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More robust scanning for fmt argument expressions

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This commit is contained in:
David Tolnay 2024-11-02 09:36:05 -07:00
parent c0050558f7
commit 2585669fa1
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GPG key ID: F9BA143B95FF6D82
1 changed files with 7 additions and 4 deletions
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11
impl/src/fmt.rs
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@ -1,5 +1,6 @@
use crate::ast::Field;
use crate::attr::{Display, Trait};
use crate::scan_expr::scan_expr;
use proc_macro2::TokenTree;
use quote::{format_ident, quote_spanned};
use std::collections::{BTreeSet as Set, HashMap as Map};
@ -121,14 +122,16 @@ fn explicit_named_args(input: ParseStream) -> Result<Set<Ident>> {
let mut named_args = Set::new();
while !input.is_empty() {
if input.peek(Token![,]) && input.peek2(Ident::peek_any) && input.peek3(Token![=]) {
input.parse::<Token![,]>()?;
input.parse::<Token![,]>()?;
if input.is_empty() {
break;
}
if input.peek(Ident::peek_any) && input.peek2(Token![=]) && !input.peek2(Token![==]) {
let ident = input.call(Ident::parse_any)?;
input.parse::<Token![=]>()?;
named_args.insert(ident);
} else {
input.parse::<TokenTree>()?;
}
scan_expr(input)?;
}
Ok(named_args)