macro io_ext_impl($stdio_ty:ty, $stdio_lock_ty:ty, $writer:literal) {
...
}Available on non-Hermit and (Unix) and not ((WebAssembly and non-WASI, or Fortanix and SGX)) only.
macro io_ext_impl($stdio_ty:ty, $stdio_lock_ty:ty, $writer:literal) {
...
}