PreRelase versions cause warnings (and failed builds when treated as errors)

[Dustin Moris Gorski]

Steps to reproduce:

dotnet new --type=lib --lang=fsharp
dotnet restore
dotnet build

After that I change in the default project.json file the version from 1.0.0-* to 1.0.0-alpha-* and run dotnet build again:

Project New folder (.NETStandard,Version=v1.6) will be compiled because expected outputs are missing
Compiling New folder for .NETStandard,Version=v1.6
C:\GitHub\New folder\warning FS2003: An System.Reflection.AssemblyInformationalVersionAttribute specified version '1.0.0-alpha', but this value is invalid and has been ignored

Compilation succeeded.
    1 Warning(s)
    0 Error(s)

Time elapsed 00:00:04.8871572

.NET Core version

C:\GitHub\New folder>dotnet --version
1.0.0-preview2-003156

The warning is wrong, because 1.0.0-alpha-* should be a valid version, right?

[Enrico Sada]

closing as project.json based is deprecated in favore of 1.0 sdk (msbuild based)

this is fixed in msbuild based 1.0.x sdk