+set -e
+
+# Ensure the checks always use the same locale
+export LC_ALL=C
+
+readonly maxlinelen=$(for ((i=0; i<81; ++i)); do echo -n .; done)
+
+if [[ "${#maxlinelen}" != 81 ]]; then
+ echo "Internal error: Check for line length is incorrect" >&2
+ exit 1
+fi
+
+# "[...] If the last ARG evaluates to 0, let returns 1; 0 is returned
+# otherwise.", hence ignoring the return value.
+let problems=0 || :