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Area-NullnessIssues related to handling of Nullable Reference TypesIssues related to handling of Nullable Reference TypesBugImpact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.
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Description
Issue description
ToString
on a record or union returns string | null
. The method body is generated by the compiler and the result is known to be not null.
Choose one or more from the following categories of impact
- Unexpected nullness warning (false positive in nullness checking, code uses --checknulls and langversion:preview).
- Missing nullness warning in a case which can produce nulls (false negative, code uses --checknulls and langversion:preview).
- Breaking change related to older
null
constructs in code not using the checknulls switch. - Breaking change related to generic code and explicit type constraints (
null
,not null
). - Type inference issue (i.e. code worked without type annotations before, and applying the --checknulls enforces type annotations).
- C#/F# interop issue related to nullness metadata.
- Other (none of the categories above apply).
Operating System
Windows (Default)
What .NET runtime/SDK kind are you seeing the issue on
.NET SDK (.NET Core, .NET 5+)
.NET Runtime/SDK version
9.0.0-preview.7.24405.7
Reproducible code snippet and actual behavior
type X = A | B
let x: string = A.ToString ()
Possible workarounds
No response
T-Gro and auduchinok
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Area-NullnessIssues related to handling of Nullable Reference TypesIssues related to handling of Nullable Reference TypesBugImpact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.
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