std::format and core::write macros' docs linked to core::fmt for format string reference, even though only std::fmt has format string documentation and the link titles were std::fmt.
Constantify more BTreeMap and BTreeSet functions
Just because we can:
- `BTreeMap::len`
- `BTreeMap::is_empty`
- `BTreeSet::len`
- `BTreeSet::is_empty`
Note that I put the `const` under `const_btree_new`, because I don't think their is a need to create another feature flag for that.
cc #71835
x.py setup: Create config.toml in the current directory, not the top-level directory
See https://github.com/rust-lang/rust/issues/78509 for discussion.
r? @pnkfelix
cc @cuviper @Mark-Simulacrum
make exp_m1 and ln_1p examples more representative of use
With this PR, the examples for `exp_m1` would fail if `x.exp() - 1.0` is used instead of `x.exp_m1()`, and the examples for `ln_1p` would fail if `(x + 1.0).ln()` is used instead of `x.ln_1p()`.
Add std::panic::panic_any.
The discussion of #67984 lead to the conclusion that there should be a macro or function separate from `std::panic!()` for throwing arbitrary payloads, to make it possible to deprecate or disallow (in edition 2021) `std::panic!(arbitrary_payload)`.
Alternative names:
- `panic_with!(..)`
- ~~`start_unwind(..)`~~ (panicking doesn't always unwind)
- `throw!(..)`
- `panic_throwing!(..)`
- `panic_with_value(..)`
- `panic_value(..)`
- `panic_with(..)`
- `panic_box(..)`
- `panic(..)`
The equivalent (private, unstable) function in `libstd` is called `std::panicking::begin_panic`.
I suggest `panic_any`, because it allows for any (`Any + Send`) type.
_Tracking issue: #78500_
Fix some more clippy warnings
Found while working on https://github.com/rust-lang/rust/pull/77351. It turns out that `x.py clippy --fix` does work on that branch as long as you pass `CARGOFLAGS=--lib`.
Avoid BorrowMutError with RUSTC_LOG=debug
```console
$ touch empty.rs
$ env RUSTC_LOG=debug rustc +stage1 --crate-type=lib empty.rs
```
Fails with a `BorrowMutError` because source map files are already
borrowed while `features_query` attempts to format a log message
containing a span.
Release the borrow before the query to avoid the issue.
Simplify a nested bool match
Logically this first eliminates the innermost match by merging the patterns.
Then, in a second step, turns the newly innermost match into a `matches!` call.
Always record reference to binding in match if guards
When encountering a binding from a `match` pattern in its `if` guard when computing a generator's interior types, we must always record the type of a reference to the binding because of how `if` guards are lowered to MIR. This was missed in #75213 because the binding in that test case was autorefed and we recorded that adjusted type anyway.
Fixes#78366
