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Add custom_attribute and rustc_attrs to reference.md
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@ -2399,6 +2399,10 @@ The currently implemented features of the reference compiler are:
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ways insufficient for concatenating identifiers, and may be
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removed entirely for something more wholesome.
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* `custom_attribute` - Allows the usage of attributes unknown to the compiler
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so that new attributes can be added in a bacwards compatible
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manner (RFC 572).
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* `intrinsics` - Allows use of the "rust-intrinsics" ABI. Compiler intrinsics
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are inherently unstable and no promise about them is made.
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@ -2459,6 +2463,9 @@ The currently implemented features of the reference compiler are:
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implemented very poorly and will likely change significantly
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with a proper implementation.
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* `rustc_attrs` - Gates internal `#[rustc_*]` attributes which may be
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for internal use only or have meaning added to them in the future.
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* `rustc_diagnostic_macros`- A mysterious feature, used in the implementation
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of rustc, not meant for mortals.
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