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The unstable_features lint detects uses of #![feature].





In larger nightly-based projects which

  • consist of a multitude of crates where a subset of crates has to compile on stable either unconditionally or depending on a cfg flag to for example allow stable users to depend on them,
  • don’t use nightly for experimental features but for, e.g., unstable options only,

this lint may come in handy to enforce policies of these kinds.