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+#
+# bats-support - Supporting library for Bats test helpers
+#
+# Written in 2016 by Zoltan Tombol <zoltan dot tombol at gmail dot com>
+#
+# To the extent possible under law, the author(s) have dedicated all
+# copyright and related and neighboring rights to this software to the
+# public domain worldwide. This software is distributed without any
+# warranty.
+#
+# You should have received a copy of the CC0 Public Domain Dedication
+# along with this software. If not, see
+# <http://creativecommons.org/publicdomain/zero/1.0/>.
+#
+
+#
+# error.bash
+# ----------
+#
+# Functions implementing error reporting. Used by public helper
+# functions or test suits directly.
+#
+
+# Fail and display a message. When no parameters are specified, the
+# message is read from the standard input. Other functions use this to
+# report failure.
+#
+# Globals:
+#   none
+# Arguments:
+#   $@ - [=STDIN] message
+# Returns:
+#   1 - always
+# Inputs:
+#   STDIN - [=$@] message
+# Outputs:
+#   STDERR - message
+fail() {
+  (( $# == 0 )) && batslib_err || batslib_err "$@"
+  return 1
+}