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Tracking issue for RFC amendment #1384 #30450

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@pnkfelix

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@pnkfelix

Need to implement RFC amendment rust-lang/rfcs#1384 to RFC 550 (macro input future proofing)

  • land amendment with warning for macro definitions that were previously accepted but will error in next cycle
  • after a cycle, promote the warning to an error.

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B-RFC-approvedBlocker: Approved by a merged RFC but not yet implemented.B-unstableBlocker: Implemented in the nightly compiler and unstable.C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFC

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