1 files changed, 3 insertions, 1 deletions
diff --git a/src/lua/runnable.rs b/src/lua/runnable.rs
index adda512..683d191 100644
--- a/src/lua/runnable.rs
+++ b/src/lua/runnable.rs
@@ -5,6 +5,7 @@ use super::ownedfunction::OwnedFunction;
 pub trait Runnable<A, R>
 where
     Self: Send,
+    R: ?Sized
 {
     fn run<'lua>(&self, arg: A, lua: &'lua Lua) -> Result<R>
     where
@@ -16,6 +17,7 @@ impl<A, R, T> Runnable<A, R> for T
 where
     T: Fn(A) -> R,
     Self: Send,
+    R: ?Sized
 {
     fn run<'lua>(&self, arg: A, _: &'lua Lua) -> Result<R>
     where
@@ -29,6 +31,7 @@ where
 impl<A, R> Runnable<A, R> for OwnedFunction
 where
     Self: Send,
+    R: ?Sized
 {
     fn run<'lua>(&self, arg: A, lua: &'lua Lua) -> Result<R>
     where
@@ -39,4 +42,3 @@ where
         func.call::<A, R>(arg)
     }
 }
-