This is a new warning in rust 1.84.

There are two warnings of the form:

```text
warning: a dangling pointer will be produced because the temporary `Vec<*const i8>` will be dropped
    --> test/clone/test_fork.rs:1825:55
     |
1825 |                         in("rsi") execv_argvec(&args).as_ptr(),
     |                                   ------------------- ^^^^^^ this pointer will immediately be invalid
     |                                   |
     |                                   this `Vec<*const i8>` is deallocated at the end of the statement, bind it to a variable to extend its lifetime
     |
     = note: pointers do not have a lifetime; when calling `as_ptr` the `Vec<*const i8>` will be deallocated at the end of the statement because nothing is referencing it as far as the type system is concerned
     = help: for more information, see <https://doc.rust-lang.org/reference/destructors.html>
     = note: `#[warn(dangling_pointers_from_temporaries)]` on by default
```