This is a .NET Standard 1.3 class library project in Visual Studio 2017 RTM. Upgraded to ANTLR latest NuGet package (prerelease), and compilation triggers,
ANTLR cannot generate 'org.antlr.v4.codegen.target.CSharp_v1_3Target' code as of version 4.6.1-SNAPSHOT
I can easily use the workaround mentioned in this blog post, but do hope the tooling can be improved to support .NET Standard profiles as target framework version soon.