FastQuit

Evidence

Ran on Kiln's test stand (2026-11-04): FastQuit did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/screens/GenericMessageScreen.

What it needs from Kiln

• Mixin
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.screens.GenericMessageScreen
• net.minecraft.client.server.IntegratedServer
• net.minecraft.network.chat.CommonComponents
• net.minecraft.network.chat.Style
• net.minecraft.util.DirectoryLock
• net.minecraft.world.level.storage.LevelStorageSource
• net.minecraft.world.level.storage.LevelStorageSource.LevelDirectory
• net.minecraft.world.level.storage.LevelStorageSource.LevelStorageAccess
• net.minecraft.world.level.storage.WorldData
• FabricLoader.getModContainer()
• FabricLoader.isModLoaded()
• Minecraft.isSameThread()
• Minecraft.setScreenAndShow()
• Minecraft.submit()
• MutableComponent.withStyle()

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

Lets you return to the Title Screen early while your world is still saving in the background!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file fastquit-3.1.5+mc26.2.jar. The scan reads the mod's classes; it does not run them.