Cautiously add IntoIterator for arrays by value
Add the attribute described in #84133, `#[rustc_skip_array_during_method_dispatch]`, which effectively hides a trait from method dispatch when the receiver type is an array.
Then cherry-pick `IntoIterator for [T; N]` from #65819 and gate it with that attribute. Arrays can now be used as `IntoIterator` normally, but `array.into_iter()` has edition-dependent behavior, returning `slice::Iter` for 2015 and 2018 editions, or `array::IntoIter` for 2021 and later.
r? `@nikomatsakis`
cc `@LukasKalbertodt` `@rust-lang/libs`
"semantic equivalence" is too strong a phrasing here, which is why
actually explaining what kind of circumstances might produce a -0
was chosen instead.
Add array search aliases
Missed this in https://github.com/rust-lang/rust/pull/80068. This one will really fix https://github.com/rust-lang/rust/issues/46075.
The last alias especially I'm a little unsure about - maybe fuzzy search should be fixed in rustdoc instead? Happy to make that change although I'd have to figure out how.
r? ``@m-ou-se`` although cc ``@GuillaumeGomez`` for the search issue.
This reverts commit 7e2548fe69.
Now I know why it was redefined: it seems like it's potentially because
of the orphan rule. Here are the error messages:
error[E0119]: conflicting implementations of trait `std::fmt::Debug` for type `!`:
--> src/primitive_docs.rs:236:1
|
6 | impl Debug for ! {
| ^^^^^^^^^^^^^^^^
|
= note: conflicting implementation in crate `core`:
- impl std::fmt::Debug for !;
error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> src/primitive_docs.rs:236:1
|
6 | impl Debug for ! {
| ^^^^^^^^^^^^^^^-
| | |
| | `!` is not defined in the current crate
| impl doesn't use only types from inside the current crate
|
= note: define and implement a trait or new type instead
Document that slice refers to any pointer type to a sequence
I was recently confused about the way slices are represented in memory. The necessary information was not available in the std-docs directly, but was a mix of different material from the reference and book.
This PR should clear up the definition of slices a bit more in the documentation. Especially the fact that the term slice refers to the pointer/reference type, e.g. `&[T]`, and not `[T]`.
It also documents that slice pointers are twice the size of pointers to `Sized` types, as this concept may be unfamiliar to users coming from other languages that do not have the concept of "fat pointers" (especially C/C++).
I've documented why this was important to me and my findings in [this blog post](https://codecrash.me/understanding-rust-slices).
r? @lcnr
