Reduce compiler warnings in testethcalls

tests/testethcalls.nim

@@ -43,27 +43,42 @@ server.rpc(rpcDynamicName "testReturnUint256") do() -> UInt256:
   let r: UInt256 = "0x1234567890abcdef".parse(UInt256, 16)
   return r
 
-proc testLocalCalls: Future[seq[JsonString]] =
+proc testLocalCalls: Future[seq[JsonString]] {.async.} =
   ## Call RPCs created with `rpc` locally.
   ## This simply demonstrates async calls of the procs generated by the `rpc` macro.
   let
     uint256Param =  server.executeMethod("rpc.uint256Param", %[%"0x1234567890"])
     returnUint256 = server.executeMethod("rpc.testReturnUint256", %[])
-  return all(uint256Param, returnUint256)
 
-proc testRemoteUInt256: Future[seq[JsonString]] =
+  await noCancel(allFutures(uint256Param, returnUint256))
+  var pending: seq[JsonString]
+  pending.add uint256Param.read()
+  pending.add returnUint256.read()
+  return pending
+
+proc testRemoteUInt256: Future[seq[JsonString]] {.async.} =
   ## Call function remotely on server, testing `stint` types
   let
     uint256Param =  client.call("rpc.uint256Param", %[%"0x1234567890"])
     returnUint256 = client.call("rpc.testReturnUint256", %[])
-  return all(uint256Param, returnUint256)
 
-proc testSigCalls: Future[seq[string]] =
+  await noCancel(allFutures(uint256Param, returnUint256))
+  var pending: seq[JsonString]
+  pending.add uint256Param.read()
+  pending.add returnUint256.read()
+  return pending
+
+proc testSigCalls: Future[seq[string]] {.async.} =
   ## Remote call using proc generated from signatures in `ethcallsigs.nim`
   let
     version = client.web3_clientVersion()
     sha3 = client.web3_sha3("0x68656c6c6f20776f726c64")
-  return all(version, sha3)
+
+  await noCancel(allFutures(version, sha3))
+  var pending: seq[string]
+  pending.add version.read()
+  pending.add sha3.read()
+  return pending
 
 server.start()
 waitFor client.connect(server.localAddress()[0])