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Invalid methods actually compiles #312

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Atry opened this issue Jul 3, 2017 · 0 comments

Atry commented Jul 3, 2017 •

edited

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import leon.collection._ // for List
import leon.lang._       // for holds

object Example {
  def rightUnitAppend[T](l1: List[T]): Boolean = {
    l1 ++ Nil() == l1
  }.holds
}

In https://github.com/epfl-lara/leon/blob/master/src/sphinx/neon.rst

If you try to verify this last example you'll face a delicate situation: Leon runs indeterminately until it is either killed or times out. But why does this happen? The proposition doesn't seems more complicated than appendContent. Perhaps even more surprisingly, Leon is able to verify the following:

However, it actually compiles
https://leon.epfl.ch#link/5cd42b18a4baeb936e2bd7ec996b90ab-1

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