1. Err on unions on derive where it's required.
2. Err on `#[derive(Default)]` on enums without `#[default]` variant.
3. Don't add where bounds `T: Default` when expanding `Default` on enums (structs need that, enums not).
Also, because I was annoyed by that, in minicore, add a way to filter on multiple flags in the line-filter (`// :`). This is required for the `Debug` and `Hash` derives, because the derive should be in the prelude but the trait not.
We used to point to the entire macro call including its token tree if we couldn't upmap the diagnostic to the input
This generally makes things very noisy as the entire macro call will turn red on errors.
Instead, we now macro the path and `!` (bang) token as the error source range which is a lot nicer on the eyes.
Stop backends from needing to support nullary intrinsics
And then remove our infrastructure special casing them. Further improvements can now be done to them by avoiding the intermediate ConstValue step, but let's leave that to follow up work
r? `@RalfJung`
Shallowly bail from `coerce_unsized` more
We do a *lot* of coercion in HIR typeck. Most of the time we're just coercing a type to itself, but we always try `coerce_unsized` even if it's not necessary.
Let's avoid doing that by adding a fast path to `coerce_unsized`; see the comment in that function.
Rollup of 4 pull requests
Successful merges:
- rust-lang/rust#142078 (Add SIMD funnel shift and round-to-even intrinsics)
- rust-lang/rust#142214 (`tests/ui`: A New Order [9/N])
- rust-lang/rust#142417 (`tests/ui`: A New Order [12/N])
- rust-lang/rust#143030 (Fix suggestion spans inside macros for the `unused_must_use` lint)
r? `@ghost`
`@rustbot` modify labels: rollup
Fix suggestion spans inside macros for the `unused_must_use` lint
This PR fixes the suggestion spans inside macros for the `unused_must_use` lint by trying to find the oldest ancestor span.
Fixes https://github.com/rust-lang/rust/issues/143025
`tests/ui`: A New Order [12/N]
Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.
r? `@jieyouxu`
Add SIMD funnel shift and round-to-even intrinsics
This PR adds 3 new SIMD intrinsics
- `simd_funnel_shl` - funnel shift left
- `simd_funnel_shr` - funnel shift right
- `simd_round_ties_even` (vector version of `round_ties_even_fN`)
TODO (future PR): implement `simd_fsh{l,r}` in miri, cg_gcc and cg_clif (it is surprisingly hard to implement without branches, the common tricks that rotate uses doesn't work because we have 2 elements now. e.g, the `-n&31` trick used by cg_gcc to implement rotate doesn't work with this because then `fshl(a, b, 0)` will be `a | b`)
[#t-compiler > More SIMD intrinsics](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/More.20SIMD.20intrinsics/with/522130286)
`@rustbot` label T-compiler T-libs A-intrinsics F-core_intrinsics
r? `@workingjubilee`
