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Add a comment on TokenKind::Interpolated.

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This commit is contained in:
Nicholas Nethercote 2022-05-04 16:12:09 +10:00
parent 99f5945f85
commit baa18c027a
1 changed files with 9 additions and 0 deletions
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9
compiler/rustc_ast/src/token.rs
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@ -237,6 +237,15 @@ pub enum TokenKind {
/// treat regular and interpolated lifetime identifiers in the same way.
Lifetime(Symbol),
/// An embedded AST node, as produced by a macro. This only exists for
/// historical reasons. We'd like to get rid of it, for multiple reasons.
/// - It's conceptually very strange. Saying a token can contain an AST
/// node is like saying, in natural language, that a word can contain a
/// sentence.
/// - It requires special handling in a bunch of places in the parser.
/// - It prevents `Token` from implementing `Copy`.
/// It adds complexity and likely slows things down. Please don't add new
/// occurrences of this token kind!
Interpolated(Lrc<Nonterminal>),
/// A doc comment token.