--- /dev/null
+use proc_macro2::TokenStream;
+use quote::ToTokens;
+
+pub struct TokensOrDefault<'a, T: 'a>(pub &'a Option<T>);
+
+impl<'a, T> ToTokens for TokensOrDefault<'a, T>
+where
+ T: ToTokens + Default,
+{
+ fn to_tokens(&self, tokens: &mut TokenStream) {
+ match self.0 {
+ Some(t) => t.to_tokens(tokens),
+ None => T::default().to_tokens(tokens),
+ }
+ }
+}