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