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diff --git a/bin/cash/tests/builtins/trap17.0 b/bin/cash/tests/builtins/trap17.0
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+# $FreeBSD: releng/12.0/bin/sh/tests/builtins/trap17.0 297360 2016-03-28 18:58:40Z jilles $
+# This use-after-free bug probably needs non-default settings to show up.
+
+v1=nothing v2=nothing
+trap 'trap "echo bad" USR1
+v1=trap_received
+v2=trap_invoked
+:' USR1
+kill -USR1 "$$"
+[ "$v1.$v2" = trap_received.trap_invoked ]