> Am 22.07.2017 um 22:34 schrieb Alan Braslau <braslau.list@comcast.net>:
> 
> On Fri, 21 Jul 2017 12:31:33 +0200
> Mathias Schickel <msch@fa.uni-tuebingen.de> wrote:
> 
>>> $\xrightarrow{}{}$
>> 
>> This throws errors. Any idea why?
>> 
>>> $\xrightoverleftarrow{}{33°C}$
>> 
>> This does work. Sadly it is not the arrow I want to have.
> 
> MWE:
> 
> \starttext
> $A \xrightarrow{}{} B$
> \stoptext
> 
> No problem here.

It seems to be a problem with the font I use.  Hans, do you have any idea why that does not work if I am using Minion Math? I am getting the following error:

attempt to get length of local 'charlist' (a nil value)
stack traceback:
	...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:514: in function 'horizontalcode'
	...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:541: in function <...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:540>
	(...tail calls...)

Mathias

> 
> Alan