Bump to Rust 2024 edition

gc/mmtk/Cargo.toml

@@ -2,7 +2,7 @@
 name = "mmtk_ruby"
 version = "0.1.0"
 authors = []
-edition = "2021"
+edition = "2024"
 
 [lib]
 name = "mmtk_ruby"

gc/mmtk/src/abi.rs

@@ -1,6 +1,6 @@
+use crate::Ruby;
 use crate::api::RubyMutator;
 use crate::extra_assert;
-use crate::Ruby;
 use libc::c_int;
 use mmtk::scheduler::GCWorker;
 use mmtk::util::Address;

gc/mmtk/src/active_plan.rs

@@ -1,12 +1,12 @@
 use std::collections::VecDeque;
 use std::marker::PhantomData;
 
+use crate::Ruby;
 use crate::mmtk;
 use crate::upcalls;
-use crate::Ruby;
+use mmtk::Mutator;
 use mmtk::util::opaque_pointer::*;
 use mmtk::vm::ActivePlan;
-use mmtk::Mutator;
 
 pub struct VMActivePlan {}