| use proc_macro2::{Punct, Spacing, TokenStream}; |
| |
| // None of our generated code requires the `From::from` error conversion |
| // performed by the standard library's `try!` macro. With this simplified macro |
| // we see a significant improvement in type checking and borrow checking time of |
| // the generated code and a slight improvement in binary size. |
| pub fn replacement() -> TokenStream { |
| // Cannot pass `$expr` to `quote!` prior to Rust 1.17.0 so interpolate it. |
| let dollar = Punct::new('$', Spacing::Alone); |
| |
| quote! { |
| #[allow(unused_macros)] |
| macro_rules! try { |
| (#dollar __expr:expr) => { |
| match #dollar __expr { |
| _serde::__private::Ok(__val) => __val, |
| _serde::__private::Err(__err) => { |
| return _serde::__private::Err(__err); |
| } |
| } |
| } |
| } |
| } |
| } |