| 1 | // Type for a syntax tree node that is reserved for future use. |
| 2 | // |
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| 3 | // For example ExprReference contains a field `raw` of type Reserved. If `&raw |
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| 4 | // place` syntax becomes a thing as per https://github.com/rust-lang/rfcs/pull/2582, |
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| 5 | // we can backward compatibly change `raw`'s type to Option<Token![raw]> without |
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| 6 | // the possibility of breaking any code. |
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| 7 | |
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| 8 | use proc_macro2::Span; |
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| 9 | use std::marker::PhantomData; |
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| 10 | |
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| 11 | #[cfg (feature = "extra-traits" )] |
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| 12 | use std::fmt::{self, Debug}; |
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| 13 | |
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| 14 | ast_struct! { |
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| 15 | pub struct Reserved { |
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| 16 | _private: PhantomData<Span>, |
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| 17 | } |
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| 18 | } |
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| 19 | |
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| 20 | impl Default for Reserved { |
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| 21 | fn default() -> Self { |
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| 22 | Reserved { |
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| 23 | _private: PhantomData, |
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| 24 | } |
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| 25 | } |
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| 26 | } |
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| 27 | |
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| 28 | #[cfg (feature = "clone-impls" )] |
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| 29 | #[cfg_attr (doc_cfg, doc(cfg(feature = "clone-impls" )))] |
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| 30 | impl Clone for Reserved { |
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| 31 | fn clone(&self) -> Self { |
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| 32 | Reserved { |
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| 33 | _private: self._private, |
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| 34 | } |
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| 35 | } |
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| 36 | } |
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| 37 | |
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| 38 | #[cfg (feature = "extra-traits" )] |
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| 39 | #[cfg_attr (doc_cfg, doc(cfg(feature = "extra-traits" )))] |
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| 40 | impl Debug for Reserved { |
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| 41 | fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
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| 42 | formatter.debug_struct(name:"Reserved" ).finish() |
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| 43 | } |
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| 44 | } |
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| 45 | |
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