Programming Languages which Implement Compile-Time Checked Type Guards?

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  • lobster

    The Lobster Programming Language

  • It appears the guards are relatively simple, like you can't do special string or number subclasses for example. I'm basically wondering, are there any languages which can do type guards but make them more advanced? And can they do them at compile time, or must they be checked at runtime? I am thinking of Lobster and their "Flow-Sensitive Type-Inference and Specialization" ideas.

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