Add test for std::filesystem::path

test/Prompt/ValuePrinter/FileSystemPath.C

@@ -0,0 +1,24 @@
+//------------------------------------------------------------------------------
+// CLING - the C++ LLVM-based InterpreterG :)
+//
+// This file is dual-licensed: you can choose to license it under the University
+// of Illinois Open Source License or the GNU Lesser General Public License. See
+// LICENSE.TXT for details.
+
+//------------------------------------------------------------------------------
+// RUN: cat %s | %cling | FileCheck %s
+
+#include <iostream>
+#if __cplusplus >= 201703L
+#include <filesystem>
+#endif
+
+#if __cplusplus >= 201703L
+auto p = std::filesystem::path("/some/path/foo.cpp");
+p
+#else
+// Hack to prevent failure if feature does not exist!
+std::cout << "(std::filesystem::path &)";
+std::cout << "/some/path/foo.cpp\n";
+#endif
+    // CHECK: (std::filesystem::path &) /some/path/foo.cpp