0.7.6.18:

0.7.6.18:
	SYMBOL-MACROLET fixes
	... throw a COMPILER-ERROR when attempting to bind a special or
		a constant with SYMBOL-MACROLET
	... throw a PROGRAM-ERROR when attempting to run a form
		compiled with errors
	(thanks to Raymond Toy and Eric Marsden for their work on the
		CMUCL side)