def FSharpInstallDir(self):
        """
        Microsoft Visual F# directory.

        Return
        ------
        str
            path
        """
        path = join(self.ri.visualstudio, r'%0.1f\Setup\F#' % self.vs_ver)
        return self.ri.lookup(path, 'productdir') or ''

        Microsoft Visual F# directory.

        Return
        ------
        str
            path
        
product/gradle-plugin/src/main/python/setuptools/msvc.py