Lots of owork on a calculator example, transparency, etc.

lib/runtime/src/fs.rs

@@ -8,11 +8,12 @@
 //! The public surface intentionally mirrors `std::fs` where that shape makes sense, while using
 //! async methods for operations that may block the caller.
 
+use alloc::sync::Arc;
+
 use std::ffi::OsStr;
 use std::io;
 use std::os::fd::{AsRawFd, OwnedFd};
 use std::path::{Path, PathBuf};
-use std::sync::Arc;
 
 use crate::op::fs::{
     FileType as RawFileType, FsOp, MetadataTarget, OpenOptions as OpOpenOptions,