switch to futures-lite

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

Cargo.toml

@@ -27,6 +27,7 @@ default = [
   "async-io",
   "async-task",
   "blocking",
+  "futures-lite",
   "kv-log-macro",
   "log",
   "num_cpus",
@@ -81,6 +82,7 @@ surf = { version = "1.0.3", optional = true }
 [target.'cfg(not(target_os = "unknown"))'.dependencies]
 async-io = { version = "0.1.5", optional = true }
 blocking = { version = "0.5.0", optional = true }
+futures-lite = { version = "0.1.8", optional = true }
 smol = { version = "0.1.17", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]

src/fs/file.rs

@@ -315,7 +315,7 @@ impl Drop for File {
         // non-blocking fashion, but our only other option here is losing data remaining in the
         // write cache. Good task schedulers should be resilient to occasional blocking hiccups in
         // file destructors so we don't expect this to be a common problem in practice.
-        let _ = smol::block_on(self.flush());
+        let _ = futures_lite::future::block_on(self.flush());
     }
 }
 

src/task/builder.rs

@@ -169,7 +169,7 @@ impl Builder {
                         // The first call should use run.
                         smol::run(wrapped)
                     } else {
-                        smol::block_on(wrapped)
+                        futures_lite::future::block_on(wrapped)
                     };
                     num_nested_blocking.replace(num_nested_blocking.get() - 1);
                     res