diff options
Diffstat (limited to 'src/libsyntax/ext/base.rs')
| -rw-r--r-- | src/libsyntax/ext/base.rs | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs index a540b23551b..a2a442f8b6a 100644 --- a/src/libsyntax/ext/base.rs +++ b/src/libsyntax/ext/base.rs @@ -264,8 +264,15 @@ pub enum SyntaxExtension { /// A function-like syntax extension that has an extra ident before /// the block. /// - /// `macro_rules!` is an `IdentTT`. IdentTT(Box<IdentMacroExpander + 'static>, Option<Span>), + + /// An ident macro that has two properties: + /// - it adds a macro definition to the environment, and + /// - the definition it adds doesn't introduce any new + /// identifiers. + /// + /// `macro_rules!` is a LetSyntaxTT + LetSyntaxTT(Box<IdentMacroExpander + 'static>, Option<Span>), } pub type NamedSyntaxExtension = (Name, SyntaxExtension); @@ -300,7 +307,7 @@ pub fn syntax_expander_table() -> SyntaxEnv { let mut syntax_expanders = SyntaxEnv::new(); syntax_expanders.insert(intern("macro_rules"), - IdentTT(box BasicIdentMacroExpander { + LetSyntaxTT(box BasicIdentMacroExpander { expander: ext::tt::macro_rules::add_new_extension, span: None, }, |