notify failing on MacOS with new fsevent-sys update

[NathanSWard]

System details

• OS/Platform name and version: MacOS - latest
• Rust version (if building from source): rustc --version: 1.52
• Notify version (or commit hash if building from git):
  In Cargo.toml
  notify = { version = "5.0.0-pre.2", optional = true }

What you did (as detailed as you can)

On the bevy github page, our CI builds are failing due to a recent update within the fsevent-sys crate.
See CI failures here;

What you expected

No CI failure on a simple minor release version change.

What happened

CI failed due to:

error[E0308]: mismatched types
   --> /Users/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/notify-5.0.0-pre.7/src/fsevent.rs:361:17
    |
361 |                 callback,
    |                 ^^^^^^^^ expected `u32`, found enum `c_void`
    |
    = note: expected fn pointer `extern "C" fn(_, _, _, _, *const u32, *const u64)`
                  found fn item `extern "C" fn(_, _, _, _, *const c_void, *const c_void) {callback}`

[NathanSWard]

This could be fixed by changing the fsevent-sys version dependency to fsevent-sys = "3.1" in the Cargo.toml`.

[target.'cfg(target_os="macos")'.dependencies]
fsevent = "2.0.1"
fsevent-sys = "3.1"

[0xpr03]

cc @erickt is this related to your recent PRs ?

[erickt]

@0xpr03 - yeah, it looks like the API change I made to fsevent was done in a minor version, rather than major API change. I'll submit a fix.

[0xpr03]

Released as 5.0.0-pre.8
v4 shouldn't be affected