expansion: Give names to some fields of SyntaxExtension

src/librustc_metadata/creader.rs

@@ -569,9 +569,11 @@ impl<'a> CrateLoader<'a> {
             fn register_bang_proc_macro(&mut self,
                                         name: &str,
                                         expand: fn(TokenStream) -> TokenStream) {
-                let expand = SyntaxExtension::ProcMacro(
-                    Box::new(BangProcMacro { inner: expand }), false, self.edition
-                );
+                let expand = SyntaxExtension::ProcMacro {
+                    expander: Box::new(BangProcMacro { inner: expand }),
+                    allow_internal_unstable: false,
+                    edition: self.edition,
+                };
                 self.extensions.push((Symbol::intern(name), Lrc::new(expand)));
             }
         }

src/librustc_metadata/cstore_impl.rs

@@ -518,8 +518,11 @@ impl CrateStore for cstore::CStore {
             return LoadedMacro::ProcMacro(proc_macros[id.index.to_proc_macro_index()].1.clone());
         } else if data.name == "proc_macro" &&
                   self.get_crate_data(id.krate).item_name(id.index) == "quote" {
-            let ext = SyntaxExtension::ProcMacro(Box::new(::proc_macro::__internal::Quoter),
-                                                 true, data.root.edition);
+            let ext = SyntaxExtension::ProcMacro {
+                expander: Box::new(::proc_macro::__internal::Quoter),
+                allow_internal_unstable: true,
+                edition: data.root.edition,
+            };
             return LoadedMacro::ProcMacro(Lrc::new(ext));
         }
 

src/librustc_resolve/macros.rs

@@ -350,8 +350,8 @@ impl<'a> base::Resolver for Resolver<'a> {
     fn check_unused_macros(&self) {
         for did in self.unused_macros.iter() {
             let id_span = match *self.macro_map[did] {
-                SyntaxExtension::NormalTT { def_info, .. } => def_info,
-                SyntaxExtension::DeclMacro(.., osp, _) => osp,
+                SyntaxExtension::NormalTT { def_info, .. } |
+                SyntaxExtension::DeclMacro { def_info, .. } => def_info,
                 _ => None,
             };
             if let Some((id, span)) = id_span {
@@ -848,8 +848,6 @@ impl<'a> Resolver<'a> {
     /// Error if `ext` is a Macros 1.1 procedural macro being imported by `#[macro_use]`
     fn err_if_macro_use_proc_macro(&mut self, name: Name, use_span: Span,
                                    binding: &NameBinding<'a>) {
-        use self::SyntaxExtension::*;
-
         let krate = binding.def().def_id().krate;
 
         // Plugin-based syntax extensions are exempt from this check
@@ -859,15 +857,16 @@ impl<'a> Resolver<'a> {
 
         match *ext {
             // If `ext` is a procedural macro, check if we've already warned about it
-            AttrProcMacro(..) | ProcMacro(..) =>
+            SyntaxExtension::AttrProcMacro(..) | SyntaxExtension::ProcMacro { .. } =>
                 if !self.warned_proc_macros.insert(name) { return; },
             _ => return,
         }
 
         let warn_msg = match *ext {
-            AttrProcMacro(..) => "attribute procedural macros cannot be \
-                                  imported with `#[macro_use]`",
-            ProcMacro(..) => "procedural macros cannot be imported with `#[macro_use]`",
+            SyntaxExtension::AttrProcMacro(..) =>
+                "attribute procedural macros cannot be imported with `#[macro_use]`",
+            SyntaxExtension::ProcMacro { .. } =>
+                "procedural macros cannot be imported with `#[macro_use]`",
             _ => return,
         };
 

src/librustdoc/clean/mod.rs

@@ -1219,7 +1219,7 @@ fn macro_resolve(cx: &DocContext, path_str: &str) -> Option<Def> {
     let res = resolver
         .resolve_macro_to_def_inner(mark, &path, MacroKind::Bang, false);
     if let Ok(def) = res {
-        if let SyntaxExtension::DeclMacro(..) = *resolver.get_macro(def) {
+        if let SyntaxExtension::DeclMacro { .. } = *resolver.get_macro(def) {
             Some(def)
         } else {
             None

src/libsyntax/ext/base.rs

@@ -597,11 +597,11 @@ pub enum SyntaxExtension {
     MultiModifier(Box<MultiItemModifier + sync::Sync + sync::Send>),
 
     /// A function-like procedural macro. TokenStream -> TokenStream.
-    ProcMacro(
-        /* expander: */ Box<ProcMacro + sync::Sync + sync::Send>,
-        /* allow_internal_unstable: */ bool,
-        /* edition: */ Edition,
-    ),
+    ProcMacro {
+        expander: Box<ProcMacro + sync::Sync + sync::Send>,
+        allow_internal_unstable: bool,
+        edition: Edition,
+    },
 
