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On Sep 17, 2018, at 12:36 AM, Sean Conner <sean@conman.org> wrote:

1) it is handled by the routine itself
  a) no check is performed at all [5]
  b) the error condition is noticed but ignored

1c) The error condition is corrected by the routine itself.

For example, open a file at location A, fail, try location B, succeed.

—Tim