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