.bazelrc diagnostic when I forget the command

[alexeagle]

I always start an empty .bazelrc with --test_output=errors

and it has no effect because lines that don't start with a command don't work.

Would be nice if you underline that with a diagnostic that I needed to write test --test_output=errors

[pcj]

Would probably wrap this into a feature to provide diagnostics for missing/unknown commands in addition to unknown/deprecated flags.