C#•3y ago

dotnet6 project failing on static abstracts with preview features set to true

C:\Users\Kellen James\source\Repos\ClemBot\ClemBot.Api\ClemBot.Api.Core\Features\Tags\Edit.cs(51,49): error CS8920: The
 interface 'IQueryResult<Edit.TagDto>' cannot be used as type argument. Static member 'IQueryResult<Edit.TagDto>.Succes
s(Edit.TagDto?)' does not have a most specific implementation in the interface. [C:\Users\Kellen James\source\Repos\Cle
mBot\ClemBot.Api\ClemBot.Api.Core\ClemBot.Api.Core.csproj]
C:\Users\Kellen James\source\Repos\ClemBot\ClemBot.Api\ClemBot.Api.Core\Features\Tags\SetCustomTagPrefix.cs(31,48): err
or CS8920: The interface 'IQueryResult<ulong>' cannot be used as type argument. Static member 'IQueryResult<ulong>.Succ
ess(ulong)' does not have a most specific implementation in the interface. [C:\Users\Kellen James\source\Repos\ClemBot\
ClemBot.Api\ClemBot.Api.Core\ClemBot.Api.Core.csproj]
    4 Warning(s)
    261 Error(s)

C:\Users\Kellen James\source\Repos\ClemBot\ClemBot.Api\ClemBot.Api.Core\Features\Tags\Edit.cs(51,49): error CS8920: The
 interface 'IQueryResult<Edit.TagDto>' cannot be used as type argument. Static member 'IQueryResult<Edit.TagDto>.Succes
s(Edit.TagDto?)' does not have a most specific implementation in the interface. [C:\Users\Kellen James\source\Repos\Cle
mBot\ClemBot.Api\ClemBot.Api.Core\ClemBot.Api.Core.csproj]
C:\Users\Kellen James\source\Repos\ClemBot\ClemBot.Api\ClemBot.Api.Core\Features\Tags\SetCustomTagPrefix.cs(31,48): err
or CS8920: The interface 'IQueryResult<ulong>' cannot be used as type argument. Static member 'IQueryResult<ulong>.Succ
ess(ulong)' does not have a most specific implementation in the interface. [C:\Users\Kellen James\source\Repos\ClemBot\
ClemBot.Api\ClemBot.Api.Core\ClemBot.Api.Core.csproj]
    4 Warning(s)
    261 Error(s)

I am seeing this error attempting to use static abstracts in a .net 6 project

12 Replies

JayyOP•3y ago

this code works on other peoples machines fine, its on a 6.0.400 install of dotnet cc @tannergooding maybe? Static abstracts are sorta your wheel house

    <PropertyGroup>
        <TargetFramework>net6.0</TargetFramework>
        <Nullable>enable</Nullable>
        <WarningsAsErrors>nullable</WarningsAsErrors>
        <LangVersion>preview</LangVersion>
        <EnablePreviewFeatures>True</EnablePreviewFeatures>
    </PropertyGroup>

    <PropertyGroup>
        <TargetFramework>net6.0</TargetFramework>
        <Nullable>enable</Nullable>
        <WarningsAsErrors>nullable</WarningsAsErrors>
        <LangVersion>preview</LangVersion>
        <EnablePreviewFeatures>True</EnablePreviewFeatures>
    </PropertyGroup>

csproj

tannergooding•3y ago

.net 6 has many limitations as not all runtime support is ghere Also going camping until Wednesday, so little internet

JayyOP•3y ago

ahh ok, have fun ohh wow ok, so i upgraded my sdk from 6.0.1 -> 6.0.4 and it started failing for me fascinating this feels like a bug

333fred•3y ago

Show code, but likely not a bug

333fred•3y ago

See https://github.com/dotnet/csharplang/issues/5955

GitHub

Disallow interfaces with static virtual members as type arguments ·...

This proposal attempts to address a type hole that has been pointed out a number of times with static virtual members, e.g. here. Static virtual members (Proposal: static-abstracts-in-interfaces.md...

JayyOP•3y ago

did this ship 5 days ago as part of 6.0.8 of the runtime?

333fred•3y ago

Wouldn't surprise me

JayyOP•3y ago

thats fantastic lol -_- and code is this

public interface IQueryResult<T> : IResult<T, QueryStatus>
{
    static abstract IQueryResult<T> Success(T? val);
    static abstract IQueryResult<T> Invalid(T? val);
    static abstract IQueryResult<T> NotFound();
    static abstract IQueryResult<T> Conflict();
    static abstract IQueryResult<T> Forbidden();
}

public interface IQueryResult<T> : IResult<T, QueryStatus>
{
    static abstract IQueryResult<T> Success(T? val);
    static abstract IQueryResult<T> Invalid(T? val);
    static abstract IQueryResult<T> NotFound();
    static abstract IQueryResult<T> Conflict();
    static abstract IQueryResult<T> Forbidden();
}

Patrick•3y ago

for a moment i thought you had lied to us all about your name

JayyOP•3y ago

    public class Handler(ClemBotContext _context) : IRequestHandler<Command, IQueryResult<Model>>
    {
    }

    public class Handler(ClemBotContext _context) : IRequestHandler<Command, IQueryResult<Model>>
    {
    }

JayyOP•3y ago

JayyOP•3y ago

this is quite unfortunate i am going to have to rewrite... everything for this and i cant write a conversion cuz its an interface ree

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dotnet6 project failing on static abstracts with preview features set to true