Update LLVM used in x86 CI dist builds to `15.0.0`
LLVM 15.0.0 has been released, so we can use it in CI builds. We need (at least) LLVM 15 for BOLT, and we regularly update to most recent stable versions. It would also be good to first see the perf. effect of upgrading by itself, to have a better baseline for BOLT.
r? `@Mark-Simulacrum`
`To` is better than `Create` for indicating that this is a non-consuming
conversion, rather than creating something out of nothing.
And the addition of `Attr` is because the current names makes them sound
like they relate to `TokenStream`, but really they relate to
`AttrTokenStream`.
Cleanup themes (tooltip)
No changes in the UI. I used this opportunity to unify the dark theme with the others for the alpha parameter though.
r? `@notriddle`
Tweak future opaque ty pretty printing
1. The `Return` type of a generator doesn't need to be a lang item just for diagnostic printing of types
2. We shouldn't suppress the `Output = Ty` of a opaque future if the type is a int or float var.
Initial implementation of return-position `impl Trait` in traits
* Create a new item kind, called `ImplTraitPlaceholder`, which is used to lower `ast::TyKind::ImplTrait` in trait method returns.
* This item is the child of the trait method, which simplifies the way we calculate bounds and stuff.
* Use the def-id of this type to construct a projection type that we use during astconv for the return type of the trait method signature.
* Implement logic to normalize this `ImplTraitPlaceholder` projection type when we know its concrete impl (this is pretty limited currently, but really there are no other selection candidates that make sense -- for now!)
* Check that the `impl Trait`'s bounds are satisfied on the concrete type provided in the impl.
This is obviously nowhere near complete, but I wanted to at least get some initial support landed so we can start playing around with it.
What works:
* async fn in trait and RPITIT, including multiple `impl Trait`s and `impl Trait` nested in associated type bindings, like `impl Future<Output = impl Sized>`
These two type names are long and have long matching prefixes. I find
them hard to read, especially in combinations like
`AttrAnnotatedTokenStream::new(vec![AttrAnnotatedTokenTree::Token(..)])`.
This commit renames them as `AttrToken{Stream,Tree}`.
Reimplement `carrying_add` and `borrowing_sub` for signed integers.
As per the discussion in #85532, this PR reimplements `carrying_add` and `borrowing_sub` for signed integers.
It also adds unit tests for both unsigned and signed integers, emphasing on the behaviours of the methods.
Fix `range_{plus,minus}_one` bad suggestions
Fixes#9431.
The current `range_plus_one` and `range_minus_one` suggestions are completely incorrect when macros are involved.
This commit resolves this by disabling the lints for any range expression that is expanded from a macro. The reasons for this are that it is very difficult to create a correct suggestion in this case and that false negatives are less important for pedantic lints.
changelog: Fix `range_{plus,minus}_one` bad suggestions
