Failing compilation for RPC using struct

wire-golden-files/build.gradle.kts

@@ -4,7 +4,27 @@ plugins {
   id("com.squareup.wire")
 }
 
+dependencies {
+  implementation(projects.wireGrpcClient)
+}
+
 wire {
+  kotlin {
+    includes = listOf("squareup.wire.service.*")
+    out = "src/main/kotlin"
+    exclusive = false
+    rpcRole = "client"
+    rpcCallStyle = "suspending"
+  }
+
+  kotlin {
+    includes = listOf("squareup.wire.service.*")
+    out = "src/main/kotlin"
+    exclusive = true
+    rpcRole = "server"
+    rpcCallStyle = "blocking"
+  }
+
   kotlin {
     includes = listOf("squareup.wire.buildersonly.*")
     out = "src/main/kotlin"
@@ -22,3 +42,8 @@ wire {
     out = "src/main/kotlin"
   }
 }
+
+java {
+  sourceCompatibility = JavaVersion.VERSION_1_8
+  targetCompatibility = JavaVersion.VERSION_1_8
+}

wire-golden-files/src/main/kotlin/squareup/wire/service/GrpcMyServiceClient.kt

@@ -0,0 +1,21 @@
+// Code generated by Wire protocol buffer compiler, do not edit.
+// Source: squareup.wire.service.MyService in squareup/wire/service.proto
+package squareup.wire.service
+
+import com.squareup.wire.GrpcCall
+import com.squareup.wire.GrpcClient
+import com.squareup.wire.GrpcMethod
+import com.squareup.wire.ProtoAdapter
+import kotlin.String
+import kotlin.collections.Map
+
+public class GrpcMyServiceClient(
+  private val client: GrpcClient,
+) : MyServiceClient {
+  override fun CreateOrder(): GrpcCall<Map<String, *>?, Map<String, *>?> =
+      client.newCall(GrpcMethod(
+      path = "/squareup.wire.service.MyService/CreateOrder",
+      requestAdapter = ProtoAdapter.STRUCT_MAP,
+      responseAdapter = ProtoAdapter.STRUCT_MAP
+  ))
+}

wire-golden-files/src/main/kotlin/squareup/wire/service/MyServiceBlockingServer.kt

@@ -0,0 +1,18 @@
+// Code generated by Wire protocol buffer compiler, do not edit.
+// Source: squareup.wire.service.MyService in squareup/wire/service.proto
+package squareup.wire.service
+
+import com.squareup.wire.Service
+import com.squareup.wire.WireRpc
+import kotlin.String
+import kotlin.collections.Map
+
+public interface MyServiceBlockingServer : Service {
+  @WireRpc(
+    path = "/squareup.wire.service.MyService/CreateOrder",
+    requestAdapter = "com.squareup.wire.ProtoAdapter#STRUCT_MAP",
+    responseAdapter = "com.squareup.wire.ProtoAdapter#STRUCT_MAP",
+    sourceFile = "squareup/wire/service.proto",
+  )
+  public fun CreateOrder(request: Map<String, *>?): Map<String, *>?
+}

wire-golden-files/src/main/kotlin/squareup/wire/service/MyServiceClient.kt

@@ -0,0 +1,12 @@
+// Code generated by Wire protocol buffer compiler, do not edit.
+// Source: squareup.wire.service.MyService in squareup/wire/service.proto
+package squareup.wire.service
+
+import com.squareup.wire.GrpcCall
+import com.squareup.wire.Service
+import kotlin.String
+import kotlin.collections.Map
+
+public interface MyServiceClient : Service {
+  public fun CreateOrder(): GrpcCall<Map<String, *>?, Map<String, *>?>
+}

wire-golden-files/src/main/proto/squareup/wire/service.proto

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2023 Square, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+syntax = "proto2";
+package squareup.wire.service;
+
+import "google/protobuf/struct.proto";
+
+service MyService {
+  rpc CreateOrder(google.protobuf.Struct) returns (google.protobuf.Struct);
+}