It compiles

Spigot-Server-Patches/Async-Chunk-placeholder.patch

@@ -0,0 +1,38 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <Spottedleaf@users.noreply.github.com>
+Date: Mon, 6 May 2019 12:29:24 -0700
+Subject: [PATCH] Async Chunk placeholder
+
+Until we figure out Mojang's ticket system.
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index d2c3ea0dc3..f4ce7c59c8 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -0,0 +0,0 @@ import java.util.Objects;
+ import java.util.Random;
+ import java.util.Set;
+ import java.util.UUID;
++import java.util.concurrent.CompletableFuture;
+ import java.util.function.Predicate;
+ import net.minecraft.server.AxisAlignedBB;
+ import net.minecraft.server.BiomeBase;
+@@ -0,0 +0,0 @@ public class CraftWorld implements World {
+         return (nearest == null) ? null : new Location(this, nearest.getX(), nearest.getY(), nearest.getZ());
+     }
+ 
++    // Paper start
++
++    @Override
++    public CompletableFuture<Chunk> getChunkAtAsync(int x, int z, boolean gen) {
++        // TODO placeholder
++        CompletableFuture<Chunk> ret = new CompletableFuture<>();
++        ret.complete(getChunkAt(x, z));
++        return ret;
++    }
++    // Paper end
++
+     // Spigot start
+     private final Spigot spigot = new Spigot()
+     {
+--