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The snapshots using duplicate_ident_printer are there to avoid editing the
printer during display of error.
This also improves the error messages for transformation apply by adding
an error exception.

Also, fix a problem of search on constructor

top-level constants of the form [val c: tau]

This commit also raises an assertion failure on Ehole and Eany in the
OCaml printer. (This was already the case for the C printer.)

Status of the parent task was updated before the new subtasks had been
associated to it. As a consequence, it was believed to be valid since it
had no children yet.

The old CI slaves had a `bench-image-system` image, hence causing the
issue to go unnoticed. This means that they were using a possibly
obsolete image.

This commit brings the following changes:
- test the system compiler,
- test the opam-installed 4.02.3 compiler,
- use the system and 4.07.0 compilers for "bench",
- use the 4.07.0 compiler for "full",
- use the 4.05.0 compiler for the prover-based targets (because of Zenon).

 . Moved [ity_affected], [pv_affected], and [pvs_affected] from src/mlw/vc.ml to
   src/mlw/ity.ml. These are also declared in src/mlw/ity.mli;

 . the test for conflicting reads and writes effects now uses the [pvs_affected]
   function.

thanks to Sylvain for noticing.

Shape and checksum

See merge request !44

Even when checksums are equal, we check that the shape are oks. This
allows to keep examples with up to date shape.

eliminate_match may move forward tuple type declarations.
This patch makes is move the corresponding Use tdecls along,
to stay compatible with the logic of Task.local_decls, fixing #183.

"at/old operator unused" is now a warning not an error.

See merge request !42

The warning can be disabled by a debug flag.
The bench was changed so as to accept examples that **should** output
warning but not fail (this category did not exist, it does now) and
label_scope has been switched to it.

Ce bench update

See merge request !39