total rewrite to interface handling; not complete but it compiles

generate/testdata/UsesEnumTwice.graphql.go

@@ -1,15 +1,51 @@
-type Response struct {
-	Me *struct {
-		Roles []role `json:"roles"`
-	}
-	OtherUser *struct {
-		Roles []role `json:"roles"`
-	}
-}
+package test
 
-type role string
+// Code generated by github.com/Khan/genql, DO NOT EDIT.
+
+import (
+	"context"
+
+	"github.com/Khan/genql/graphql"
+)
+
+type Role string
 
 const (
-	studentRole role = "STUDENT"
-	teacherRole role = "TEACHER"
-)
+	StudentRole Role = "STUDENT"
+	TeacherRole Role = "TEACHER"
+)
+
+type Role1 string
+
+const (
+	StudentRole1 Role1 = "STUDENT"
+	TeacherRole1 Role1 = "TEACHER"
+)
+
+type User struct {
+	Roles []Role `json:"roles"`
+}
+
+type User1 struct {
+	Roles []Role1 `json:"roles"`
+}
+
+type UsesEnumTwiceQueryResponse struct {
+	Me        *User
+	OtherUser *User1
+}
+
+func UsesEnumTwiceQuery(client *graphql.Client) (*UsesEnumTwiceQueryResponse, error) {
+	var retval UsesEnumTwiceQueryResponse
+	err := client.MakeRequest(context.Background(), `
+query UsesEnumTwiceQuery {
+	Me: user {
+		roles
+	}
+	OtherUser: user {
+		roles
+	}
+}
+`, &retval, nil)
+	return &retval, err
+}