sh: Allow terminating a heredoc with a terminator at EOF without a newline.

This is sometimes used with eval or old-style command substitution, and most
shells other than ash derivatives allow it.

It can also be used with scripts that violate POSIX's requirement on the
application that they end in a newline (scripts must be text files except
that line length is unlimited).

Example:
v=`cat <<EOF
foo
EOF`
echo $v

This commit does not add support for the similar construct with new-style
command substitution, like
v=$(cat <<EOF
foo
EOF)
This continues to require a newline after the terminator.

1 files changed, 26 insertions, 0 deletions

diff --git a/tools/regression/bin/sh/parser/heredoc11.0 b/tools/regression/bin/sh/parser/heredoc11.0
new file mode 100644
index 0000000..5839e46
--- /dev/null
+++ b/tools/regression/bin/sh/parser/heredoc11.0
@@ -0,0 +1,26 @@
+# $FreeBSD$
+
+failures=''
+
+check() {
+	if eval "[ $* ]"; then
+		:
+	else
+		echo "Failed: $*"
+		failures=x$failures
+	fi
+}
+
+check '`cat <<EOF
+foo
+EOF` = foo'
+
+check '"`cat <<EOF
+foo
+EOF`" = foo'
+
+check '`eval "cat <<EOF
+foo
+EOF"` = foo'
+
+test "x$failures" = x