fix return value of run not captured

src/main/java/carpet/fakes/CommandSourceStackInterface.java

@@ -0,0 +1,10 @@
+package carpet.fakes;
+
+import net.minecraft.commands.CommandResultCallback;
+import net.minecraft.commands.CommandSigningContext;
+import net.minecraft.commands.arguments.EntityAnchorArgument;
+import net.minecraft.util.TaskChainer;
+
+public interface CommandSourceStackInterface {
+    void setupPrivates(boolean bl, CommandResultCallback commandResultCallback, EntityAnchorArgument.Anchor anchor, CommandSigningContext commandSigningContext, TaskChainer taskChainer);
+}

src/main/java/carpet/mixins/CommandSourceStack_scarpetMixin.java

@@ -0,0 +1,29 @@
+package carpet.mixins;
+
+import carpet.fakes.CommandSourceStackInterface;
+import net.minecraft.commands.CommandResultCallback;
+import net.minecraft.commands.CommandSigningContext;
+import net.minecraft.commands.CommandSourceStack;
+import net.minecraft.commands.arguments.EntityAnchorArgument;
+import net.minecraft.util.TaskChainer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Mutable;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin(CommandSourceStack.class)
+public class CommandSourceStack_scarpetMixin implements CommandSourceStackInterface {
+    @Mutable @Shadow private boolean silent;
+    @Mutable @Shadow private CommandResultCallback resultCallback;
+    @Mutable @Shadow private EntityAnchorArgument.Anchor anchor;
+    @Mutable @Shadow private CommandSigningContext signingContext;
+    @Mutable @Shadow private TaskChainer chatMessageChainer;
+
+    @Override
+    public void setupPrivates(boolean bl, CommandResultCallback commandResultCallback, EntityAnchorArgument.Anchor anchor, CommandSigningContext commandSigningContext, TaskChainer taskChainer) {
+        this.silent = bl;
+        this.resultCallback = commandResultCallback;
+        this.anchor = anchor;
+        this.signingContext = commandSigningContext;
+        this.chatMessageChainer = taskChainer;
+    }
+}

src/main/java/carpet/script/utils/SnoopyCommandSource.java

@@ -1,5 +1,6 @@
 package carpet.script.utils;
 
+import carpet.fakes.CommandSourceStackInterface;
 import carpet.script.external.Vanilla;
 import net.minecraft.commands.CommandResultCallback;
 import net.minecraft.commands.CommandSigningContext;
@@ -66,6 +67,7 @@ public class SnoopyCommandSource extends CommandSourceStack
         this.chatOutput = chatOutput;
         this.signingContext = original.getSigningContext();
         this.taskChainer = TaskChainer.immediate(original.getServer());
+        ((CommandSourceStackInterface) this).setupPrivates(false, (b, i) -> returnValue[0] = OptionalLong.of(i), EntityAnchorArgument.Anchor.FEET, CommandSigningContext.ANONYMOUS, TaskChainer.immediate(original.getServer()));
     }
 
     public SnoopyCommandSource(ServerPlayer player, Component[] error, List<Component> output, int [] result)
@@ -89,6 +91,7 @@ public class SnoopyCommandSource extends CommandSourceStack
         this.chatOutput = output;
         this.signingContext = CommandSigningContext.ANONYMOUS;
         this.taskChainer = TaskChainer.immediate(player.level().getServer());
+        ((CommandSourceStackInterface) this).setupPrivates(false, (b, i) -> result[0] = i, EntityAnchorArgument.Anchor.FEET, CommandSigningContext.ANONYMOUS, TaskChainer.immediate(player.level().getServer()));
     }
 
     private SnoopyCommandSource(CommandSource output, Vec3 pos, Vec2 rot, ServerLevel world, PermissionSet level, String simpleName, Component name, MinecraftServer server, @Nullable Entity entity, CommandResultCallback consumer, EntityAnchorArgument.Anchor entityAnchor, CommandSigningContext context, TaskChainer chainer,
@@ -114,6 +117,7 @@ public class SnoopyCommandSource extends CommandSourceStack
         this.chatOutput = chatOutput;
         this.signingContext = context;
         this.taskChainer = chainer;
+        ((CommandSourceStackInterface) this).setupPrivates(false, consumer, entityAnchor, context, chainer);
     }
 
     @Override