Example of creating a Gist using Python

init-deep-dive_rust-proc-macro.rs

struct Condition(Expr);

impl Parse for Condition {
    fn parse(input: ParseStream) -> syn::Result<Self> {
        _ = input.parse::<Token![if]>()?;
        input.parse().map(Self)
    }
}

impl ToTokens for Condition {
    fn to_tokens(&self, tokens: &mut TokenStream2) {
        self.0.to_tokens(tokens)
    }
}