This commit adds support for ksh93 shared-state command
substitutions (syntax: ${ command; }) and mksh's value
substitutions (syntax: ${|command;}) in the sh syntax script.
Also add a syntax test for ksh subshares with dumps included
to make sure it doesn't regress.
fixes: #9514
Signed-off-by: Johnothan King <johnothanking@protonmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