     /// An attribute-like procedural macro. TokenStream, TokenStream -> TokenStream.
     /// The first TokenSteam is the attribute, the second is the annotated item.
@@ -646,19 +646,21 @@ pub enum SyntaxExtension {
     BuiltinDerive(BuiltinDeriveFn),
 
     /// A declarative macro, e.g. `macro m() {}`.
-    ///
-    /// The second element is the definition site span.
-    DeclMacro(Box<TTMacroExpander + sync::Sync + sync::Send>, Option<(ast::NodeId, Span)>, Edition),
+    DeclMacro {
+        expander: Box<TTMacroExpander + sync::Sync + sync::Send>,
+        def_info: Option<(ast::NodeId, Span)>,
+        edition: Edition,
+    }
 }
 
 impl SyntaxExtension {
     /// Return which kind of macro calls this syntax extension.
     pub fn kind(&self) -> MacroKind {
         match *self {
-            SyntaxExtension::DeclMacro(..) |
+            SyntaxExtension::DeclMacro { .. } |
             SyntaxExtension::NormalTT { .. } |
             SyntaxExtension::IdentTT(..) |
-            SyntaxExtension::ProcMacro(..) =>
+            SyntaxExtension::ProcMacro { .. } =>
                 MacroKind::Bang,
             SyntaxExtension::MultiDecorator(..) |
             SyntaxExtension::MultiModifier(..) |
@@ -672,8 +674,8 @@ impl SyntaxExtension {
 
     pub fn is_modern(&self) -> bool {
         match *self {
-            SyntaxExtension::DeclMacro(..) |
-            SyntaxExtension::ProcMacro(..) |
+            SyntaxExtension::DeclMacro { .. } |
+            SyntaxExtension::ProcMacro { .. } |
             SyntaxExtension::AttrProcMacro(..) |
             SyntaxExtension::ProcMacroDerive(..) => true,
             _ => false,
@@ -683,8 +685,8 @@ impl SyntaxExtension {
     pub fn edition(&self) -> Edition {
         match *self {
             SyntaxExtension::NormalTT { edition, .. } |
-            SyntaxExtension::DeclMacro(.., edition) |
-            SyntaxExtension::ProcMacro(.., edition) |
+            SyntaxExtension::DeclMacro { edition, .. } |
+            SyntaxExtension::ProcMacro { edition, .. } |
             SyntaxExtension::AttrProcMacro(.., edition) |
             SyntaxExtension::ProcMacroDerive(.., edition) => edition,
             // Unstable legacy stuff

src/libsyntax/ext/expand.rs

@@ -738,13 +738,13 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
         };
 
         let opt_expanded = match *ext {
-            DeclMacro(ref expand, def_span, edition) => {
-                if let Err(dummy_span) = validate_and_set_expn_info(self, def_span.map(|(_, s)| s),
+            DeclMacro { ref expander, def_info, edition } => {
+                if let Err(dummy_span) = validate_and_set_expn_info(self, def_info.map(|(_, s)| s),
                                                                     false, false, false, None,
                                                                     edition) {
                     dummy_span
                 } else {
-                    kind.make_from(expand.expand(self.cx, span, mac.node.stream()))
+                    kind.make_from(expander.expand(self.cx, span, mac.node.stream()))
                 }
             }
 
@@ -804,7 +804,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                 kind.dummy(span)
             }
 
-            ProcMacro(ref expandfun, allow_internal_unstable, edition) => {
+            SyntaxExtension::ProcMacro { ref expander, allow_internal_unstable, edition } => {
                 if ident.name != keywords::Invalid.name() {
                     let msg =
                         format!("macro {}! expects no ident argument, given '{}'", path, ident);
@@ -826,7 +826,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                         edition,
                     });
 
-                    let tok_result = expandfun.expand(self.cx, span, mac.node.stream());
+                    let tok_result = expander.expand(self.cx, span, mac.node.stream());
                     let result = self.parse_ast_fragment(tok_result, kind, path, span);
                     self.gate_proc_macro_expansion(span, &result);
                     result

src/libsyntax/ext/tt/macro_rules.rs

@@ -312,7 +312,11 @@ pub fn compile(sess: &ParseSess, features: &Features, def: &ast::Item, edition:
             edition,
         }
     } else {
-        SyntaxExtension::DeclMacro(expander, Some((def.id, def.span)), edition)
+        SyntaxExtension::DeclMacro {
+            expander,
+            def_info: Some((def.id, def.span)),
+            edition,
+        }
     }
 }