If Length and Count are both present, only the former is assumed to be non-negative #57268
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ghost
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alrz
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Oct 20, 2021
| @@ -1458,7 +1458,8 @@ void addSubpatternsForTuple(ImmutableArray<TypeWithAnnotations> elementTypes) | |||
| { | |||
| isLengthOrCount = receiverType.IsSZArray() | |||
| ? ReferenceEquals(memberSymbol, Compilation.GetSpecialTypeMember(SpecialMember.System_Array__Length)) | |||
| : TryPerformPatternIndexerLookup(node, receiverType, argIsIndex: true, indexerAccess: out _, patternSymbol: out _, lengthProperty: out _, BindingDiagnosticBag.Discarded); | |||
| : TryPerformPatternIndexerLookup(node, receiverType, argIsIndex: true, indexerAccess: out _, patternSymbol: out _, out PropertySymbol? lengthProperty, BindingDiagnosticBag.Discarded) && | |||
| memberSymbol.Equals(lengthProperty, TypeCompareKind.ConsiderEverything); // If Length and Count are both present, only the former is assumed to be non-negative. | |||
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📝 Linking to #53891 (comment) if more investigation is needed.
333fred
approved these changes
Oct 21, 2021
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Closes dotnet/csharplang#5137
Relates to test plan #51289