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    <p>To simply answer your question "... why is Scala's type system not a library in Clojure?":</p> <p>Because the type system is part of the scala compiler and not of the scala library. The whole power of scalas type system only exists at compile time. The JVM has no support for things like that, because of type erasure and also, because it would simply slow down execution. And also there is no need for it. If you have a statically typed language, you don't need type information at runtime, unless you want to do dirty stuff.</p> <p>edit:</p> <p>@mikera the jvm is sure capable of running the scala compiler, I did not say anything like that. I just said, that the jvm has no support for type systems like that. It does not even support generics. At runtime all these types are gone. The compiler checks for the correctness of a program and removes all the higher kinded types / generics.</p> <p>example:</p> <pre><code>val xs: List[Int] = List(1,2,3,4) val x1: Int = xs.head </code></pre> <p>will at runtime look like this:</p> <pre><code>val xs: List = List.apply(1,2,3,4) val x1: Int = xs.head.asInstanceOf[Int] </code></pre> <p>But it doesn't matter, because the compiler checked it before. You can only get in trouble here, when you use reflection, because you could put any value in the list and it would break at runtime exactly where the value is casted to <code>Int</code>.</p> <p>And this is one of the reasons, why the scala type system is not part of the scala library, but built into the compiler.</p> <p>And also the question of the OP was "... why is Scala's type system not a library in Clojure?" and not "Is it possible to create a type system such as scalas for clojure?" and I perfectly answered that question.</p>
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    1. COThe JVM is perfectly capable of running a compiler with a Scala-style type system. Scala itself couldn't exist if this wasn't possible, since Scala's compiler (as well as the code after it is compiled) runs on the JVM!
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    2. COupdated my post
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