patch 9.0.0502: a closure in a nested loop in a :def function does not work

Problem:    A closure in a nested loop in a :def function does not work.
Solution:   Use an array of loopvars, one per loop level.
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index d4a520f..a59b55d 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -1023,15 +1023,15 @@
 
         'endif\_s*' ..
         'g:Ref = () => ii\_s*' ..
-        '\d\+ FUNCREF <lambda>4 var $3 - $3\_s*' ..
+        '\d\+ FUNCREF <lambda>4 vars  $3-$3\_s*' ..
         '\d\+ STOREG g:Ref\_s*' ..
 
         'continue\_s*' ..
-        '\d\+ ENDLOOP $1 save $3 - $3\_s*' ..
+        '\d\+ ENDLOOP ref $1 save $3-$3 depth 0\_s*' ..
         '\d\+ JUMP -> \d\+\_s*' ..
 
         'break\_s*' ..
-        '\d\+ ENDLOOP $1 save $3 - $3\_s*' ..
+        '\d\+ ENDLOOP ref $1 save $3-$3 depth 0\_s*' ..
         '\d\+ JUMP -> \d\+\_s*' ..
 
          'if g:val\_s*' ..
@@ -1041,12 +1041,12 @@
 
         '  return\_s*' ..
         '\d\+ PUSHNR 0\_s*' ..
-        '\d\+ ENDLOOP $1 save $3 - $3\_s*' ..
+        '\d\+ ENDLOOP ref $1 save $3-$3 depth 0\_s*' ..
         '\d\+ RETURN\_s*' ..
 
         'endif\_s*' ..
         'endfor\_s*' ..
-        '\d\+ ENDLOOP $1 save $3 - $3\_s*' ..
+        '\d\+ ENDLOOP ref $1 save $3-$3 depth 0\_s*' ..
         '\d\+ JUMP -> \d\+\_s*' ..
         '\d\+ DROP\_s*' ..
         '\d\+ RETURN void',