On Tue, 14 Jun 2011, Hans Hagen wrote:

> On 14-6-2011 12:51, Paul Menzel wrote:
>> Dear ConTeXt folks,
>> 
>> 
>> probably this is again a font problem, but I just want to report that
>> the definition symbol ≔ (colon equal) [1] I am able to insert directly
>> using Neo layout [2] is not displayed.
>
> The virtual lm does not has that symbol so I've added it.

In LM, \colonequals is created by a TeX macro. There were a few other 
symbols that were in the same category (\mapsto, long arrows). Earlier we 
did not have a clean mechanism to add these fallbacks. Is there such a 
mechanism now?

Aditya