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CoreCompile is not called from the Build context menu
When loading a .pyproj in Visual Studio that defines a CoreCompile target, the Build, Rebuild and Clean items appear. Selecting the Build item doesn't appear to run the Build target. Instead it appears to run the SourceFilesProjectOutputGroup target, which
doesn't really do anything. Selecting Rebuild does run the ReBuild target, which eventually runs the Build and CoreCompile targets.
This is with PTVS 2.1 RC with Visual Studio 2012 and Tools version 4.0.