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We implement a new type of "preterms" that represent untyped ASTs, corresponding
to glob_expr in the ML implementations. Ltac2 quotations inside notations are
provided with such preterms, and have to pretype them in order to do anything
of relevance with them.
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This is the dual of #10344.
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This looks more principled, and doesn't require as much tinkering with
the typing implementation.
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Since Ltac2 cannot be put under the stdlib logical root (some file names
would clash), we move it to the `user-contrib` directory, to avoid adding
another hardcoded path in `coqinit.ml`, following a suggestion by @ejgallego.
Thanks to @Zimmi48 for the thorough documentation review and the
numerous suggestions.
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