Cake running on Mono can't load netstandard 2.0 assembly

[bjorkstromm]

Currently getting You must add a reference to assembly 'netstandard, Version=2.0.0.0

Minimal repro:

#addin nuget:?package=Microsoft.AspNetCore.TestHost&version=2.0.0&loaddependencies=true
#addin nuget:?package=Microsoft.AspNetCore.Http.Extensions&version=2.0.0&loaddependencies=true

using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Configuration;

Information("Oh hi, Mark!");

new ConfigurationBuilder().Build();

Gives:

standard.cake(9,28): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.

[dazinator]

I am hitting what I beleive is this same issue at the moment, after updating cake to 0.26.1 which I had hoped might fix it: https://travis-ci.org/GitTools/GitVersion/jobs/362700883#L1944

[devlead]

Which version of mono is used? .NET Standard support was introduced first as preview in like 5.2 and stable in 5.4.

[dazinator]

In the travis.yml file is:

mono: latest

Should I specify something else?

[dazinator]

Will try specifying 5.4.0.201

[dazinator]

Travis doesn't seem to recognise 5.4.0.201 as a valid version of mono.. Have moved thos to a stack overflow question: https://stackoverflow.com/questions/49677894/travis-ci-mono-5-4-0-201

[devlead]

@dazinator I've submitted a suggestion on your Stackoverflow question.