0.pre7.86.flaky7.5:

0.pre7.86.flaky7.5:
	(gets through the typep.lisp problem of flaky7.4, now dies
		in xc of srctran, apparently because the LABELS code
		is still broken)
	s/find-lambda-vars/make-lambda-vars/
	s/compute-closure/add-lambda-vars-and-let-vars-to-closures/
	The old logic in CLOSE-OVER implicitly relied on LEAF-REFS
		being completely set up before any CLOSE-OVERs were
		called, else CLOSE-OVER could terminate prematurely
		in the (MEMBER THING (PHYSENV-CLOSURE)) clause.
		It looks as though it might even be the cause of the
		failure in xc of typep.lisp. Since I'm finding it
		difficult to grok, must less debug the order in which
		the compiler initializes and mutates things, any order
		dependency is the enemy, so rewrite it so that
		it floods more systematically.