Handle branches in anonymous function pattern matching

[jrglee]

While adopting my previous contribution in #493, I was still finding case patterns not being counted as branches. This was only in anonymous functions, where the parameter is used as selector, e.g.:

(1 to 100).map {
  case i if i % 2 == 0 => true
  case _ => false
}

The match handling does not instrument the case statements when the selector gets generated. But anonymous functions are a special case because the case statements are written by the user.

The solution in this PR handles anonymous function case by checking if the function body itself is a match node in the AST.

[ckipp01]

Hey @jrglee! Thanks for the PR. This make sense, LGTM!

[davidhoyt]

Thank you!! Will there be a new release soon with this? I really appreciate contributors' and maintainers' hard work! 😄

[ckipp01]

Thank you!! Will there be a new release soon with this? I really appreciate contributors' and maintainers' hard work! 😄

Hey! Just cut a new release so you should be good to update!

[davidhoyt]

Thank you for getting a new release out so quickly!