Fixes #1

Problem

Rust 1.94-nightly introduced a breaking change (rust-lang/rust#141402) that forbids raw pointer casts which extend trait object lifetimes:

error: lifetime may not live long enough
   --> src/lib.rs:609:42
    |
556 | fn for_each_raw_imp(n_jobs: usize, task: &(dyn Sync + Fn(usize))) {
    |                                          - let's call the lifetime of this reference `'1`
...
609 |                     let mut task = (&raw const task) as *const TaskInner;
    |                                                         ^^^^^^^^^^^^^^^^ type annotation requires that `'1` must outlive `'static`

Solution

Replace the direct pointer cast with std::mem::transmute:

let task_ref: &(dyn Sync + Fn(usize, &AtomicPtr<PanicLoad>)) = &task;
let mut task: *const TaskInner = std::mem::transmute(task_ref as *const _);

Safety

The transmute is sound because the barrier mechanism (wait_and_clear) guarantees all worker threads complete before the closure is dropped. The task lives on the stack until synchronization completes.

Performance

Zero-cost. transmute is a compile-time type reinterpretation—no runtime instructions generated. Verified via benchmark and assembly inspection.

Testing

• All existing tests pass on both stable and nightly
• Benchmarks show no performance regression