55efa96659
improve the suggestion of the lint `unit-arg` Fixes #5823 Fixes #6015 Changes ``` help: move the expression in front of the call... | 3 | g(); | help: ...and use a unit literal instead | 3 | o.map_or((), |i| f(i)) | ``` into ``` help: move the expression in front of the call and replace it with the unit literal `()` | 3 | g(); | o.map_or((), |i| f(i)) | ``` changelog: improve the suggestion of the lint `unit-arg`