sh: Add testcase that $? is preserved into a simple command substitution.

The test builtins/trap6.0 already uses this but having it separate eases
diagnosis if this would break.

1 files changed, 5 insertions, 0 deletions

diff --git a/tools/regression/bin/sh/expansion/cmdsubst16.0 b/tools/regression/bin/sh/expansion/cmdsubst16.0
new file mode 100644
index 0000000..71df562
--- /dev/null
+++ b/tools/regression/bin/sh/expansion/cmdsubst16.0
@@ -0,0 +1,5 @@
+# $FreeBSD$
+
+f() { return 3; }
+f
+[ `echo $?` = 3 ]