Log.fatal is not considered terminal

[nicois]

When a nil test ends with a call to log.Fatal, the analyser does not realise that execution will end, and appears to consider it as the same as other log methods.

[ksurent]

Looks like a duplicate of #70.

[yuxincs]

We indeed have a lot of terminal functions (as well as other abnormal control flows) to handle. Closing this as a duplicate of #70 . Let's continue the discussion there!

Thanks @ksurent !