MerlinOccurrences errors in vim

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I'm getting the following error when using :MerlinOccurrences in vim (both in merlin master and the latest version from opam):

Error detected while processing function merlin#Occurrences:
line   12:
E924: Current window was closed

Finding occurrences actually works using <LocalLeader>*, but the list is not shown. The error doesn't appear when I use let g:merlin_display_occurrence_list = 0.

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The problem is actually caused by syntastic – as it turns out syntastic was installed system-wide and I forgot to remove it while testing.

It happens due to setting g:syntastic_auto_loc_list to 1, which causes the location list to be closed automatically when there are no errors (which happens too quick, apparently). Fixed by setting it to 3.