Jonathan Brouwer 3605c1f769 Rollup merge of #156644 - bjoernager:widening-mul, r=clarfonthey ...

Widen the result of `widening_mul`.

Tracking issue: rust-lang/rust#152016

This PR implements <https://github.com/rust-lang/rust/issues/152016#issuecomment-3843258926>, which mandates that `widening_mul` return a single, scalar value rather than a low/high tuple.

Consequently, this method is removed from `u128` and `i128` as they are the widest integral types. It has also been removed from `usize` and `isize` due to portability concerns.

Existing `widening_mul` usage has been replaced by equivalent calls to `carrying_mul` (which is logically identical to the old behaviour.) Existing &ndash; generic &ndash; non-doc tests have been removed.

# Public API

```rust
impl u8 {
    pub const fn widening_mul(self, rhs: Self) -> u16;
}

impl u16 {
    pub const fn widening_mul(self, rhs: Self) -> u32;
}

impl u32 {
    pub const fn widening_mul(self, rhs: Self) -> u64;
}

impl u64 {
    pub const fn widening_mul(self, rhs: Self) -> u128;
}

impl i8 {
    pub const fn widening_mul(self, rhs: Self) -> i16;
}

impl i16 {
    pub const fn widening_mul(self, rhs: Self) -> i32;
}

impl i32 {
    pub const fn widening_mul(self, rhs: Self) -> i64;
}

impl i64 {
    pub const fn widening_mul(self, rhs: Self) -> i128;
}
```

2026-05-18 17:07:11 +02:00

..

src

Rollup merge of #156644 - bjoernager:widening-mul, r=clarfonthey

2026-05-18 17:07:11 +02:00

Cargo.toml

add autodiff examples

2025-11-16 23:35:37 -05:00