45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
// Type for a syntax tree node that is reserved for future use.
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//
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// For example ExprReference contains a field `raw` of type Reserved. If `&raw
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// place` syntax becomes a thing as per https://github.com/rust-lang/rfcs/pull/2582,
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// we can backward compatibly change `raw`'s type to Option<Token![raw]> without
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// the possibility of breaking any code.
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use proc_macro2::Span;
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use std::marker::PhantomData;
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#[cfg(feature = "extra-traits")]
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use std::fmt::{self, Debug};
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ast_struct! {
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pub struct Reserved {
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_private: PhantomData<Span>,
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}
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}
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impl Default for Reserved {
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fn default() -> Self {
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Reserved {
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_private: PhantomData,
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}
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}
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}
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#[cfg(feature = "clone-impls")]
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#[cfg_attr(doc_cfg, doc(cfg(feature = "clone-impls")))]
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impl Clone for Reserved {
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fn clone(&self) -> Self {
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Reserved {
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_private: self._private,
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}
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}
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}
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#[cfg(feature = "extra-traits")]
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#[cfg_attr(doc_cfg, doc(cfg(feature = "extra-traits")))]
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impl Debug for Reserved {
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fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
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formatter.debug_struct("Reserved").finish()
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}
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}
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