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Today, TACTIC EXTEND generates ad-hoc ML code that registers the tactic
and its parsing rule. Instead, we make it generate a typed AST that is
passed to the parser and a generic tactic execution routine.
PMP has written a small parser that can generate the same typed ASTs
without relying on camlp5, which is overkill for such simple macros.
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This ensures that the API is self-contained and is, well, an API.
Before this patch, the contents of `API.mli` bore little relation with
what was used by the plugins [example: `Metasyntax` in tacentries.ml].
Many missing types had to be added.
A sanity check of the `API.mli` file can be done with:
`ocamlfind ocamlc -rectypes -package camlp5 -I lib API/API.mli`
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Now it is a private field, locations are optional.
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The syntax is: TACTIC EXTEND foo AT LEVEL i
This commit makes it possible to define tacticals like the ssreflect
arrow without having to resort to GEXTEND statements and intepretation
hacks.
Note that it simply makes accessible through the ML interface what Tactic
Notation already supports:
Tactic Notation (at level 1) tactic1(t) "=>" ipats(l) := ...
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This commit is essentially moving files around. In particular, the corresponding
plugin still relies on a mllib file rather than a mlpack one. Otherwise, this
causes link-time issues for third-party plugins depending on modules defined
in the Ltac plugin.
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Maxime Dénès
Théo Zimmermann
Pierre-Marie Pédrot
Emilio Jesus Gallego Arias
Matej Kosik
Hugo Herbelin