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Instead of modifying exceptions to wear additional information, we instead use
a dedicated type now. All exception-using functions were modified to support
this new type, in particular Future's fix_exn-s and the tactic monad.
To solve the problem of enriching exceptions at raise time and recover this
data in the try-with handler, we use a global datastructure recording the
given piece of data imperatively that we retrieve in the try-with handler.
We ensure that such instrumented try-with destroy the data so that there
may not be confusion with another exception. To further harden the correction
of this structure, we also check for pointer equality with the last raised
exception.
The global data structure is not thread-safe for now, which is incorrect as
the STM uses threads and enriched exceptions. Yet, we splitted the patch in
two parts, so that we do not introduce dependencies to the Thread library
immediatly. This will allow to revert only the second patch if ever we
switch to OCaml-coded lightweight threads.
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With ocaml 4.01, the 'unused open' warning also checks the mli :-)
Beware: some open are reported as useless when compiling with camlp5,
but are necessary for compatibility with camlp4. These open are now
marked with a comment.
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* vars.mli was mentionning Term instead of Constr, leading to a dep cycle
* Having a file named toplevel/toplevel.ml isn't a good idea when we also
have a toplevel/toplevel.mllib that ought to produce a toplevel.cma.
We rename toplevel.ml into Coqloop.ml
* Extra cleanup of toplevel.mllib :
- Ppextra isn't anywhere around (?!)
- Ppvernac was mentionned twice, and rather belongs to printing.mllib anyway
- Vernacexpr is a .mli and shouldn't appear in an .mllib
* During the link, printing.cma now comes after parsing.cma (Ppvernac uses Egramml)
* A few extra -threads in ocamlbuild files (btw, it's a bit sad to need -thread
for coqchk).
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Maxime Dénès
Pierre-Marie Pédrot
Pierre Letouzey