Complex type specification breaks 'function callgraph' utility

[fowlay]

Certain type specifications cause the 'function callgraph' utility to malfunction. The attached foo.erl module is a simple example.
foo.erl.txt

When clicking CodeInspection->GenerateFunctionCallgraph there is a pop-up saying "Internal error occured. Please report it!".

Workaround: Remove the -type specification and modify the -spec line accordingly.

erarafo_20170401_225858.txt

[vladdu]

We use a rather old version of wrangler. Unfortunately there isn't anyone maintaining the eclipse integration and I'm not sure if it's enough to just replace the wrangler binaries. I will investigate.