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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.
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@ -2927,6 +2927,8 @@ unsafe impl<#[may_dangle] T, A: Allocator> Drop for Vec<T, A> {
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#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]
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impl<T> const Default for Vec<T> {
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/// Creates an empty `Vec<T>`.
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///
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/// The vector will not allocate until elements are pushed onto it.
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fn default() -> Vec<T> {
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Vec::new()
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}
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