remove unreachable states, assert they are unreachable just in case#19180

Merged

jreback merged 2 commits intopandas-dev:masterfrom

jbrockmendel:internalize

Jan 12, 2018

Commits on Jan 11, 2018

remove unreachable states, assert they are unreachable just in case
jbrockmendel
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Merge branch 'master' of https://github.com/pandas-dev/pandas into internalize
jbrockmendel
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