Syntax
The CLEARRETURNS: command has no arguments. It is used to
re-initialise the macro-handling system. That is, any outstanding
return addresses from macro are removed, and the program is left awaiting
keyboard input. This facility is chiefly useful after an error has occurred.
Notice that the return address stack is automatically cleared
when a RESTART: command is issued, but not when a CLEAR:
command is issued.
