See bug #582966
5decd48 dev-python/pypy3-bin: INSDESTTREE -> custom var, #582982 21297d3 dev-python/pypy-bin: INSDESTTREE -> custom var, #582982 ca95145 dev-python/pypy3: INSDESTTREE -> custom var, #582982 1f2cdfa dev-python/pypy: INSDESTTREE -> custom var, #582982