用循环批量修改变量名，报错请问如何解决？谢谢
foreach v of var _all {
2. local i =`i'+1
3. local l = v2 in `i'
4. local k = v3 in `i'
5. rename `v' `l'
6. label var `l' "`k'"
7.}
syntax error
Syntax is
renameoldname newname [, renumber[(#)] addnumber[(#)] sort ...]
rename (oldnames) (newnames) [, renumber[(#)] addnumber[(#)] sort ...]
renameoldnames , {upper|lower|proper}
r(198);