On 1 Mar 2019, at 01:24, Hans Hagen <j.hagen@xs4all.nl> wrote:

On 2/28/2019 11:29 AM, Procházka Lukáš Ing. wrote:

Hello,
I'm struggling with using modes to make a part of the text conditional.
Here is my code:
----
\def\b#1{\startmode[#1]}
\def\e{\stopmode}
% \enablemode[100] % For optional usage
\starttext
  A
  \b{100} % Should be start of some conditional text from here ...
    B
  \e % ... to here
\stoptext
----
Compilation fails with:
"
tex error       > tex error on line 0 in file : ! Emergency stop
<*> cont-yes.mkiv
<empty file>
*** (job aborted, no legal \end found)
"
How to make the sample work?

modes are like buffers ... don't wrap them in macros

(using names like \b \e is a bad idea anyway)

Hans


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