numpy/numpy — pull request #440 by matthew-brett (2012-09-13 10:30:31+00:00)
Title: BUG: allow any axis for np.concatenate for 1D

Previous numpies allowed the user to pass any integer as axis argument
to np.concatenate, when the input arrays were 1D. At some point we
tightened up on this, raising an error for axis values other than 0.
This raises a FutureWarning for axis numbers != 0, but allows them, for
backwards compatibility.