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-----------------------------------
All romega tests in the test-suite are now bug-free. The only known
remaining limitation of romega with respect to omega is that it cannot
handle stuff on nat.
* Equivalences A<->B are now understood by romega (as well as omega),
and seen as (A->B)/\(B->A). There might be a smarter way to procede,
for instance having a primitive Iff construct and trying to break
equivalences as late as possible.
* Conclusion-as-Pprop issue:
After the resolution by the abstract omega machinery, useless parts
are discarded from the reification process by replacing them with
Pprop construct (see really_useful_prop). This allow to decrease
the size of the proof terms and speed up their normalisation, I guess.
But when such Pprop are created in the conclusion, this leads to
failure, since concl is negated, and this is donc only if it is
decidable. And introducing some Pprop might change the decidability
status of the concl: for instance, Pfalse is decidable, whereas
Pprop False is considered as _not_ decidable. Quick fix: no more
really_useful_prop applied on concl (needs careful computation of
useful_var).
* NEGATE_CONTRADICT(_INV):
This trace instrution comes in fact in two flavors, according to a
boolean flag. We now translate to O_NEGATE_CONTRADICT_INV if this
flag is false. (fix Besson's bug #1298)
* EXACT_DIVIDE:
could be used on NeqTerm and not only on EqTerm.
* h_step indexes:
The abstract omega machinery can introduce new hyps. In the list of hyps,
they appears _before_ the regular one (but after the goal seen as an hyp
by negating it). But the normalization steps were applied to regular hyps
thanks to their indexes counted _before_ the addition extra hyps.
* extra hyps (a)normal forms:
extra hyps and variables are initially of the shape
poly(v1,...,v(n-1)) = vn
but O_STATE was expecting them in form 0 = poly(...) + -vn
(by the way, SPLIT_INEQ should be checked someday).
Since the above is one weekend's worth of debugging, there might well
remain some more bugs :-(.
For the record, here's the less painful way to debug a failed romega run:
- activate debug flag in omega.ml and refl_omega.ml
- at the bottom of refl_omega, replace normalise_vm_in_concl with
convert_no_check (see comment there): this allow to skip the usually
_huge_ error message about "Impossible to unify True with ..."
- run the romega
- try to run Qed, and enjoy the nice errror message about a
(omega_tactic ? ? ? ?) that should be reducible to True.
Here starts the real debug work...
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@9962 85f007b7-540e-0410-9357-904b9bb8a0f7
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Théo Zimmermann
glondu
letouzey