Problem: users want to define their own checking function and not use
the syntastic defaults
Solution: dont load the syntastic default if a checking function
already exists. This way users can just define their own function and
override syntastic.
e.g. the user wants to have their own ruby checker, so in their vimrc
they just add:
function! SyntaxCheckers_ruby_GetLocList()
return SyntasticMake({"some custom stuff"})
endfunction
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