async call

rustfmt.toml

@@ -0,0 +1 @@
+edition = "2021"

src/faux_caller.rs

@@ -1,4 +1,4 @@
-use std::{ops::Deref, pin::Pin, rc::Rc, sync::Arc};
+use std::{future::Future, ops::Deref, pin::Pin, rc::Rc, sync::Arc};
 
 use crate::{Faux, MaybeFaux};
 
@@ -14,6 +14,21 @@ pub trait FauxCaller<R>: Sized {
         real_fn(real, input)
     }
 
+    async fn async_call<I, F: Future>(
+        self,
+        real_fn: fn(R, I) -> F,
+        fn_name: &'static str,
+        input: I,
+    ) -> F::Output {
+        if let Some(fake) = self.try_as_faux() {
+            return unsafe { fake.async_foo(real_fn, fn_name, input) }.await;
+        }
+        let real = self
+            .try_into_real()
+            .expect("faux: bug! Should always be real");
+        real_fn(real, input).await
+    }
+
     fn try_as_faux(&self) -> Option<&Faux>;
     fn try_into_real(self) -> Option<R>;
 }