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PL_warning prints a standard Prolog warning message to the standard
error (user_error) stream. Please note that new code should
consider using PL_raise_exception to raise a Prolog exception. See
also exception.
- intPL_warningformat, a1, ...
Print an error message starting with `[WARNING: ', followed
by the output from format, followed by a `]' and a newline.
Then start the tracer. format and the arguments are the same as
for printf2. Always returns FALSE.
Dr. Richard Botting
2001-12-12