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Twostate greatest predicates #1296

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fpoli opened this issue Jul 13, 2021 · 1 comment
Open

Twostate greatest predicates #1296

fpoli opened this issue Jul 13, 2021 · 1 comment
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kind: enhancement Enhancements, feature requests, etc. These are NOT bugs, but ways we can improve Dafny part: language definition Relating to the Dafny language definition itself

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@fpoli
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fpoli commented Jul 13, 2021

Are twostate greatest predicates supported? The following program fails with Error: lemma expected.

greatest predicate foo() { true } // Ok

twostate greatest predicate bar() { true } // Error: lemma expected
@RustanLeino
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A greatest predicate currently does not support twostate. It could, in principle, so I'll mark this issue as a feature request. It's not common for least/greatest predicates to make any use of the heap.

@RustanLeino RustanLeino added the kind: enhancement Enhancements, feature requests, etc. These are NOT bugs, but ways we can improve Dafny label Jul 13, 2021
@keyboardDrummer keyboardDrummer added the part: language definition Relating to the Dafny language definition itself label Jul 19, 2021
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kind: enhancement Enhancements, feature requests, etc. These are NOT bugs, but ways we can improve Dafny part: language definition Relating to the Dafny language definition itself
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