diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index df0b4655702..64e99ba205d 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -603,16 +603,17 @@ impl NonCustomPropertyId {
 
     /// See PropertyId::collect_property_completion_keywords.
     fn collect_property_completion_keywords(&self, f: KeywordsCollectFn) {
-        const COLLECT_FUNCTIONS: [&Fn(KeywordsCollectFn);
+        fn do_nothing(_: KeywordsCollectFn) {}
+        const COLLECT_FUNCTIONS: [fn(KeywordsCollectFn);
                                   ${len(data.longhands) + len(data.shorthands)}] = [
             % for prop in data.longhands:
-                &<${prop.specified_type()} as SpecifiedValueInfo>::collect_completion_keywords,
+                <${prop.specified_type()} as SpecifiedValueInfo>::collect_completion_keywords,
             % endfor
             % for prop in data.shorthands:
             % if prop.name == "all":
-                &|_f| {}, // 'all' accepts no value other than CSS-wide keywords
+                do_nothing, // 'all' accepts no value other than CSS-wide keywords
             % else:
-                &<shorthands::${prop.ident}::Longhands as SpecifiedValueInfo>::
+                <shorthands::${prop.ident}::Longhands as SpecifiedValueInfo>::
                     collect_completion_keywords,
             % endif
             % endfor