72a25d05bf
This updates the standard library's documentation to use the new syntax. The documentation is worthwhile to update as it should be more idiomatic (particularly for features like this, which are nice for users to get acquainted with). The general codebase is likely more hassle than benefit to update: it'll hurt git blame, and generally updates can be done by folks updating the code if (and when) that makes things more readable with the new format. A few places in the compiler and library code are updated (mostly just due to already having been done when this commit was first authored).
22 lines
643 B
Rust
22 lines
643 B
Rust
use crate::iter::FromIterator;
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/// Collapses all unit items from an iterator into one.
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///
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/// This is more useful when combined with higher-level abstractions, like
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/// collecting to a `Result<(), E>` where you only care about errors:
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///
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/// ```
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/// use std::io::*;
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/// let data = vec![1, 2, 3, 4, 5];
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/// let res: Result<()> = data.iter()
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/// .map(|x| writeln!(stdout(), "{x}"))
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/// .collect();
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/// assert!(res.is_ok());
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/// ```
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#[stable(feature = "unit_from_iter", since = "1.23.0")]
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impl FromIterator<()> for () {
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fn from_iter<I: IntoIterator<Item = ()>>(iter: I) -> Self {
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iter.into_iter().for_each(|()| {})
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}
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}
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