ast::ItemKind::Fn: use ast::FnSig

src/libsyntax/print/pprust.rs

@@ -1199,11 +1199,11 @@ impl<'a> State<'a> {
                 self.s.word(";");
                 self.end(); // end the outer cbox
             }
-            ast::ItemKind::Fn(ref decl, header, ref param_names, ref body) => {
+            ast::ItemKind::Fn(ref sig, ref param_names, ref body) => {
                 self.head("");
                 self.print_fn(
-                    decl,
-                    header,
+                    &sig.decl,
+                    sig.header,
                     Some(item.ident),
                     param_names,
                     &item.vis