Add feature gate.
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8 changed files with 110 additions and 4 deletions
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@ -148,6 +148,8 @@ declare_features! (
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/// below (it has to be checked before expansion possibly makes
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/// macros disappear).
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(active, allow_internal_unstable, "1.0.0", None, None),
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/// Allows using anonymous lifetimes in argument-position impl-trait.
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(active, anonymous_lifetime_in_impl_trait, "1.63.0", None, None),
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/// Allows identifying the `compiler_builtins` crate.
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(active, compiler_builtins, "1.13.0", None, None),
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/// Outputs useful `assert!` messages
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