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Fix error in airline#add_statusline_funcref
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@@ -19,7 +19,7 @@ endfunction
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function! airline#add_statusline_funcref(function)
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if index(g:airline_statusline_funcrefs, a:function) >= 0
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call airline#util#warning('The airline statusline funcref %s has already been added.', string(a:function))
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call airline#util#warning(printf('The airline statusline funcref "%s" has already been added.', string(a:function)))
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return
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endif
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call add(g:airline_statusline_funcrefs, a:function)
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