Bump edition to 2024

Author: sourcefrog

Cargo.toml

@@ -1,15 +1,15 @@
 [package]
 name = "cargo-mutants"
 version = "26.0.1"
-edition = "2021"
+edition = "2024"
 authors = ["Martin Pool"]
 license = "MIT"
 description = "Inject bugs and see if your tests catch them"
 repository = "https://github.com/sourcefrog/cargo-mutants"
 homepage = "https://mutants.rs/"
 categories = ["development-tools::testing"]
 keywords = ["testing", "mutants", "cargo", "mutation-testing", "coverage"]
-rust-version = "1.78"
+rust-version = "1.88"
 
 [package.metadata.wix]
 upgrade-guid = "CA7BFE8D-F3A7-4D1D-AE43-B7749110FA90"

src/fnvalue.rs

@@ -339,7 +339,7 @@ fn known_map(path: &Path) -> Option<(&Ident, &Type, &Type)> {
     {
         // TODO: Skip lifetime args.
         // TODO: Return the path with args stripped out.
-        if let Some((GenericArgument::Type(ref key_type), GenericArgument::Type(ref value_type))) =
+        if let Some((GenericArgument::Type(key_type), GenericArgument::Type(value_type))) =
             args.iter().collect_tuple()
         {
             return Some((&last.ident, key_type, value_type));
@@ -441,7 +441,7 @@ fn match_first_type_arg<'p>(path: &'p Path, expected_ident: &str) -> Option<&'p
 mod test {
     use itertools::Itertools;
     use pretty_assertions::assert_eq;
-    use syn::{parse_quote, Expr, ReturnType};
+    use syn::{Expr, ReturnType, parse_quote};
 
     use crate::fnvalue::match_impl_iterator;
     use crate::pretty::ToPrettyString;