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List patterns: Slice value is assumed to be never null #57457

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merged 19 commits into from
Jan 20, 2022
Merged

List patterns: Slice value is assumed to be never null #57457

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104c8d9
Slice value is always assumed to be not null
alrz Oct 28, 2021
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Add test
alrz Nov 4, 2021
5127879
The annotation on the output type is ignored
alrz Nov 10, 2021
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Merge remote-tracking branch 'origin/main' into slice-value
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alrz Jan 11, 2022
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Merge remote-tracking branch 'origin/main' into slice-value
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6 changes: 5 additions & 1 deletion src/Compilers/CSharp/Portable/Binder/DecisionDagBuilder.cs
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Expand Up @@ -421,8 +421,12 @@ private static void MakeCheckNotNull(
ArrayBuilder<Tests> tests)
{
// Add a null test if needed
if (input.Type.CanContainNull())
if (input.Type.CanContainNull() &&
// The slice value is assumed to be never null
input.Source is not BoundDagSliceEvaluation)
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{
tests.Add(new Tests.One(new BoundDagNonNullTest(syntax, isExplicitTest, input)));
}
}

/// <summary>
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1 change: 1 addition & 0 deletions src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker_Patterns.cs
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Expand Up @@ -514,6 +514,7 @@ public PossiblyConditionalState Clone()
var outputSlot = makeDagTempSlot(type, output);
Debug.Assert(outputSlot > 0);
addToTempMap(output, outputSlot, type.Type);
this.State[outputSlot] = NullableFlowState.NotNull; // Slice value is assumed to be never null
Comment on lines 516 to +517
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@alrz alrz Jan 19, 2022 •
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❓ Should we also strip the annotation on the return type for semantic model?

I am not sure if hovering over [.. var variable] shows a nullable type (probably shouldn't?)

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The var will definitely have a ?, because it always does. Theoretically, though, it should say that variable is considered not null here.

break;
}
case BoundDagAssignmentEvaluation e:
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4 changes: 2 additions & 2 deletions src/Compilers/CSharp/Test/Semantic/Semantics/PatternMatchingTestBase.cs
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Expand Up @@ -441,12 +441,12 @@ protected static void AssertEmpty(SymbolInfo info)
Assert.Equal(CandidateReason.None, info.CandidateReason);
}

protected static void VerifyDecisionDagDump<T>(Compilation comp, string expectedDecisionDag)
protected static void VerifyDecisionDagDump<T>(Compilation comp, string expectedDecisionDag, int index = 0)
where T : CSharpSyntaxNode
{
#if DEBUG
var tree = comp.SyntaxTrees.First();
var node = tree.GetRoot().DescendantNodes().OfType<T>().First();
var node = tree.GetRoot().DescendantNodes().OfType<T>().ElementAt(index);
var model = (CSharpSemanticModel)comp.GetSemanticModel(tree);
var binder = model.GetEnclosingBinder(node.SpanStart);
var decisionDag = node switch
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