I've found that some warnings can be affected by the presence of a syntax error.
Remove the error and, hey presto, the warning disappears or changes.
So as to not waste time dealing with fake warnings, I want to deal with the errors first, meaning that they would need to appear first in vim's location list.
Syntastic can sort, but :help syntastic-config-sort says it's by line number, then by type, then by column number. The only other option is to display in the order displayed by the generating compiler/checker... which is not configurable.
I know that I could do something like:
let g:syntastic_ruby_checkers=['errors-only', 'warnings-and-errors']
but that would further slow down the already slow-ish checking process in the general case where there are warnings but no errors.
Any way to get errors before warnings?
Or a work-around?
For instance, is there any way to run errors-only if an error is detected in the warnings-and-errors checker?
Or is there a way to: let g:syntastic_quiet_messages = { "level" : "warnings" } only if the list is empty for "level" : "errors"?
My work-around for fixing errors before warnings is to populate the location list with the errors first, followed by the warnings:
let g:syntastic_ruby_checkers=['mri', 'rubocop']
If I save after fixing errors, then any fake warnings disappear.