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* Preserve the same behavior/interface but merge the two Module Types
(UNDER_EQ and) UNDER_REL.
* Remove the "Reflexive" argument in Under_rel.Under_rel
* Update plugin code (ssrfwd.ml) & Factor-out the main step
* Update the Hint (viz. apply over_rel_done => apply: over_rel_done)
* All the tests still pass!
Credits to @CohenCyril for suggesting this enhancement
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as suggested by @gares, and:
* Rename some Under_* terms for better uniformity;
* Update & Improve minor details in the documentation.
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It was only required in the (not realistic) test case "test_over_2_2",
which happened to introduce evars after the context variables.
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* Rely on a new tactic unify_helper that workarounds the fact
[apply Under.under_done] cannot unify (?G i...) with (expr i...) in
[|- @Under T (expr i...) (?G i...)]
when expr is a constant expression, or has more than one var (i...).
Idea: massage the expression with Ltac to obtain a beta redex.
* Simplify test-suite/ssr/under.v by using TestSuite.ssr_mini_mathcomp
and add a test-case [test_big_andb].
* Summary of commands to quickly test [under]:
$ cd .../coq
$ make plugins/ssr/ssreflect.vo plugins/ssr/ssrfun.vo plugins/ssr/ssrbool.vo
$ cd test-suite
$ touch prerequisite/ssr_mini_mathcomp.v
$ make
$ emacs under.v
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