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["Alain Herreman" <address@hidden>]

Hi,

I'm coming back to my pb : to hide an environnement.
Let say I have defined the environnement "answer" which I want to hide when
I print an exam and which I want to make visible when I print the answers of
the exam.

I have defined a variable "answer-visible?" which has the value "true" or
"false" and in a ts file :

<assign|answer|<macro|body|<if|<answer-visible?>|<surround|<vspace*|1fn><for
mat no first indentation>|<htab|5mn>|<arg|body>>>>>

But, with answer-visible? true, surround doesn't work : I have one long line
without any return.

Do you have any explanation or solution?

Thank you.

Alain