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Fix a bug related to hide/reveal and recursive functions #5764

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Merged
merged 4 commits into from
Sep 12, 2024
Merged

Fix a bug related to hide/reveal and recursive functions #5764

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854d7d6
Fix issues with hide *
keyboardDrummer Sep 11, 2024
102e499
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keyboardDrummer Sep 11, 2024
dea697d
Merge remote-tracking branch 'origin/master' into revealRecursive
keyboardDrummer Sep 12, 2024
bfeb05e
Fixes
keyboardDrummer Sep 12, 2024
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2 changes: 1 addition & 1 deletion Source/DafnyCore/DafnyCore.csproj
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Expand Up @@ -34,7 +34,7 @@
<PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
<PackageReference Include="System.Runtime.Numerics" Version="4.3.0" />
<PackageReference Include="System.Collections.Immutable" Version="1.7.1" />
<PackageReference Include="Boogie.ExecutionEngine" Version="3.2.4" />
<PackageReference Include="Boogie.ExecutionEngine" Version="3.2.5" />
<PackageReference Include="Tomlyn" Version="0.16.2" />
</ItemGroup>

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3 changes: 3 additions & 0 deletions Source/DafnyCore/Verifier/BoogieGenerator.cs
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Expand Up @@ -85,6 +85,9 @@ public BoogieGenerator(ErrorReporter reporter, ProofDependencyManager depManager
Bpl.Program boogieProgram = ReadPrelude();
if (boogieProgram != null) {
sink = boogieProgram;
foreach (var function in boogieProgram.TopLevelDeclarations.OfType<Bpl.Function>()) {
function.AlwaysRevealed = true;
}
predef = FindPredefinedDecls(boogieProgram);
}
}
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18 changes: 18 additions & 0 deletions Source/IntegrationTests/TestFiles/LitTests/LitTest/ast/reveal/revealFunctions.dfy
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Expand Up @@ -84,4 +84,22 @@ method ReadsClause() {
reveal Obj;
}
}
}

module M1 {
ghost function RecFunc(x: nat): nat {
if x == 0 then 0
else 1 + RecFunc(x - 1)
}
}
module M2 {
import opened M1
lemma Lemma(x: nat)
ensures RecFunc(0) == 0
{
// Because RecFunc is recursive, it uses the fuel related $LS function,
// this was previously hidden by 'hide *', so that the ensures could not be proven
hide *;
reveal RecFunc;
}
}
2 changes: 1 addition & 1 deletion Source/IntegrationTests/TestFiles/LitTests/LitTest/ast/reveal/revealFunctions.dfy.expect
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Expand Up @@ -2,4 +2,4 @@ revealFunctions.dfy(15,12): Error: assertion might not hold
revealFunctions.dfy(22,12): Error: assertion might not hold
revealFunctions.dfy(49,21): Error: assertion might not hold

Dafny program verifier finished with 15 verified, 3 errors
Dafny program verifier finished with 22 verified, 3 errors
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