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Clicking into a python file after opening it in the editor. Find the stacktrace attached.
Created attachment 72154 [details] Stcktrace for NPE
I added a stresstest (which cycles through all the Python files in the Jython distribution and computes occurrences for every single offset in each file) and it quickly found the problem - there are some AST patterns where it fails to compute the call name, and the code wasn't expecting that. In addition to preventing that NPE, I'm fixing the problem with computing the call name (there were nested Call nodes which it didn't expect).
Fixed by changeset b2572fc20367 (will be in build #74 on hudson-python)
verified in recent builds