Add new lint for `Result<T, E>.map_or(None, Some(T))`#5415

Merged

bors merged 9 commits intorust-lang:masterfrom nickrtorres:master

Apr 8, 2020

+142-16

Commits on Apr 4, 2020

result_map_or_into_option: add lint to catch manually adpating Result -> Option
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result_map_or_into_option: explicitly note absence of known problems
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result_map_or_into_option: add good and bad examples
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result_map_or_into_option: destructure lint tuple or return early
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result_map_or_into_option: add opt.map_or(None, |_| Some(y)) test
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result_map_or_into_option: move arg checks into tuple assignment
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result_map_or_into_option: fix cargo dev fmt --check errors
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result_map_or_into: fix dogfood_clippy error => {h,l}int
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Commits on Apr 5, 2020

result_map_or_into_option: fix syntax error in example
nickrtorres
committed