1 2 3 4 5 6 7 8 9 10 11 12 13
//! Parenthesis helper pub(crate) struct Parenthesized<T>(pub(crate) T); impl<T> syn::parse::Parse for Parenthesized<T> where T: syn::parse::Parse, { fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> { let content; syn::parenthesized!(content in input); content.parse::<T>().map(Parenthesized) } }