How does one concatenate a string and a calculated value (e.g a macro or a 
transclusion)?

For example this doesn't work:

<$set name="url" value="http://foo.com/#:";<<currentTiddler>>>

<$set name="url" value=http://foo.com/#:<<currentTiddler>>>

<$set name="url" value="http://foo.com/#:<<currentTiddler>>">


Doc on the setwidget <http://tiddlywiki.com/#SetWidget>doesn't make this 
clear. Nor does other places (ex 
<http://tobibeer.github.io/tb5/#Variables%20vs.%20Parameters>). The issue 
is of course not specific for the setwidget but it is a bit ironic 
specifically for the setwidget as this, from what I understand, is used for 
avoiding these difficulties.

<:-)

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