Inner function types in function type specs break highlighting of outer constructs

[dead-claudia]

Screenshot:

This similarly breaks when you just do fun(), though function() works as a workaround for that specific case.

fun() and fun(() -> some_type()) are valid types: https://erlang.org/doc/reference_manual/typespec.html#types-and-their-syntax

[dead-claudia]

I would fix it myself, but 1. I'm not remotely confident enough in my Erlang knowledge and 2. it looks to be potentially difficult to fix based on a cursory look at the grammar.