To my knowledge, the following code is intended to be legal:
fn main() {
let mut buf = String::with_capacity(11);
buf.push_str("hello");
let hello: &str = unsafe { &*(buf.as_str() as *const _) }; // laundering the lifetime -- we take care that `buf` does not reallocate, so that's okay.
buf.push_str(" world");
println!("{}", hello);
}
However, Miri currently flags this as UB.
I believe this is #60847, but for String. Discovered while writing this post.
cc @RalfJung
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