On Tue 17 Jan 2012 22:02, Mark H Weaver <m...@netris.org> writes: > Therefore, the R5RS leaves no possible way for a complaint `eval' to > restore the previous value of (current-module) after evaluation. > Indeed, this is prohibited at a semantic level.
FWIW, Racket circumvents this problem nicely, with what they call "continuation marks". We might be able to reuse their strategy in our with-fluids implementation. Andy -- http://wingolog.org/
