LINQPad's preview version of roslyn does not support nullable reference types

sdflysha

I have posted a discussion here:
http://forum.linqpad.net/discussion/1723/add-updated-experimental-roslyn-assemblies-to-support-c-8-0 to upgrade to latest roslyn.

Looks like it's not a latest version, it does support Indexes and Ranges, but the nullable reference types seem not working anymore. Please have some check and better upgrade to latest 2.10(Currently preview is 2.9.0.0):
https://github.com/dotnet/roslyn/releases
https://github.com/dotnet/roslyn/releases/tag/version-2.10.0

sdflysha

Hmm, do we have any update for this? Or can I download previous version of LINQPad(say 5.31?)

JoeAlbahari

I've reverted the preview assemblies to the previous state, so nullable reference types will work again.

To support 2.10 will require a new LINQPad build. I'll try and upload something in the next day or two.

JoeAlbahari

I've just downloaded the 2.10 build. Correct me if I'm wrong, but it looks like it supports nullable types, but not other C# 8 experimental features such as ranges and indexes. (I've not tried building directly from the source code - I'd like to avoid this if possible.)

sdflysha

Sounds a plan, thank you
Looks like the current version of Visual Studio 2019 Preview 1.1 is using the roslyn 2.11 preview, it's a not released version.

JoeAlbahari

Try the latest LINQPad beta. When you download the experimental Roslyn assemblies, it should now pick up Roslyn 2.11.

sdflysha

Thanks you, that's really a great news!

sdflysha

It works, and unbelievablely, compiler automatically generate Range.cs/Index.cs in assembly! (I created a nuget package here: https://www.nuget.org/packages/Sdcb.System.Range/)

Is this generated by Roslyn or LINQPad?

JoeAlbahari

It's generated by LINQPad. If those types are not present, it includes the source for them in the query.

elias_poulogiannis

This is strange, using the previous beta I was able to use the new switch expression , when using the preview roslyn assemblies but, since upgrading to the latest beta I can't.