> Any colon prefixed syntax can be made to work because it is enough for the
> lexer to detect and handle... so
>
> :{defined varname}
>
> may be an option, although I do not like the space much because it adds some
> fuzzyness in the lexer which has to process it. It is probably doable,
> though. I like having a "?" because there is a question. Other
> suggestions somehow in line with your proposal could be
> :{?varname}
> :{varname?}
> what do you think?
Here is a version with the :{?varname} syntax.
--
Fabien.
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