Dylan DPC 4ed8fa4759
Rollup merge of #100872 - JanBeh:PR_vec_default_alloc_doc, r=fee1-dead
Add guarantee that Vec::default() does not alloc

Currently `Vec::new()` is guaranteed to not allocate until elements are pushed onto the `Vec`, but such a guarantee is missing for `Vec`'s implementation of `Default::default`.

This adds such a guarantee for `Vec::default()` to the API reference.

See also [this discussion on URLO](https://users.rust-lang.org/t/guarantee-that-vec-default-does-not-allocate/79903).
2022-08-22 20:34:16 +05:30
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