# new tests
x=4
sp=' '

# word
recho ${x}${sp}''

# unquoted
recho ${x+ab "$y"}
recho ${x+ab ''}
recho ${x+ab "$( : )"}
recho ${x+ab "${yy}"}

# quoted
recho "${x+ab ''}"
recho "${x+ab ""}"
recho "${x+ab '${yy}'}"
recho "${x+ab "${yy}"}"