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FusedIterator is a marker trait that promises that the implementing
iterator continues to return `None` from `.next()` once it has returned
`None` once (and/or `.next_back()`, if implemented).
The effects of FusedIterator are already widely available through
`.fuse()`, but with stable `FusedIterator`, stable Rust users can
implement this trait for their iterators when appropriate.
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Also adds #![deny(missing_debug_implementations)] so they don't get
missed again.
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Like #43008 (f668999), but _much more aggressive_.
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Use custom closure structs for the predicates so that the iterator's
clone can simply be derived. This should also reduce virtual call
overhead by not using function pointers.
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Original headline of SplitWhitespace's description is more descriptive as to what it contains and iterates over.
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It was only accessible through the `#[unstable]` crate std_unicode.
It has never been used in the compiler or standard library
since 47e7a05a28c9662159af2d2e0f2b7efc13fa09cb added it in 2012
“for OS API interop”.
It can be replaced with a one-liner:
```rust
fn is_utf16(slice: &[u16]) -> bool {
std::char::decode_utf16(s.iter().cloned()).all(|r| r.is_ok())
}
```
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… instead of one of each of libcore and libstd_unicode.
Move the `utf8_char_width` function to `core::str`
under the `str_internals` unstable feature.
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Fixes #26554.
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