Missing -- separator in grep -A

[Greg Steuck]

The separator doesn't get printed when I use this script on OpenBSD. It
does get printed on FreeBSD or if I used GNU grep. The issue appears to
be an off-by-one of some sort because removing the empty line makes the
separator disappear on both systems.

#!/bin/sh

grep -E -A6 '^(.w)?g' <<'EOF'
$wg
a
b
c
d
e
f

g = \ ds ->
h
i
j
EOF