OK, it's not the macro.  This fails (same error: ! This can't happen 
(add_disc_widths)):

\starttext
St. \stretched[width=]{Banac}
\stoptext

This works:

\starttext
St. \stretched[width=]{Bana}
\stoptext

Strange.

On Apr 6, 2013, at 10:26 AM, "Rogers, Michael K" <mrog...@emory.edu>
 wrote:

> Hi,
> 
> Below \stretched works by itself, but causes a fatal error when in the macro 
> (\Name).  I get the same result with all variants.
> Perhaps there's a better way?
> 
> MWE:
> 
> %%%%%%%%
> \def\Name{\stretched[width=]}
> %\def\Name#1{\stretched[width=]{#1}}
> %\define[1]\Name{\stretched[width=]{#1}}
> 
> \starttext
> 
> \stretched[width=]{Hi there!}
> 
> St. \Name{Banach}
> 
> \stoptext
> %%%%%%%%
> 
> Here's part of the log:
> 
> ConTeXt  ver: 2013.04.05 22:00 MKIV beta  fmt: 2013.4.6  int: english/english
> …
> ! This can't happen (add_disc_widths).
> 
> system          > tex > error on line 10 in file foo18453.tex: This can't 
> happen ( ...
> 
> 1     \def\Name{\stretched[width=]}
> 2     \def\Name#1{\stretched[width=]{#1}}
> 3     %\define[1]\Name{\stretched[width=]{#1}}
> 4
> 5     \starttext
> 6
> 7     \stretched[width=]{Hi there!}
> 8
> 9     St. \Name{Banach}
> 10 >>
> 11     \stoptext
> 12
> 13
> 
> l.10
> 
> !  ==> Fatal error occurred, no output PDF file produced!
> mtx-context     | fatal error: return code: 1
> 
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