[comp.lang.prolog] Shriek as an operator.

pop@cs.umass.edu (02/14/91)

What is interesting is that Poplog Prolog has exactly the same behaviour,
namely that a postfix '!' gives a syntax error if '!' can be an infix.
The parser, by Simon Nichols and Rob Duncan is implemented POP-11, so 
one might expect it to be independent, tho' I don't know whether they made
use of the code of C-prolog in writing it.