auto merge of #8718 : bblum/rust/typeof, r=pcwalton

r? anybody

src/libsyntax/ast.rs

@@ -791,6 +791,7 @@ pub enum ty_ {
     ty_tup(~[Ty]),
     ty_path(Path, Option<OptVec<TyParamBound>>, NodeId), // for #7264; see above
     ty_mac(mac),
+    ty_typeof(@expr),
     // ty_infer means the type should be inferred instead of it having been
     // specified. This should only appear at the "top level" of a type and not
     // nested in one.