Microsoft.NETCore.App type: platform can be restored but not built for netcore50 projects

Steps to reproduce

• Create a project with the project.json:

{
  "dependencies": {
    "Microsoft.NETCore.App": {
      "type": "platform",
      "version": "1.0.0-*"
    }
  },
  "frameworks": {
    "netcore50": {
    }
  }
}

• Add a class

public class Anything
{
}

• Run dotnet restore (completes successfully, but shouldn’t).
• Run dotnet build

Expected behavior

Restore should have failed with

Package System.Runtime.Loader 4.0.0-rc2-24027 is not compatible with netcore50 (.NETCore,Version=v5.0). Package System.Runtime.Loader 4.0.0-rc2-24027 supports:
      - net462 (.NETFramework,Version=v4.6.2)
      - netstandard1.5 (.NETStandard,Version=v1.5)
    One or more packages are incompatible with .NETCore,Version=v5.0.

Actual behavior

Restore succeeds and build fails with: error NU1002: The dependency System.Runtime.Loader 4.0.0-rc2-24027 does not support framework .NETCore,Version=v5.0.

Environment data

.NET Command Line Tools (1.0.0-rc2-002678)

Product Information:                      
 Version:     1.0.0-rc2-002678            
 Commit Sha:  3b2ea9d14b                  

Runtime Environment:                      
 OS Name:     Windows                     
 OS Version:  10.0.10586                  
 OS Platform: Windows                     
 RID:         win10-x64 

Extra

If you remove "type": "platform" from Microsoft.NETCore.App restore fails as expected.

/cc @Eilon @pranavkm @pakrym

[ericstj]

I believe @weshaggard fixed this as of https://github.com/dotnet/core-setup/commit/42b00aa3b269f598853d1e3cdfbf20e66429d7d1

[weshaggard]

Yes this has been fixed.