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Fix empty PVL enums causing verification failure #1248

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Fix empty PVL enums causing verification failure #1248

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14 changes: 8 additions & 6 deletions src/rewrite/vct/rewrite/EnumToDomain.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -124,12 +124,14 @@ case class EnumToDomain[Pre <: Generation]() extends CoercingRewriter[Pre] {
)))

// toIntRange
aDTDeclarations.declare(new ADTAxiom(forall[Post](
T(enum),
e =>
(const(0) <= InlinePattern(toInt(e))) &&
(toInt(e) < const(enum.constants.length)),
)))
if (enum.constants.nonEmpty) {
aDTDeclarations.declare(new ADTAxiom(forall[Post](
T(enum),
e =>
(const(0) <= InlinePattern(toInt(e))) &&
(toInt(e) < const(enum.constants.length)),
)))
}
}._1,
Seq(),
))
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4 changes: 4 additions & 0 deletions test/main/vct/test/integration/examples/TechnicalEnumSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,10 @@ class Test {
enum AB { A, B }
"""

vercors should verify using silicon in "pvl/enum empty" pvl """
enum Empty { }
"""

vercors should verify using silicon in "pvl/enum return" pvl """
enum AB { A, B }

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