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also, remove the "material_type_arg" meta for (->), hardcoded now
in Eliminate_algebraic

instead, emit a warning and do not finish the update.
In this way, at least we can work on the bench suite.

The only recent change in master currently ignored in
this merge is renaming mach.Array.Array63.array to array63.
If we decide to give array types in mach.Array specific names,
we should do it for every size, and not only for 63 bits.

for div and mod since we need to check division by zero

Also, put the call-site locations at the instantiated
pre- and post- conditions.

We only destruct n-tuples, unit types, and singleton records
without invariants. We only inline projection-like functions
for these types.

this allows us to infer missing post-conditions and to convert
partial applications to mappings at the same time, and saves
effort for Vc.