Hello Wolfgang, after a few attempts that didn't work I copy-pasted the example from the wiki:

\definetyping[C][option=commands]
\startC
#include <stdio.h>
int main(){
	return 0;
	/BTEX{\em unreachedCode;}/ETEX
}
\stopC

This did not work.
However following the example you provided this works perfectly! Many thanks.

On Sun, Mar 15, 2020 at 6:26 AM <ntg-context-request@ntg.nl> wrote:
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Today's Topics:

   1. Source Code with Bolded Keywords (Yves Cloutier)
   2. Re: Source Code with Bolded Keywords (Wolfgang Schuster)
   3. Quizz (Fabrice Couvreur)
   4. Re: Quizz (Henning Hraban Ramm)
   5. METAPOST vardef returning multiple and non-numeric types as a
      single answer? (Gerben Wierda)


----------------------------------------------------------------------

Message: 1
Date: Sat, 14 Mar 2020 11:54:31 -0400
From: Yves Cloutier <yves.cloutier@gmail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: [NTG-context] Source Code with Bolded Keywords
Message-ID:
        <CAGW=J5f28-8QV3yKrP+ev+UkRf0Q+SP3MAbskaPxbkvn956GZw@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hello,

I am trying to typeset source code for a custom programming language and
would like to have the keywords in bold text.

I tried following the example found here regarding verbatim displays:

https://www.contextgarden.net/Verbatim_text#Displayed_text

Specifically the C example, however this does not seem to work. No
formatting is applied to my keywords.

Just wondering if the way to do it has changed or if there are other
examples I could look at to compare with what I'm doing.

Regards,

yc
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Message: 2
Date: Sat, 14 Mar 2020 20:03:34 +0100
From: Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>, Yves Cloutier
        <yves.cloutier@gmail.com>
Subject: Re: [NTG-context] Source Code with Bolded Keywords
Message-ID: <c1c6f324-476c-49e5-da9b-2b2dcecdde3f@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Yves Cloutier schrieb am 14.03.2020 um 16:54:
> Hello,
>
> I am trying to typeset source code for a custom programming language and
> would like to have the keywords in bold text.
>
> I tried following the example found here regarding verbatim displays:
>
> https://www.contextgarden.net/Verbatim_text#Displayed_text
>
> Specifically the C example, however this does not seem to work. No
> formatting is applied to my keywords.

Can you provide a minimal example what you have tried.

> Just wondering if the way to do it has changed or if there are other
> examples I could look at to compare with what I'm doing.

\starttext

\starttyping[escape=yes]
This is /BTEX\bf formatted/ETEX text.
\stoptyping

\starttyping[escape={<<,>>}]
This is <<\bf formatted>> text.
\stoptyping

\starttyping[escape={<!--,-->}]
This is <!--\bf formatted--> text.
\stoptyping

\stoptext

Wolfgang


------------------------------

Message: 3
Date: Sun, 15 Mar 2020 10:34:43 +0100
From: Fabrice Couvreur <fabrice1.couvreur@gmail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: [NTG-context] Quizz
Message-ID:
        <CACyK-eqU1Yk+bdw2Z0J=sMFmjKe3Lc_-PTxwhW09g+uLTk1Z3A@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi,
With the Coronavirus pandemic, my school will close like all the others. We
chose to work with Microsoft Teams. I know how to file Math exercises
written with ConteXt and export to pdf format. Is it possible with ConteXt
to create interactive Quizz?
Thank you
Fabrice
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------------------------------

Message: 4
Date: Sun, 15 Mar 2020 10:46:17 +0100
From: Henning Hraban Ramm <texml@fiee.net>
To: ntg-context@ntg.nl
Subject: Re: [NTG-context] Quizz
Message-ID: <3afc49c6-f279-49a7-2ef4-f13dacf295cf@fiee.net>
Content-Type: text/plain; charset=utf-8; format=flowed

Am 15.03.20 um 10:34 schrieb Fabrice Couvreur:
> Hi,
> With the Coronavirus pandemic, my school will close like all the others.
> We chose to work with Microsoft Teams. I know how to file Math exercises
> written with ConteXt and export to pdf format. Is it possible with
> ConteXt to create interactive Quizz?

You can create forms that work in Adobe Reader, but Radiobuttons are
broken in ConTeXt, and if you want to add validation, then good luck
getting JavaScript functions to work.

See https://wiki.contextgarden.net/Widgets

It much easier to use web technology (HTML forms).

Best, Hraban


------------------------------

Message: 5
Date: Sun, 15 Mar 2020 11:22:25 +0100
From: Gerben Wierda <gerben.wierda@rna.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: [NTG-context] METAPOST vardef returning multiple and
        non-numeric types as a single answer?
Message-ID: <1AFD4799-65FF-4574-A9B5-40BA3C532955@rna.nl>
Content-Type: text/plain; charset="utf-8"

I would like a vardef macro to return the pair of a picture and a bounding box. I don't want to use the setbound operator, because as soon as I do that, I cannot access the components of the picture anymore with pathpart.

I found metapost vardef returning multiple values <https://tex.stackexchange.com/questions/448740/metapost-vardef-returning-multiple-values> on StackExchange but that is about returning multiple values of the same numeric type. Is it possible to have vardef return a set of (picture, path) or (picture, picture) in some way? If not, I need to make two vardef macros for each result type.

I tried many things, amongst which:

vardef Foo( expr w, h)
% define pic
pic
end group,begingroup
% define pic
pic
endif

picture foo[]; foo = Foo( 2, 4);

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------------------------------

End of ntg-context Digest, Vol 189, Issue 28
********************************************