Trail registers

[Thomas Charles CONWAY]

Hi

Is there any reason that the trail pointer is not treated like a
normal virtual machine register?

I'm in the process of making a reentrant version of the engine,
and the trail pointer and ticket counters stand out as warts because
they are arranged differently to the other registers.

Thomas
-- 
ZZ:wq!
^X^C
Thomas Conway               				      conway at cs.mu.oz.au
AD DEUM ET VINUM	  			      Every sword has two edges.