Input param postconditions #49576
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Input param postconditions #49576
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jcouv
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New Language Feature - Nullable Reference Types
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@dotnet/roslyn-compiler Please review |
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@dotnet/roslyn-compiler Please review |
cston
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Dec 7, 2020
| @@ -5308,7 +5324,10 @@ private VisitArgumentResult VisitArgumentEvaluate(BoundExpression argument, RefK | |||
| stateForLambda: result.StateForLambda); | |||
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| // If the parameter has annotations, we perform an additional check for nullable value types | |||
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nullable value types [](start = 96, length = 20)
Is this just for nullable value types?
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Yes, for example in the case of a parameter [DisallowNull] string? s we can adjust the type to just string and then visit the conversion. But in the case of [DisallowNull] int? i we can't adjust the type in that way. SharpLab. Note particularly the difference in diagnostic IDs.
cston
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Dec 7, 2020
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The validation run passes CloudBuild so will merge this now. |
ghost
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Closes #48605
Closes #48134
Closes #49136
Implements the change described in dotnet/csharplang#4102 (comment). Also fixes a bug where a null-conditional expression with a type
T where T : class?had flow stateMaybeNullwhen it should actually have flow stateMaybeDefault.Note that while arguments to user-defined conversions have their state updated when the conversion causes a nullable warning, we don't actually honor the postcondition on the conversion parameter. Filed #49575 to follow-up-- I think parameter postconditions on a user-defined conversion are a pretty edge case, so probably won't prioritize it.