>> If $0 is followed by '_' (e.g., $0_switch) then you must use ${0}. The
>> preprocessor is looking for '$' followed by Perl 'word' characters
>> (alphanumerics + '_').
>
>
> Here's a patch that avoids this issue.
That was indeed the case - perl seems to handle $X variables a bit differently
from bash, which was a bit unexpected for me. The patch you attached does
indeed fix this issue.
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