HostEffect` predicates like `where Self::Assoc: [const] Trait`. I left a comment in the code:
```rust
// FIXME(const_trait_impl): We *could* uplift the
// `where Self::Assoc: [const] Trait` bounds from the parent trait
// here too, but we'd need to split `const_conditions` into two
// queries (like we do for `trait_explicit_predicates_and_bounds`)
// since we need to also filter the predicates *out* of the const
// conditions or they lead to cycles in the trait solver when
// utilizing these bounds. For now, let's do nothing.
```
As an aside, this was an ICE that was only triggerable when building libraries and not binaries because we never were calling `tcx.ensure_ok().explicit_implied_const_bounds(def_id);` on associated types like we should have been. I adjusted the calls to `ensure_ok` to make sure this happens, so we catch bugs like this in the future more easily.
As another aside, I fixed the bound uplifting logic for *always const* predicates, since those act like normal clauses and have no notion of conditional constness.
r? ```@oli-obk``` ```@fee1-dead``` or anyone really
Fixes rust-lang/rust#133275
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Preserve constness in trait objects up to hir ty lowering
r? ``@compiler-errors``
While we don't support `dyn const Trait`, we can at least also inform the user that `const Trait` is only legal for `#[const_trait] trait Trait {}`
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update issue number for `const_trait_impl`
r? project-const-traits
cc rust-lang/rust#67792 rust-lang/rust#143874
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predicates
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constify `From` and `Into`
tracking issue rust-lang/rust#143773
r? ``````@fee1-dead``````
I did not mark any impls elsewhere as `const`, those can happen on their own timeframe and don't need to be part of this MVP. But if there are some core ones you think should be in there I'll happily add them, just couldn't think of any
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New tracking issues for const_ops and const_cmp
Let's do a clean start with new tracking issues to avoid mixing things up with the previous constification.
I assume the fact that the `PartialEq` *trait* and *impls* used different feature names was a mistake (the feature name on the impl is entirely irrelevant anyway).
Part of https://github.com/rust-lang/rust/issues/143800, https://github.com/rust-lang/rust/issues/143802
r? ``@oli-obk``
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Constify `Fn*` traits
r? `@compiler-errors` `@fee1-dead`
this should unlock a few things. A few `const_closures` tests have broken even more than before, but that feature is marked as incomplete anyway
cc rust-lang/rust#67792
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Full list of `impl const Default` types:
- ()
- bool
- char
- Cell
- std::ascii::Char
- usize
- u8
- u16
- u32
- u64
- u128
- i8
- i16
- i32
- i64
- i128
- f16
- f32
- f64
- f128
- std::marker::PhantomData<T>
- Option<T>
- std::iter::Empty<T>
- std::ptr::Alignment
- &[T]
- &mut [T]
- &str
- &mut str
- String
- Vec<T>
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Most macro tests use `macro` in the name, making it easy to find and run
tests relevant to macros. However, a few use `mbe` instead. Rename those
to say `macro`.
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Assemble const bounds via normal item bounds in old solver too
Fixes the first example in https://rust-lang.zulipchat.com/#narrow/channel/144729-t-types/topic/elaboration.20of.20const.20bounds.3F/with/526378135
The code duplication here is not that nice, but it's at least very localized.
cc `@davidtwco`
r? oli-obk
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`TyCtxt::def_descr`
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