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Now it is a private field, locations are optional.
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Suggested by @ppedrot
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In some cases prior to this patch, there were two cases for the same
error function, one taking a location, the other not.
We unify them by using an option parameter, in the line with recent
changes in warnings and feedback.
This implies a bit of clean up in some places, but more importantly, is
the preparation for subsequent patches making `Loc.location` opaque,
change that could be use to improve modularity and allow a more
functional implementation strategy --- for example --- of the
beautifier.
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module)
For the moment, there is an Error module in compilers-lib/ocamlbytecomp.cm(x)a
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For better error messages. The API change is
backwards compatible, using a new optional argument.
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longer stable w.r.t. equality constraints as the universe graph will
choose different canonical levels depending on the equalities given to
it (l = r vs r = l).
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This allows to remove a lot of independent code from Evd which was put
into the UState module. The API is not perfect yet, but this is a first
pass. Names of data structures should be thought about too because they
are way too similar.
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