I feel like (MethodContext removeSelector: #cachedStackTop)
Any objection ?

cachedStackTop
	"WARNING - this method depends on a very dirty trick, viz. snitching
information off the variable stack of a particular CompiledMethod.  So
if you add/remove a temp in BlockContext>>valueUninterruptably, this
method will fail, probably with some horrible consequences I'd rather
not think through just now ... assumption is that the variable
declaration in that method looks like:
		| sendingContext result homeSender |"

	^self tempAt: 3