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explicitly show how iterating over .. fails #35701

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merged 3 commits into from
Aug 20, 2016
Merged

explicitly show how iterating over .. fails #35701

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377ae44
explicitly show how iterating over `..` fails
matthew-piziak Aug 15, 2016
c186da7
RangeFull for-loop iteration fails because of IntoIterator
matthew-piziak Aug 16, 2016
469b7fd
split example into three sections with explanation
matthew-piziak Aug 18, 2016
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27 changes: 20 additions & 7 deletions src/libcore/ops.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1462,17 +1462,30 @@ pub trait IndexMut<Idx: ?Sized>: Index<Idx> {
///
/// # Examples
///
/// The `..` syntax is a `RangeFull`:
///
/// ```
/// assert_eq!((..), std::ops::RangeFull);
/// ```
/// fn main() {
/// assert_eq!((..), std::ops::RangeFull);
///
/// let arr = [0, 1, 2, 3];
/// assert_eq!(arr[ .. ], [0,1,2,3]); // RangeFull
/// assert_eq!(arr[ ..3], [0,1,2 ]);
/// assert_eq!(arr[1.. ], [ 1,2,3]);
/// assert_eq!(arr[1..3], [ 1,2 ]);
/// It does not have an `IntoIterator` implementation, so you can't use it in a
/// `for` loop directly. This won't compile:
///
/// ```ignore
/// for i in .. {
/// // ...
/// }
/// ```
///
/// Used as a slicing index, `RangeFull` produces the full array as a slice.
///
/// ```
/// let arr = [0, 1, 2, 3];
/// assert_eq!(arr[ .. ], [0,1,2,3]); // RangeFull
/// assert_eq!(arr[ ..3], [0,1,2 ]);
/// assert_eq!(arr[1.. ], [ 1,2,3]);
/// assert_eq!(arr[1..3], [ 1,2 ]);
/// ```
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
#[stable(feature = "rust1", since = "1.0.0")]
pub struct RangeFull;
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