Use ThreadId for spawn_local
diff --git a/src/lib.rs b/src/lib.rs
index c4dea41..f5b96ad 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -135,5 +135,5 @@
 pub use crate::task::{spawn, Task};
 pub use crate::waker_fn::waker_fn;
 
-#[cfg(any(unix, windows))]
+#[cfg(feature = "std")]
 pub use crate::task::spawn_local;