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Add headers to a few files which were missing them.
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If you have access to a kernel name you also should have the
environment in which it is defined, barring hacks. In order to
disfavor hacks we make the standard lookups raise anomalies so that
people are forced to admit they rely on the internals of the
environment.
We find that hackers operated on the code for side effects, for
finding inductive schemes, for simpl and for Print Assumptions. They
attempted to operate on funind but the error handling code they wrote
would have raised another Not_found instead of being useful.
All these uses are indeed hacky so I am satisfied that we are not
forcing new hacks on callers.
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This is a pre-requisite to use automated formatting tools such as
`ocamlformat`, also, there were quite a few places where the comments
had basically no effect, thus it was confusing for the developer.
p.s: Reading some comments was a lot of fun :)
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Up to this point the `lib` directory contained two different library
archives, `clib.cma` and `lib.cma`, which a rough splitting between
Coq-specific libraries and general-purpose ones.
We know split the directory in two, as to make the distinction clear:
- `clib`: contains libraries that are not Coq specific and implement
common data structures and programming patterns. These libraries
could be eventually replace with external dependencies and the rest
of the code base wouldn't notice much.
- `lib`: contains Coq-specific common libraries in widespread use
along the codebase, but that are not considered part of other
components. Examples are printing, error handling, or flags.
In some cases we have coupling due to utility files depending on Coq
specific flags, however this commit doesn't modify any files, but only
moves them around, further cleanup is welcome, as indeed a few files
in `lib` should likely be placed in `clib`.
Also note that `Deque` is not used ATM.
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