Ensure Context is Send.

tarpc/Cargo.toml

@@ -35,6 +35,7 @@ pin-project = "0.4.17"
 rand = "0.7"
 tokio = { version = "0.2", features = ["time"] }
 serde = { optional = true, version = "1.0", features = ["derive"] }
+static_assertions = "1.1.0"
 tokio-util = { optional = true, version = "0.2" }
 tarpc-plugins = { path = "../plugins", version = "0.8" }
 tokio-serde = { optional = true, version = "0.6" }

tarpc/src/rpc/context.rs

@@ -8,6 +8,7 @@
 //! client to server and is used by the server to enforce response deadlines.
 
 use crate::trace::{self, TraceId};
+use static_assertions::assert_impl_all;
 use std::time::{Duration, SystemTime};
 
 /// A request context that carries request-scoped information like deadlines and trace information.
@@ -38,6 +39,8 @@ pub struct Context {
     pub trace_context: trace::Context,
 }
 
+assert_impl_all!(Context: Send);
+
 #[cfg(feature = "serde1")]
 fn ten_seconds_from_now() -> SystemTime {
     SystemTime::now() + Duration::from_secs(10)