fix rust guest to actually mutate shared state

Author: pchickey

test-programs/src/bin/test.rs

@@ -8,19 +8,25 @@ wit_bindgen::generate!({
     }"
 });
 
-const IS_INITIALIZED: Cell<bool> = Cell::new(false);
+// rustc won't allow using a a Cell in a static, but since this is a component (which is always
+// single-threaded) we can ignore this and mark it send and sync.
+struct MakeSendSync<T>(T);
+unsafe impl<T> Send for MakeSendSync<T> {}
+unsafe impl<T> Sync for MakeSendSync<T> {}
+
+static IS_INITIALIZED: MakeSendSync<Cell<bool>> = MakeSendSync(Cell::new(false));
 
 struct S;
 impl Guest for S {
     fn component_init() {
-        let before = IS_INITIALIZED.replace(true);
+        let before = IS_INITIALIZED.0.replace(true);
         assert!(!before, "component should only be initialized once");
     }
 }
 
 export!(S);
 
 fn main() {
-    let initialized = IS_INITIALIZED.get();
+    let initialized = IS_INITIALIZED.0.get();
     assert!(initialized, "component was not initialized")
 }

wasmtime/tests/rust.rs

@@ -84,12 +84,9 @@ async fn init_rust() -> Result<()> {
 
     let initialized_component = component_init_wasmtime::initialize(&component).await?;
 
-    /*
-    // TODO: execute `component`. it should not trap.
     execute(&initialized_component)
         .await
         .context("execute initialized component")?;
-    */
 
     Ok(())
 }