bjoernager/rust
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Add comments to Spacing.

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This commit is contained in:
Nicholas Nethercote 2022-09-28 11:20:42 +10:00
parent 3be86e6528
commit bbb53bf772
1 changed files with 11 additions and 0 deletions
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11
compiler/rustc_ast/src/tokenstream.rs
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@ -304,9 +304,20 @@ pub struct AttributesData {
#[derive(Clone, Debug, Default, Encodable, Decodable)]
pub struct TokenStream(pub(crate) Lrc<Vec<TokenTree>>);
/// Similar to `proc_macro::Spacing`, but for tokens.
///
/// Note that all `ast::TokenTree::Token` instances have a `Spacing`, but when
/// we convert to `proc_macro::TokenTree` for proc macros only `Punct`
/// `TokenTree`s have a `proc_macro::Spacing`.
#[derive(Clone, Copy, Debug, PartialEq, Encodable, Decodable, HashStable_Generic)]
pub enum Spacing {
/// The token is not immediately followed by an operator token (as
/// determined by `Token::is_op`). E.g. a `+` token is `Alone` in `+ =`,
/// `+/*foo*/=`, `+ident`, and `+()`.
Alone,
/// The token is immediately followed by an operator token. E.g. a `+`
/// token is `Joint` in `+=` and `++`.
Joint,
}