diff -up thunderbird-60.9.0/servo/components/style_traits/values.rs.rust-build thunderbird-60.9.0/servo/components/style_traits/values.rs
--- thunderbird-60.9.0/servo/components/style_traits/values.rs.rust-build	2019-09-06 12:25:57.491129675 +0200
+++ thunderbird-60.9.0/servo/components/style_traits/values.rs	2019-09-06 12:27:54.698509544 +0200
@@ -135,6 +135,7 @@ where
     }
 }
 
+/// Some dummy docs
 #[macro_export]
 macro_rules! serialize_function {
     ($dest: expr, $name: ident($( $arg: expr, )+)) => {
@@ -404,6 +405,7 @@ impl_to_css_for_predefined_type!(::csspa
 impl_to_css_for_predefined_type!(::cssparser::Color);
 impl_to_css_for_predefined_type!(::cssparser::UnicodeRange);
 
+/// Some dummy docs
 #[macro_export]
 macro_rules! define_css_keyword_enum {
     (pub enum $name:ident { $($variant:ident = $css:expr,)+ }) => {