This will let people make calls like random(1..=6), and allows for
future expansion to non-uniform distributions, as well as
floating-point.
For now, this is only implemented for `RangeFull`, to get the interface
in place. Subsequent commits will implement it for other range types.
Implement `Random` for tuple
Implement `Random` for tuples of arity 12 or less. Each element is expected to implement `Random`.
I think it's OK to implement this trait for the following types:
- Primitive integer types and `bool`
- Arrays and tuples of the above values
- ~~`NonZero<T>`~~, `Saturating<T>` and `Wrapping<T>`
The necessity of this trait is debated (<https://github.com/rust-lang/rust/issues/130703#issuecomment-2508889577>), but if we decide to keep it in the future when the `random` module is stabilized, I think it would be useful to have this trait implemented for tuples.
Tracking issue: #130703
r? `@joboet`
As core uses an extern type (`ptr::VTable`), the default `?Sized` to
`MetaSized` migration isn't sufficient, and some code that previously
accepted `VTable` needs relaxed to continue to accept extern types.
Similarly, the compiler uses many extern types in `rustc_codegen_llvm`
and in the `rustc_middle::ty::List` implementation (`OpaqueListContents`)
some bounds must be relaxed to continue to accept these types.
Unfortunately, due to the current inability to relax `Deref::Target`,
some of the bounds in the standard library are forced to be stricter than
they ideally would be.
Remove an unneeded helper from the tuple library code
Thanks to https://github.com/rust-lang/rust/pull/107022, this is just what `==` does, so we don't need the helper here anymore.
[`RFC 3086`] Attempt to try to resolve blocking concerns
Implements what is described at https://github.com/rust-lang/rust/issues/83527#issuecomment-1744822345 to hopefully make some progress.
It is unknown if such approach is or isn't desired due to the lack of further feedback, as such, it is probably best to nominate this PR to the official entities.
`@rustbot` labels +I-compiler-nominated
This commit adds a new unstable attribute, `#[doc(tuple_varadic)]`, that
shows a 1-tuple as `(T, ...)` instead of just `(T,)`, and links to a section
in the tuple primitive docs that talks about these.
