`neoformat` failed to pass the filename. https://github.com/sbdchd/neoformat/blob/afbc055587e88554b1fd11408cfab859d0cd40d3/autoload/neoformat/formatters/c.vim#L16 `-assume-filename=' . expand('"%"')` should be `-assume-filename="' . expand('%') . '"'`
neoformatfailed to pass the filename.neoformat/autoload/neoformat/formatters/c.vim
Line 16 in afbc055
-assume-filename=' . expand('"%"')should be-assume-filename="' . expand('%') . '"'