Auto merge of #336 - vvuk:misc-fix, r=emilio

Silence the 'Unhandled cursor kind' warning for a few things

For toplevel operator overload, and for `CXCursor_UsingDirective`

Author: bors-servo

libbindgen/src/ir/item.rs

@@ -950,16 +950,21 @@ impl ClangItemParser for Item {
                 CXCursor_MacroDefinition |
                 CXCursor_MacroExpansion |
                 CXCursor_UsingDeclaration |
+                CXCursor_UsingDirective |
                 CXCursor_StaticAssert |
                 CXCursor_InclusionDirective => {
                     debug!("Unhandled cursor kind {:?}: {:?}",
                            cursor.kind(),
                            cursor);
                 }
                 _ => {
-                    error!("Unhandled cursor kind {:?}: {:?}",
-                           cursor.kind(),
-                           cursor);
+                    // ignore toplevel operator overloads
+                    let spelling = cursor.spelling();
+                    if !spelling.starts_with("operator") {
+                        error!("Unhandled cursor kind {:?}: {:?}",
+                               cursor.kind(),
+                               cursor);
+                    }
                 }
             }