Add async feature to conditionally use LocalSet

Author: khvzak

Cargo.toml

@@ -13,14 +13,15 @@ lua52 = ["mlua/lua52"]
 lua53 = ["mlua/lua53"]
 lua54 = ["mlua/lua54"]
 luau = ["mlua/luau"]
+async = ["mlua/async", "dep:tokio", "dep:tokio-util"]
 send = ["mlua/send"]
 vendored = ["mlua/vendored"]
 
 json = ["mlua/serde", "dep:ouroboros", "dep:serde", "dep:serde_json"]
 regex = ["dep:regex", "dep:ouroboros", "dep:quick_cache"]
 yaml = ["mlua/serde", "dep:ouroboros", "dep:serde", "dep:serde_yaml"]
 http = ["dep:http"]
-task = ["dep:tokio", "dep:tokio-util", "mlua/async"]
+task = ["async"]
 
 [dependencies]
 mlua = { version = "0.11" }

src/macros.rs

@@ -1,3 +1,5 @@
+#![allow(unused_macros)]
+
 macro_rules! lua_try {
     ($result:expr) => {
         match $result {

tests/lib.rs

@@ -31,10 +31,15 @@ async fn run_file(modname: &str) -> Result<()> {
     let path = format!("tests/lua/{modname}_tests.lua");
     lua.load(Path::new(&path)).exec()?;
 
-    let local = tokio::task::LocalSet::new();
-    let (ok, _results) = local
-        .run_until(testing.call_async_method::<(bool, Table)>("run", ()))
-        .await?;
+    #[cfg(feature = "async")]
+    let (ok, _results) = {
+        let local = tokio::task::LocalSet::new();
+        local
+            .run_until(testing.call_async_method::<(bool, Table)>("run", ()))
+            .await?
+    };
+    #[cfg(not(feature = "async"))]
+    let (ok, _results) = testing.call_method::<(bool, Table)>("run", ())?;
     if ok {
         return Ok(());
     }