BUG: non unique indexing via loc broken #3659
Description
This throws a weird error
df = DataFrame({'A' : [1,2,3,4], 'B' : [3, 4, 5, 6]}, index = [0,1,0,1])
df.loc[1:]
https://groups.google.com/forum/?fromgroups#!topic/pydata/zTm2No0crYs
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