Commit ea343e83b173fd7c4a9dc9762a6502d788e65313 Parent baf5d11e04dc93ae12127faa727daeb5d0b6a63e Author John MacFarlane <jgm@berkeley.edu> Date Mon, 15 Jun 2015 12:10:00 -0700 is_blank: recognize tab as a blank character.