busybox/shell/ash_test/ash-psubst/tick_in_heredoc.tests

cat <<END
1
$(echo "")
2
`echo ""`
3
END
ash: expand: Fix trailing newlines processing in backquote expanding Upstream commit: Date: Mon, 29 Apr 2019 19:13:37 +0500 expand: Fix trailing newlines processing in backquote expanding According to POSIX.1-2008 we should remove newlines only at the end of the substitution. Newlines-only substitions causes dash to remove newlines before beggining of the substitution. The following code: cat <<END 1 $(echo "") 2 END prints "1<newline>2" instead of expected "1<newline><newline>2". This patch fixes trailing newlines processing in backquote expanding. Signed-off-by: Nikolai Merinov <n.merinov@inango-systems.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> 2020-02-17 14:54:32 +05:30			`cat <<END`
			`1`
			`$(echo "")`
			`2`
			`echo ""`
			`3`
			`END`