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Diffstat (limited to 'src/tools/clippy/src/docs/iter_on_empty_collections.txt')
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diff --git a/src/tools/clippy/src/docs/iter_on_empty_collections.txt b/src/tools/clippy/src/docs/iter_on_empty_collections.txt new file mode 100644 index 000000000..87c4ec12a --- /dev/null +++ b/src/tools/clippy/src/docs/iter_on_empty_collections.txt @@ -0,0 +1,25 @@ +### What it does + +Checks for calls to `iter`, `iter_mut` or `into_iter` on empty collections + +### Why is this bad? + +It is simpler to use the empty function from the standard library: + +### Example + +``` +use std::{slice, option}; +let a: slice::Iter<i32> = [].iter(); +let f: option::IntoIter<i32> = None.into_iter(); +``` +Use instead: +``` +use std::iter; +let a: iter::Empty<i32> = iter::empty(); +let b: iter::Empty<i32> = iter::empty(); +``` + +### Known problems + +The type of the resulting iterator might become incompatible with its usage
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