Should we reserve `dyn` as a keyword for the 2018 Edition?

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We discussed this in the lang team meeting today. We settled on the following:

  • when possible, prefer a “true keyword” in the new edition
    • notably, for new features
    • e.g., async, await, try, etc
  • for features that exist on old epoch, use contextual keyword in both
    • hence dyn, union

More detailed minutes available in this paper document

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