See its documentation for more

inline(never) is better way to avoid optimizer to inline the function instead of cold.

- Reflect changes in x.py defaults
- Remove recommendation to use nightly for incremental; it works fine on
beta
- Remove note that incremental chooses stage 1 by default; stage 1 is
already the default
- Update Discord -> Zulip

Make the following methods of `Duration` unstable const under `duration_const_2`:
 - `from_secs_f64`
 - `from_secs_f32`
 - `mul_f64`
 - `mul_f32`
 - `div_f64`
 - `div_f32`

This results in all methods of `Duration` being (unstable) const.

Also adds tests for these methods in a const context, moved the test to `library` as part of rust-lang#76268.

Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const.

Tracking issue: rust-lang#72440

…est in Miri

Add more info for Vec Drain doc

See its documentation for more

Vec slice example fix style and show type elision

Use inline(never) instead of cold

inline(never) is better way to avoid optimizer to inline the function instead of cold.

…orse

Make all methods of `Duration` unstably const

Make the following methods of `Duration` unstable const under `duration_const_2`:
 - `from_secs_f64`
 - `from_secs_f32`
 - `mul_f64`
 - `mul_f32`
 - `div_f64`
 - `div_f32`

This results in all methods of `Duration` being (unstable) const.

Moved the tests to `library` as part of rust-lang#76268.

Possible because of rust-lang#72449, which made the relevant `f32` and `f64` methods const.

Tracking issue: rust-lang#72440

r? @ecstatic-morse

…ary, r=jyn514

Add Arith Tests in Library

Added Arith Tests library as a part of rust-lang#76268

r? @matklad

…sts_library, r=jyn514

Move Various str tests in library

Moved various string ui  tests in library  as a part of rust-lang#76268

r? @matklad

Add doc comments for From impls

rust-lang#51430

…ulacrum

Update bootstrap readme

- Reflect changes in x.py defaults
- Remove recommendation to use nightly for incremental; it works fine on
beta
- Remove note that incremental chooses stage 1 by default; stage 1 is
already the default
- Update Discord -> Zulip

r? @Mark-Simulacrum

Some cleanup changes and commenting

r? @nikomatsakis
Cc @eddyb

…lacrum

Fix liballoc test suite for Miri

Mostly, fix the regression introduced by rust-lang#75207 that caused slices (i.e., references) to be created to invalid memory or memory that has aliasing pointers that we want to keep valid. @dylni  this changes the type of `check_range` to only require the length, not the full reference to the slice, which indeed is all the information this function requires.

Also reduce the size of a test introduced in rust-lang#70793 to make it not take 3 minutes in Miri.

This makes https://github.com/RalfJung/miri-test-libstd work again.