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Rollup merge of #88648 - kpreid:option, r=Mark-Simulacrum

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Correct “copies” to “moves” in `<Option<T> as From<T>>::from` doc, and other copyediting

The `impl<T> From<T> for Option<T>` has no `Copy` or `Clone` bound, so its operation is guaranteed to be a move. The call site might copy, but the function itself cannot.

Since that would have been a rather small PR, I also reviewed the other documentation in the file and made other improvements (in separate commits): adding periods and commas, linking `Deref::Target`, and clarifying what "a container" is in `FromIterator`.
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Jack Huey 2021-09-08 12:24:18 -04:00 committed by GitHub
commit 2bbcf929c6
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16
library/core/src/option.rs
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@ -1173,7 +1173,7 @@ impl<T> Option<T> {
// Entry-like operations to insert a value and return a reference
/////////////////////////////////////////////////////////////////////////
/// Inserts `value` into the option then returns a mutable reference to it.
/// Inserts `value` into the option, then returns a mutable reference to it.
///
/// If the option already contains a value, the old value is dropped.
///
@ -1397,7 +1397,7 @@ impl<T> Option<T> {
}
impl<T, U> Option<(T, U)> {
/// Unzips an option containing a tuple of two options
/// Unzips an option containing a tuple of two options.
///
/// If `self` is `Some((a, b))` this method returns `(Some(a), Some(b))`.
/// Otherwise, `(None, None)` is returned.
@ -1500,7 +1500,7 @@ impl<T: Clone> Option<&mut T> {
}
impl<T: Default> Option<T> {
/// Returns the contained [`Some`] value or a default
/// Returns the contained [`Some`] value or a default.
///
/// Consumes the `self` argument then, if [`Some`], returns the contained
/// value, otherwise if [`None`], returns the [default value] for that
@ -1561,7 +1561,7 @@ impl<T: DerefMut> Option<T> {
/// Converts from `Option<T>` (or `&mut Option<T>`) to `Option<&mut T::Target>`.
///
/// Leaves the original `Option` in-place, creating a new one containing a mutable reference to
/// the inner type's `Deref::Target` type.
/// the inner type's [`Deref::Target`] type.
///
/// # Examples
///
@ -1701,7 +1701,7 @@ impl<'a, T> IntoIterator for &'a mut Option<T> {
#[stable(since = "1.12.0", feature = "option_from")]
impl<T> From<T> for Option<T> {
/// Copies `val` into a new `Some`.
/// Moves `val` into a new [`Some`].
///
/// # Examples
///
@ -1942,8 +1942,8 @@ unsafe impl<A> TrustedLen for IntoIter<A> {}
impl<A, V: FromIterator<A>> FromIterator<Option<A>> for Option<V> {
/// Takes each element in the [`Iterator`]: if it is [`None`][Option::None],
/// no further elements are taken, and the [`None`][Option::None] is
/// returned. Should no [`None`][Option::None] occur, a container with the
/// values of each [`Option`] is returned.
/// returned. Should no [`None`][Option::None] occur, a container of type
/// `V` containing the values of each [`Option`] is returned.
///
/// # Examples
///
@ -2039,7 +2039,7 @@ impl<T> ops::FromResidual for Option<T> {
}
impl<T> Option<Option<T>> {
/// Converts from `Option<Option<T>>` to `Option<T>`
/// Converts from `Option<Option<T>>` to `Option<T>`.
///
/// # Examples
///