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Use peek2(End) instead of fork/advance_to

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David Tolnay 2024-10-31 16:38:58 -07:00
parent a9a6c98a2e
commit 3d79a908ac
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2 changed files with 4 additions and 6 deletions
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2
impl/Cargo.toml
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@ -14,7 +14,7 @@ proc-macro = true
[dependencies] [dependencies]
proc-macro2 = "1.0.74" proc-macro2 = "1.0.74"
quote = "1.0.35" quote = "1.0.35"
syn = "2.0.46" syn = "2.0.86"
[package.metadata.docs.rs] [package.metadata.docs.rs]
targets = ["x86_64-unknown-linux-gnu"] targets = ["x86_64-unknown-linux-gnu"]

8
impl/src/attr.rs
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@ -2,7 +2,7 @@ use proc_macro2::{Delimiter, Group, Literal, Punct, Spacing, Span, TokenStream,
use quote::{format_ident, quote, ToTokens}; use quote::{format_ident, quote, ToTokens};
use std::collections::BTreeSet as Set; use std::collections::BTreeSet as Set;
use syn::parse::discouraged::Speculative; use syn::parse::discouraged::Speculative;
use syn::parse::ParseStream; use syn::parse::{End, ParseStream};
use syn::{ use syn::{
braced, bracketed, parenthesized, token, Attribute, Error, Ident, Index, LitFloat, LitInt, braced, bracketed, parenthesized, token, Attribute, Error, Ident, Index, LitFloat, LitInt,
LitStr, Meta, Result, Token, LitStr, Meta, Result, Token,
@ -111,10 +111,8 @@ fn parse_error_attribute<'a>(attrs: &mut Attrs<'a>, attr: &'a Attribute) -> Resu
return Err(lookahead.error()); return Err(lookahead.error());
}; };
let ahead = input.fork(); let args = if input.is_empty() || input.peek(Token![,]) && input.peek2(End) {
ahead.parse::<Option<Token![,]>>()?; input.parse::<Option<Token![,]>>()?;
let args = if ahead.is_empty() {
input.advance_to(&ahead);
TokenStream::new() TokenStream::new()
} else { } else {
parse_token_expr(input, false)? parse_token_expr(input, false)?