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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

Added debugging for driver's transformations

See merge request !38

This closes isse #179

This does not fix #183, just prevents the failure. TBC.

Resolve "Reloading should interrupt running provers"

Closes #174

See merge request !36

interrupt is now properly handled by why3server

Fix ce-bench for diffs between platforms

See merge request !34

This makes Timeout and Unknown equivalent and remove the diff on floats
that differs on moloch and CI.

subst can make constant definitions recursive, making them
fail termination check. Convert such definitions into axioms
on the fly. Tentative fix for #195.

use variant inference from Decl to prove termination
for pure recursive functions without variant.

For a measured time of 0.49 second, a prover would only get 1 second to
replay the proof, i.e., half of the expected 1.98 seconds. The time limit
is now rounded to nearest to prevent this underestimation on fast proofs.