UnnecessaryLet false negatives

[BraisGabin]

Right now this a.let { print(it) } and this a.let { msg -> print(msg) } are allowed but they should be flagged as well because you can replace both with println(a).

IntelliJ mark them as unnecessary too.

[BraisGabin]

One more case: a.let { 1.plus(1) } is another false negative (I'm working on this)