import sys, curses, curses.panel

def main(scrn):
    panel = curses.panel.new_panel(scrn)
    obj = object()
    nrefs = sys.getrefcount(obj)
    for i in range(100):
        panel.set_userptr(obj)

    panel.set_userptr(None)
    assert sys.getrefcount(obj) == nrefs

if __name__ == '__main__':
    curses.wrapper(main)