that it drops from the expansion (like define/public) by
adding them to the origin syntax property (and sometimes
to disappeared-use; see the add-decl-props function
for details on those that aren't in the origin property)
this means that check syntax will now pick them up
so they'll show up in the blue boxes in drracket
Thanks Matthew, for some helpful advice and
comments on an initial version of the commit.
specifically, it doesn't trigger redrawing of the screen
as aggressively, which seems to make a little difference
under mac os x.
I'd have liked to be more sophisticated in the way redraws
are triggered, but I don't see how (see long comment in this
commit for details)
Generalize splitting of `(let-values ([(x ...) (values e ...)]) ....)'
to `(let ([x e] ...) ....)' for any `e', since it's always equivalent.
Right?
(The old requirements on the `e's seem to be needed only for
`letrec-values' splitting and maybe mutable variables.)
Treat unsafe functional operations (which never raise an
exception) as omitable, which means that simple `let-values'
combinations can be split into `let' bindings, etc.
Basically, Racklog (and all versions of schelog) implement ! by
causing the failure continuation of the entire relation being
returned. They did not also cause the unification caused by the
relation to be un-done.
However, it is not easy to separate un-doing the local changes because
the unification just returns a failure continuation too. I had to call
that fail continuation but use state to communicate to its target that
the next clause should not be visited.
I don't know if this is correct. My test suite contains a lot of cut
tests that still pass. Erik's test passes too. But I'm not confident
that this really works.
a substruct of a struct that got a contract via
provide/contract, and the subconstructor gets a value
that wouldn't have satisfied the original struct's contract
related to PR 12966
to syntax-original? identifiers
It used to pay attention to non-original identifiers if they
were in the disappeared-use or disappeared-binding
properties, but now that the 'syntax' macro is fixed
(commit f28e8a0) it can ignore all non-original identifiers
