rustfmt: set style_edition = "2024"

.rustfmt.toml

@@ -8,7 +8,6 @@ error_on_line_overflow = true
 # Override the default formatting style.
 # See https://internals.rust-lang.org/t/running-rustfmt-on-rust-lang-rust-and-other-rust-lang-repositories/8732/81.
 use_small_heuristics = "Max"
-# This is the default of 2024 edition https://github.com/rust-lang/rust/pull/114764.
 # This is unstable (tracking issue: https://github.com/rust-lang/rustfmt/issues/3370)
 overflow_delimited_expr = true
 # This is unstable (tracking issue: https://github.com/rust-lang/rustfmt/issues/4991).
@@ -27,6 +26,7 @@ use_try_shorthand = true
 # Set the default settings again to always apply the proper formatting without
 # being affected by the editor settings.
 edition = "2018"
+style_edition = "2024"
 hard_tabs = false
 newline_style = "Unix"
 tab_spaces = 4

src/ast.rs

@@ -2,7 +2,7 @@
 
 use proc_macro::{Delimiter, Ident, Literal, Span, TokenStream, TokenTree};
 
-use crate::{iter::TokenIter, to_tokens::ToTokens, utils::tt_span, Result};
+use crate::{Result, iter::TokenIter, to_tokens::ToTokens, utils::tt_span};
 
 pub(crate) struct Func {
     attrs: Vec<Attribute>,

src/iter.rs

@@ -2,7 +2,7 @@
 
 // Based on https://github.com/dtolnay/proc-macro-hack/blob/0.5.19/src/iter.rs
 
-use proc_macro::{token_stream, Delimiter, TokenStream, TokenTree};
+use proc_macro::{Delimiter, TokenStream, TokenTree, token_stream};
 
 pub(crate) struct TokenIter {
     stack: Vec<token_stream::IntoIter>,

src/utils.rs

@@ -4,7 +4,7 @@ use std::iter::FromIterator;
 
 use proc_macro::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree};
 
-use crate::{iter::TokenIter, Result};
+use crate::{Result, iter::TokenIter};
 
 pub(crate) fn tt_span(tt: Option<&TokenTree>) -> Span {
     tt.map_or_else(Span::call_site, TokenTree::span)

test_suite/build.rs

@@ -4,7 +4,9 @@ use std::{env, process::Command};
 
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
-    println!("cargo:rustc-check-cfg=cfg(rustc_1_31,rustc_1_33,rustc_1_39,rustc_1_46,rustc_1_61,rustc_1_83,const_unstable)");
+    println!(
+        "cargo:rustc-check-cfg=cfg(rustc_1_31,rustc_1_33,rustc_1_39,rustc_1_46,rustc_1_61,rustc_1_83,const_unstable)"
+    );
 
     let cfg = autocfg::new();
     if cfg.probe_rustc_version(1, 31) {