[文件操作] 批处理setlocal为何提示达到最大递归层？

@echo off&setlocal enableDelayedExpansion
cd/d "D:\Source"
for /d %%a in (*) do (
        set "a=%%a"
    for /d %%b in ("D:\Test\!a:~0,2!\!a:~2,2!\!a!") do (
    set "b=%%b"
    xcopy /c/q/i/s/e/k/r/h/y "%%b" "D:\Backup\%date:~0,10%%d%\!a!")
        xcopy /c/q/i/s/e/k/r/h/y "%%a" "D:\Test\!a:~0,2!\!a:~2,2!\!a!"
)
pause

@echo off&setlocal enableDelayedExpansion
cd/d "D:\Source1"
for /d %%a in (*) do (
        set "a=%%a"
    for /d %%b in ("D:\Test\!a:~0,2!\!a:~2,2!\!a!") do (
    set "b=%%b"
    xcopy /c/q/i/s/e/k/r/h/y "%%b" "D:\Backup\%date:~0,10%%d%\!a!")
        xcopy /c/q/i/s/e/k/r/h/y "%%a" "D:\Test\!a:~0,2!\!a:~2,2!\!a!"
)
pause
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