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By default Coq stdlib warnings raise an error, so this is really required.
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The purpose of `NsatzTactic` is to allow using `nsatz` without the
dependency on real axioms. So we declare the instances for `Z` and `Q`
in that file, so that users don't have to re-create them.
Fixes #12860
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As per https://github.com/coq/coq/pull/12073#issuecomment-612869336
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Closes #5445
Note that we use `Include` rather than `Export` to expose the machinery
defined in `NsatzTactic` from `Nsatz` to preserve backwards
compatibility with developments relying on absolute names of the
constants previously defined in `Nsatz.v`.
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Add headers to a few files which were missing them.
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Currently, `.v` under the `Coq.` prefix are found in both `theories`
and `plugins`. Usually these two directories are merged by special
loadpath code that allows double-binding of the prefix.
This adds some complexity to the build and loadpath system; and in
particular, it prevents from handling the `Coq.*` prefix in the
simple, `-R theories Coq` standard way.
We thus move all `.v` files to theories, leaving `plugins` as an
OCaml-only directory, and modify accordingly the loadpath / build
infrastructure.
Note that in general `plugins/foo/Foo.v` was not self-contained, in
the sense that it depended on files in `theories` and files in
`theories` depended on it; moreover, Coq saw all these files as
belonging to the same namespace so it didn't really care where they
lived.
This could also imply a performance gain as we now effectively
traverse less directories when locating a library.
See also discussion in #10003
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