Lack of CS0165 (Use of unassigned local variable) for DateOnly and TimeOnly types

[Wojmik]

Version Used:
.Net 6. Visual Studio 17.3.6.

Steps to Reproduce:

DateOnly date;
TimeOnly time;

Console.WriteLine(date);//Lack of CS0165 - unassigned local variable
Console.WriteLine(time);//Same here

Expected Behavior:
You should have CS0165 error (Use of unassigned local variable).
If you change a type to e.g. DateTime, the error appears like it should.

Actual Behavior:
No error, you can compile and run it.

[RikkiGibson]

I'm seeing that the ref assembly containing DateOnly does not contain any fields. Therefore the compiler considers it to be "vacuously" assigned--after all, all zero of the fields in it are assigned.

Rerouting issue to runtime repo.

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[ghost]

Tagging subscribers to this area: @dotnet/area-infrastructure-libraries
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Version Used:
.Net 6. Visual Studio 17.3.6.

Steps to Reproduce:

DateOnly date;
TimeOnly time;

Console.WriteLine(date);//Lack of CS0165 - unassigned local variable
Console.WriteLine(time);//Same here

Expected Behavior:
You should have CS0165 error (Use of unassigned local variable).
If you change a type to e.g. DateTime, the error appears like it should.

Actual Behavior:
No error, you can compile and run it.

Author:	Wojmik
Assignees:	-
Labels:	area-Infrastructure-libraries, untriaged
Milestone:	-

[ghost]

Tagging subscribers to this area: @dotnet/area-system-runtime
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Version Used:
.Net 6. Visual Studio 17.3.6.

Steps to Reproduce:

DateOnly date;
TimeOnly time;

Console.WriteLine(date);//Lack of CS0165 - unassigned local variable
Console.WriteLine(time);//Same here

Expected Behavior:
You should have CS0165 error (Use of unassigned local variable).
If you change a type to e.g. DateTime, the error appears like it should.

Actual Behavior:
No error, you can compile and run it.

Author:	Wojmik
Assignees:	-
Labels:	area-System.Runtime, untriaged
Milestone:	-

[ViktorHofer]

Changing label to System.Runtime as this is about System.Runtime's reference assembly.

[dakersnar]

cc @tarekgh as this is DateTime related

[tarekgh]

This is fixed in .NET 7.0. Please try it and let's know if you still see the problem there. Thanks for your report.