VB version confusion

[Youssef1313]

The article mentions Visual Basic 15.8, which I can't find in Roslyn source code. They define a LanguageVersion enum

https://github.com/dotnet/roslyn/blob/e704ca635bd6de70a0250e34c4567c7a28fa9f6d/src/Compilers/VisualBasic/Portable/LanguageVersion.vb#L12

with the following members:

    Public Enum LanguageVersion
        [Default] = 0
        VisualBasic9 = 9
        VisualBasic10 = 10
        VisualBasic11 = 11
        VisualBasic12 = 12
        VisualBasic14 = 14
        VisualBasic15 = 15
        VisualBasic15_3 = 1503
        VisualBasic15_5 = 1505
        VisualBasic16 = 1600

        Latest = Integer.MaxValue
    End Enum

I think that the mentioned improvement for VB 15.8 is actually done for Roslyn that shipped with VS 15.8, and that wasn't under a new language version. This also may mean that a previous PR of mine (#12884) could be wrong and should be reverted. I must have added that lang version based on what I've seen in this what's new article.

I also think Visual Basic 2017 should be Visual Basic 15.0 (that was the version shipped with Visual Studio 2017)

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Document Details

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• ID: 272fdffd-2201-990f-387b-d37467e976cf
• Version Independent ID: 06703ef5-e10a-3fdd-da13-0ce99903a5e6
• Content: What's new for Visual Basic - Visual Basic
• Content Source: docs/visual-basic/getting-started/whats-new.md
• Product: dotnet-visualbasic
• GitHub Login: @KathleenDollard
• Microsoft Alias: kdollard

[BillWagner]

ping @KathleenDollard for a recommended resolution

[Youssef1313]

@BillWagner, I've updated the issue with another possible issue too.

Could we ask for help here from the compiler team too?

[adegeo]

Sent email to @KathleenDollard

[cston]

I think that the mentioned improvement for VB 15.8 is actually done for Roslyn that shipped with VS 15.8, and that wasn't under a new language version.

The Optimized floating-point to integer conversion change appears to have been made in Visual Studio 15.8 to address dotnet/roslyn#26907. The language version was unchanged at 15.5.

Since the change was made between language versions 15.5 and 16.0, perhaps the change should be associated with language version 16.0.