The docs of Camelcade talk about sub resolution, but I'm not sure how it's implemented.

Inspecting the Op-Tree could be a way, cause B::Deparse shows that it's a method call and B::Xref lists all subs.

Camelcade also warns that sub resolution is not 100% reliable.

Unless an implementation offers it via "Language Server Protocol" I doubt one can call it a common IDE feature.

And I'd really like to know how the existence of a sub AUTOLOAD is handled...