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This removes quite a few unsafe casts. Unluckily, I had to reintroduce
the old non-module based names for these data structures, because I could
not reproduce easily the same hierarchy in EConstr.
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Commit dc438047 was a bit overlooked as it introduced a wrong comparison function
on term patterns in dnets. Strangely enough, it seems not to have wreaked havoc
that much compared to the severity of the error.
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Meta variables in rewrite rules are named by integers that are allocated
sequentially at runtime (fresh_meta in tactics/term_dnet.ml). This causes
a problem when some rewrite rules (with meta variables) are generated by
coqc, saved in a .vo file, and then imported into another coqc/coqtop
process. The new process will allocate its own meta variable numbers
starting from 0, colliding with existing imported meta variable numbers.
One manifestation of this issue was various failures of [rewrite_strat];
see bug #3815 for examples.
This change fixes the problem, by replacing all meta variable numbers
in imported rewrite rules at import time. This seems to fix the various
failures reported in bug #3815.
Thanks to Jason Gross for tracking down the commit that introduced this
bug in the first place (71a9b7f2).
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so as to reproduce correctly the reduction behavior of existing
projections, i.e. delta + iota. Make [projection] an abstract datatype
in Names.ml, most of the patch is about using that abstraction.
Fix unification.ml which tried canonical projections too early in
presence of primitive projections.
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