mac-127459:spack gartung$ spack graph --concretize gallery@dev%gcc@4.9.3
...

| | | |/| |||||_|/Traceback (most recent call last):
File "/Users/gartung/spack/bin/spack", line 179, in
main()
File "/Users/gartung/spack/bin/spack", line 157, in main
return_val = command(parser, args)
File "/Users/gartung/spack/lib/spack/spack/cmd/graph.py", line 63, in graph
graph_ascii(specs[0], debug=spack.debug)
File "/Users/gartung/spack/lib/spack/spack/graph.py", line 499, in graph_ascii
graph.write(spec, color=color, out=out)
File "/Users/gartung/spack/lib/spack/spack/graph.py", line 426, in write
self._back_edge_line(prev_ends, b, i, False, 'left-1')
File "/Users/gartung/spack/lib/spack/spack/graph.py", line 303, in _back_edge_line
advance(flen, lambda: [("| ", self._pos)] )
File "/Users/gartung/spack/lib/spack/spack/graph.py", line 280, in advance
self._write_edge(*e)
File "/Users/gartung/spack/lib/spack/spack/graph.py", line 161, in _write_edge
name = self._frontier[index][sub]
IndexError: list index out of range