How to use C# 7 with Visual Studio 2015?

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You can replace the compiler shipped with Visual Studio for a C# 7-enabled version by installing the Nuget package Microsoft.Net.Compilers:

Referencing this package will cause the project to be built using the
specific version of the C# and Visual Basic compilers contained in the
package, as opposed to any system installed version.

There is no indication that I can see on the package page as to whether this is officially supported in Visual Studio 2015. My not-thorough tests so far indicate that it works but not painlessly – C# 7 code compiles, but is underlined with the red squiggly line which indicates a syntax error:
ScreenshotNote that you will also need to install the Nuget package System.ValueTuple to use the new C# 7 value tuples features.

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