Don't try get local DefId of imported macro in rustdoc.

src/librustdoc/clean/mod.rs

@@ -2801,7 +2801,7 @@ impl Clean<Item> for doctree::Macro {
             visibility: Some(Public),
             stability: self.stab.clean(cx),
             deprecation: self.depr.clean(cx),
-            def_id: cx.tcx.map.local_def_id(self.id),
+            def_id: self.def_id,
             inner: MacroItem(Macro {
                 source: format!("macro_rules! {} {{\n{}}}",
                                 name,

src/librustdoc/doctree.rs

@@ -233,9 +233,11 @@ pub struct DefaultImpl {
     pub whence: Span,
 }
 
+// For Macro we store the DefId instead of the NodeId, since we also create
+// these imported macro_rules (which only have a DUMMY_NODE_ID).
 pub struct Macro {
     pub name: Name,
-    pub id: ast::NodeId,
+    pub def_id: hir::def_id::DefId,
     pub attrs: hir::HirVec<ast::Attribute>,
     pub whence: Span,
     pub matchers: hir::HirVec<Span>,

src/librustdoc/visit_ast.rs

@@ -85,7 +85,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                                               None);
         // attach the crate's exported macros to the top-level module:
         let macro_exports: Vec<_> =
-            krate.exported_macros.iter().map(|def| self.visit_macro(def)).collect();
+            krate.exported_macros.iter().map(|def| self.visit_local_macro(def)).collect();
         self.module.macros.extend(macro_exports);
         self.module.is_crate = true;
     }
@@ -210,7 +210,7 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
                     // FIXME(jseyfried) merge with `self.visit_macro()`
                     let matchers = def.body.chunks(4).map(|arm| arm[0].get_span()).collect();
                     om.macros.push(Macro {
-                        id: def.id,
+                        def_id: def_id,
                         attrs: def.attrs.clone().into(),
                         name: def.ident.name,
                         whence: def.span,
@@ -513,12 +513,12 @@ impl<'a, 'tcx> RustdocVisitor<'a, 'tcx> {
     }
 
     // convert each exported_macro into a doc item
-    fn visit_macro(&self, def: &hir::MacroDef) -> Macro {
+    fn visit_local_macro(&self, def: &hir::MacroDef) -> Macro {
         // Extract the spans of all matchers. They represent the "interface" of the macro.
         let matchers = def.body.chunks(4).map(|arm| arm[0].get_span()).collect();
 
         Macro {
-            id: def.id,
+            def_id: self.cx.tcx.map.local_def_id(def.id),
             attrs: def.attrs.clone(),
             name: def.name,
             whence: def.span,