An example of minimal self-contained snippet that reproduces specific issue

SangriaReproExample.scala

// Imports that you are using

import sangria.schema._
import sangria.execution._
import sangria.macros._
import sangria.marshalling.circe._
import scala.concurrent.ExecutionContext.Implicits.global

// The schema definition

val QueryType = ObjectType("Query", fields[Unit, Unit](
  Field("hello", StringType, resolve = _ ⇒ "Hello world!")
))

val schema = Schema(QueryType)

// Test query

val query = graphql"{ hello }"

val result = Executor.execute(schema, query)

result.foreach(res ⇒ println(res.spaces2))

// Expected output:
//
//   {
//     "hello": "Hello world!"
//   }

// Actual output:
// 
//   ???