whatis loop

[Donn Cave <donn@u.washington.edu>]

This caused "es" to go to infinite recursion:

	;; local (fn-a = ()) {
		fn-a = @{echo hey}
		fn-c = @{a}
	}
	;; whatis c

Stack trace at randomly selected starting point:

#771 0x119ce in strv (fmt=(char *) 0x11e4d "%C", args=(char *) 0x3ffc0f8c "p\252\002") (str.c line 30)
#772 0x11a13 in str (fmt=(char *) 0x11e4d "%C", 174704) (str.c line 42)
#773 0x11f0c in getstr (term=(struct Term *) 0x2aa7c) (term.c line 22)
#774 0xdab in Lconv (f=(struct Format *) 0x3ffc104c) (conv.c line 21)
#775 0x10685 in printfmt (format=(struct Format *) 0x3ffc104c, fmt=(char *) 0x14f7 "%S=(%#L) ") (print.c line 250)
#776 0x106e5 in fmtprint (format=(struct Format *) 0x3ffc104c, fmt=(char *) 0x14f7 "%S=(%#L) ", 173980, 174728, 5365) (print.c line 271)
#777 0x1591 in Cconv (f=(struct Format *) 0x3ffc104c) (conv.c line 188)
#778 0x10685 in printfmt (format=(struct Format *) 0x3ffc104c, fmt=(char *) 0x11e4d "%C") (print.c line 250)

	Donn Cave, University Computing Services, University of Washington
	donn@cac.washington.edu