built from an iterator over elements of type `{A}`"]
pub trait FromIterator<A> {
/// Build a container with elements from something iterable.
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// use std::collections::HashSet;
+ /// use std::iter::FromIterator;
+ ///
+ /// let colors_vec = vec!["red", "red", "yellow", "blue"];
+ /// let colors_set = HashSet::<&str>::from_iter(colors_vec);
+ /// assert_eq!(colors_set.len(), 3);
+ /// ```
+ ///
+ /// `FromIterator` is more commonly used implicitly via the `Iterator::collect` method:
+ ///
+ /// ```
+ /// use std::collections::HashSet;
+ ///
+ /// let colors_vec = vec!["red", "red", "yellow", "blue"];
+ /// let colors_set = colors_vec.into_iter().collect::<HashSet<&str>>();
+ /// assert_eq!(colors_set.len(), 3);
+ /// ```
#[stable(feature = "rust1", since = "1.0.0")]
fn from_iter<T: IntoIterator<Item=A>>(iterator: T) -> Self;
}