The release notes for Standard Library 6/11 at Inform Release Notes mention a new routine:
PrintOrRunVal(value, flag)
if value refers to to an object, prints that object’s name; if value refers to a routine, runs that routine; if value refers to a string, prints that string (with a terminating newline unless flag is true).
… but this routine doesn’t seem to exist in any Standard Library file, as far as I can tell, not even in 6.12.4. Was it dropped?