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diff --git a/bin/1sh/tests/parser/dollar-quote12.0 b/bin/1sh/tests/parser/dollar-quote12.0
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+# $FreeBSD: releng/12.1/bin/sh/tests/parser/dollar-quote12.0 286971 2015-08-20 21:31:36Z jilles $
+
+# \u without any digits at all remains invalid.
+# Our choice is a parse error.
+
+v=$( (eval ": \$'\u'") 2>&1 >/dev/null)
+[ $? -ne 0 ] && [ -n "$v" ]