Using \type-|- in a \starttabulate ... \stoptabulate environment I
get:

[..]
Runaway argument?
- \NC $\Pattern _{m1}\ldots \Pattern _{mn_m}$ \term {->} $\Expr _m$ \NC \ETC.
! Forbidden control sequence found while scanning use of \next.
<inserted text> 
                \par 
<to be read again> 
                   \endtemplate 
<template> ...atehss \egroup \egroup \endtemplate 
                                                  
\processtabulate ...cr \fulltabulatecontent \crcr 
                                                  }}\ifnum \nofautotabulate ...
l.366 \stoptabulate
                   
? 

whereas when I use it outside, it gives me just what was intended.

Any ideas and hints are welcome

Marko