I ran into this problem trying to make some more complex string
concatenation things, so just as a heads-up:
I haven't worked out the details, but I think in some situations (or
possibly all the time?) this can only go one layer deep. So:
\define foo()
{{$(bar)$!!baz}}
\end
\define foo2()
$(bar2)$.com
\end
<$set name=bar value={{!!something}}>
<$set name=bar2 value=<<foo>>>
<<foo2>>
</$set>
</$set>
returns the string (not the transclusion) {{$(bar)$!!baz}}.com where
$(bar)$ is substituted as expected.
There may be something else going on, like I said I haven't worked out all
the details.
Fortunately there is an easy way around this by using the set widget and
filters, so
\define foo2()
$(bar2)$.com
\end
<$set name=bar value={{!!something}}>
<$set name=bar2 filter='[<bar>get[baz]]'>
<<foo2>>
</$set>
</$set>
does work.
Once again, I don't know what part of the tiddlywiki parsing lets this work
and the other way not, and I may be missing some details. I will try to
work it out sometime soon.
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