On Wednesday, 31 August 2016 at 09:56:17 UTC, Johan Engelen wrote:
(I can only think of complicated stuff that requires pretty much whole-program analysis to prove validity, and in that case adding `private` doesn't help any more)


Yes, it does help. As private prevents usage outside of a module it allows to do some optimizations that required whole program analysis otherwise, e.g. variables and functions can get internal linkage, thus reducing loads/stores and indirect calls.

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