Windows:

.../jdk/test/hotspot/gtest/utilities/test_lockFreeStack.cpp(54): error C2921: redefinition: 'Stack': class template is being redeclared as 'typedef LockFreeStackTestElement::Stack Stack'
...\jdk\src\hotspot\share\utilities/stack.hpp(93): note: see declaration of 'Stack'

It seems the typedef in the test clashes with actual Stack. We can trivially rename the typedef-ed name to resolve this conflict.