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Fix link to external scala spec pdf #69

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Fix link to external scala spec pdf #69

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2 changes: 1 addition & 1 deletion sections/2-language-rules.md
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Expand Up @@ -25,7 +25,7 @@ def action = Action { request =>
In Scala, a `return` statement inside a nested anonymous function is
implemented by throwing and catching a `NonLocalReturnException`. It
says so in the
[Scala Language Specification, section 6.20](http://www.scala-lang.org/docu/files/ScalaReference.pdf).
[Scala Language Specification, section 6.20](https://scala-lang.org/files/archive/spec/2.13/spec.pdf).

Besides, `return` is anti structural programming, as functions can be
described with multiple exit points and if you need `return`, like in
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