`Export` everywhere does not permit consistent shadowing
When using Export
, even if imports are ordered consistently, there is sometimes no way to obtain consistent shadowing:
From stdpp Require base.
Module or.
Export stdpp.base.
Definition or_comm := 10.
End or.
Module and.
Export stdpp.base.
Definition and_comm := 11.
End and.
Module A.
Import or and.
Locate or_comm.
(*
Constant stdpp.base.or_comm
Constant Coq.Init.Logic.or_comm (shorter name to refer to it in current context is Logic.or_comm)
Constant Top.or.or_comm (shorter name to refer to it in current context is or.or_comm)
*)
Locate and_comm.
(*
Constant Top.and.and_comm
Constant Coq.Init.Logic.and_comm (shorter name to refer to it in current context is Logic.and_comm)
Constant stdpp.base.and_comm (shorter name to refer to it in current context is base.and_comm)
*)
End A.
Here, importing and
overwrites or_comm
because of the stdpp.base
export.
I think the only way to avoid this is to avoid Export
ing except when the re-exported symbols are conceptually really part of that library (such as stdpp.prelude
).