runtime/wasm: Fix mock Ethereum adapter
@@ -68,7 +68,7 @@ impl EthereumAdapter for MockEthereumAdapter {
fn contract_call(
&self,
call: EthereumContractCall,
- ) -> Box<Future<Item = Vec<Token>, Error = EthereumContractCallError>> {
+ ) -> Box<Future<Item = Vec<Token>, Error = EthereumContractCallError> + Send> {
unimplemented!();
}
}
