CRITICAL: Use for type-driven design. Triggers: type state, PhantomData, newtype, marker trait, builder pattern, make invalid states unrepresentable, compile-time validation, sealed trait, ZST, 类型状态, 新类型模式, 类型驱动设计
Install with Tessl CLI
npx tessl i github:actionbook/rust-skills --skill m05-type-driven89
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npx tessl skill review --optimize ./path/to/skillValidation for skill structure
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