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[`unused_enumerate_index`]: trigger on method calls The lint used to check for patterns looking like: ```rs for (_, x) in some_iter.enumerate() { // Index is ignored } ``` This commit further checks for chained method calls constructs where we can detect that the index is unused. Currently, this checks only for the following patterns: ```rs some_iter.enumerate().map_function(|(_, x)| ..) let x = some_iter.enumerate(); x.map_function(|(_, x)| ..) ``` where `map_function` is one of `all`, `any`, `filter_map`, `find_map`, `flat_map`, `for_each` or `map`. Fixes #12411. *Please write a short comment explaining your change (or "none" for internal only changes)* changelog: [`unused_enumerate_index`]: add detection for method chains such as `iter.enumerate().map(|(_, x)| x)` |
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