Refactor to assert that Send but not Sync is implemented

Author: ptravers

Cargo.toml

@@ -27,6 +27,9 @@ indexmap = { version = "1.1.0", optional = true }
 smallvec = { version = "1.0.0", optional = true }
 bytes = { version = "0.5", optional = true }
 
+[dev-dependencies]
+static_assertions = "1.1.0"
+
 [features]
 default = ["smallvec"]
 indexed = ["indexmap"]

src/lib.rs

@@ -431,3 +431,10 @@ where
         .with_meta(meta)
         .construct()
 }
+
+
+#[test]
+fn is_not_sync() {
+    extern crate static_assertions as sa;
+    sa::assert_not_impl_all!(ReadHandle<(), ()>: Send, Sync);
+}