This PR reverts RUST-147622 for several reasons:
1. The RUST-147622 PR would format the generated core library code using
an arbitrary `rustfmt` picked up from `PATH`, which will cause
hard-to-debug failures when the `rustfmt` used to format the
generated unicode data code versus the `rustfmt` used to format the
in-tree library code.
2. Previously, the `unicode-table-generator` tests were not run under CI
as part of `coretests`, and since for `x86_64-gnu-aux` job we run
library `coretests` with `miri`, the generated tests unfortunately
caused an unacceptably large Merge CI time regression from ~2 hours
to ~3.5 hours, making it the slowest Merge CI job (and thus the new
bottleneck).
3. This PR also has an unintended effect of causing a diagnostic
regression (RUST-148387), though that's mostly an edge case not
properly handled by `rustc` diagnostics.
Given that these are three distinct causes with non-trivial fixes, I'm
proposing to revert this PR to return us to baseline. This is not
prejudice against relanding the changes with these issues addressed, but
to alleviate time pressure to address these non-trivial issues.
`unicode_data` refactors
Minor refactors to `unicode_data` that occured to me while trying to reduce the size of the tables. Splitting into a separate PR. NFC
Instead of generating a standalone executable to test `unicode_data`,
generate normal tests in `coretests`. This ensures tests are always
generated, and will be run as part of the normal testsuite.
Also change the generated tests to loop over lookup tables, rather than
generating a separate `assert_eq!()` statement for every codepoint. The
old approach produced a massive (20,000 lines plus) file which took
minutes to compile!
core: simplify `Extend` for tuples
This is an alternative to https://github.com/rust-lang/rust/pull/137400. The current macro is incredibly complicated and introduces subtle bugs like calling the `extend_one` of the individual collections in backwards order. This PR drastically simplifies the macro by removing recursion and moving the specialization out of the macro. It also fixes the ordering issue described above (I've stolen the test of the new behaviour from https://github.com/rust-lang/rust/pull/137400). Additionally, the 1-tuple is now special-cased to allow taking advantage of the well-optimized `Extend` implementations of the individual collection.
f16_f128: enable some more tests in Miri
For some reason, a bunch of tests were disabled in Miri that don't use any fancy intrinsics. Let's enable them.
I verified this with `./x miri library/core --no-doc -- float`.
r? `@tgross35`
Improve `core::ptr` coverage
This PR improves the `core::ptr` coverage by adding a new test to `coretests` for the `<*const T>::is_aligned_to` method.
r? libs
Remove `div_rem` from `core::num::bignum`
This fixes very old fixme that sounds like this
```
Stupid slow base-2 long division taken from
https://en.wikipedia.org/wiki/Division_algorithm
FIXME use a greater base ($ty) for the long division.
```
By deleting this method since it was never used
Improve `core::hash` coverage
This PR improves the `core::hash` coverage by adding a new test to `coretests` and extending one of the existing tests to use 128-bit integers
r? libs
Improve `alloc::Layout` coverage
This PR improves the `core::alloc` coverage by adding a new test to `coretests` that cover the `Layout` methods when they error.
Tracking issue: https://github.com/rust-lang/rust/issues/55724
Unify and deduplicate bits conv float tests
cc rust-lang/rust#141726
This is a proposal to unify and deduplicate the bits conv tests for f16, f32, f64 and f128
