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-rw-r--r--src/sandbox.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/sandbox.rs b/src/sandbox.rs
index 698578f4..60e3be14 100644
--- a/src/sandbox.rs
+++ b/src/sandbox.rs
@@ -81,7 +81,7 @@ pub trait Sandbox {
/// The type of __messages__ your [`Sandbox`] will produce.
///
/// [`Sandbox`]: trait.Sandbox.html
- type Message: std::fmt::Debug + Send;
+ type Message: std::fmt::Debug + Send + Clone;
/// Initializes the [`Sandbox`].
///