Tracking Issue for str::copy_from_str

Feature gate: #![feature(str_copy_from_str)]

This is a tracking issue for str::copy_from_str, which copies a same-length &str into a mutable str in place.

impl str {
    // Panics if `self.len() != src.len()`.
    pub fn copy_from_str(&mut self, src: &str);
}

None known. The ACP accepted copy_from_str and rejected copy_within; swap_with_str was left out pending a concrete use case.

Rollup merge of rust-lang#159846 - valentynkit:str-copy-from-str, r=j…

Rollup merge of #159846 - valentynkit:str-copy-from-str, r=jhpratt

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