Async trait function error (#1311)

* adds fixme

* add failing interface

* update wit

* comment update

* update wit

* use .get in case of asyncmethod as well

* cleanup

---------

Co-authored-by: Elmer Bulthuis <elmerbulthuis@gmail.com>

Author: elmerbulthuis

crates/rust/src/bindgen.rs

@@ -897,7 +897,10 @@ impl Bindgen for FunctionBindgen<'_, '_> {
                     // Automatically convert `Borrow<'_, AResource>` to
                     // `&Self` since traits have `&self` as their
                     // first arguments.
-                    if i == 0 && matches!(func.kind, FunctionKind::Method(_)) {
+                    if i == 0
+                        && (matches!(func.kind, FunctionKind::Method(_))
+                            || matches!(func.kind, FunctionKind::AsyncMethod(_)))
+                    {
                         self.push_str(".get()")
                     }
                 }

tests/codegen/async-trait-function.wit

@@ -0,0 +1,11 @@
+package wha:hoo;
+
+interface iii {
+  resource rrr {
+    fff: async func();
+  }
+}
+
+world core {
+  export iii;
+}