patcoll/aspen.vim — pull request #1 by whit537 (2012-05-16 18:14:11+00:00)
Title: Fix 'No such variable: "b:current_syntax"'

Without this check I get the following:

Error detected while processing /Users/whit537/.vim/syntax/aspen.vim:
line 2:
E108: No such variable: "b:current_syntax"
Press ENTER or type command to continue