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I spent the better part of Monday chest deep in the debugger trying to figure out why PAM was seg faulting on one server, but not on another. Was it a difference between RedHat ES and Gentoo? Perhaps a subtle difference in PAM versions? Thank vim for :se invlist. Thus, it was revealed:

There are two lessons to be learned. First, the obvious, vim is awesome. Two, PAM ought to be more tolerant of tabs. Extra credit :se expandtab. In actuality, the real lesson is Occam’s Razor.