Re: \overrightarrow not working in mathmode in Metapost?

[Aditya Mahajan <adityam@umich.edu>]

On Fri, 18 Sep 2009, Matthijs Kooijman wrote:

> Hi,
>
> I've been trying to use the \overrightarrow command within a metapost graphic,
> but it doesn't work. Math mode does work, for example \vec works like
> expected. Outside of metapost, \overrightarrow works as expected.
>
> To illustrate the problem, I've created the following simple testcase:
>
>  \starttext
>  \startMPcode
>  draw btex $\vec{foo}$ etex;
>  draw btex $\overrightarrow{foo}$ etex;
>  \stopMPcode
>  \stoptext
>
> This gives the following error output:
>
> It seems the \overrightarrow command uses \@@smash, which isn't defined when
> running from metapost?
>
> Is this expected? Is this a bug?

This is a bug in math-arr. All arrow macros should be unexpanded (but I 
could not figure out how). Here is a workaround

\let\normaloverrightarrow\overrightarrow
\unexpanded\def\overrightarrow{\normaloverrightarrow}

Aditya

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