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Clarify SyntaxExtensionKind::LegacyDerive. #104760

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Nov 25, 2022
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Clarify SyntaxExtensionKind::LegacyDerive. #104760

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7 changes: 6 additions & 1 deletion compiler/rustc_expand/src/base.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -676,8 +676,13 @@ pub enum SyntaxExtensionKind {

/// A token-based derive macro.
Derive(
/// An expander with signature TokenStream -> TokenStream (not yet).
/// An expander with signature TokenStream -> TokenStream.
/// The produced TokenSteam is appended to the input TokenSteam.
///
/// FIXME: The text above describes how this should work. Currently it
/// is handled identically to `LegacyDerive`. It should be migrated to
/// a token-based representation like `Bang` and `Attr`, instead of
/// using `MultiItemModifier`.
Box<dyn MultiItemModifier + sync::Sync + sync::Send>,
),

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