I currently have
autocmd BufRead *.sage \ set filetype=python | \ let b:syntastic_skip_checks=1
which works as intended (sage files are treated as Python, but with Syntastic disabled), and I would like to add
autocmd BufRead,BufNewFile) to it, but when I do, vim complains due to the
b:syntastic_skip_checks buffer-local variable not yet existing at the time the BufNewFile event is triggered. Is there a way to either force Syntastic to load in that buffer before the autocmd executes, or to defer setting that variable until after the buffer is fully initialised?