patch 9.0.0460: loop variable can't be found

Problem:    Loop variable can't be found.
Solution:   Adjust block_id of the loop variable each round.
diff --git a/src/testdir/dumps/Test_vim9_closure_fails.dump b/src/testdir/dumps/Test_vim9_closure_fails.dump
index 1189a3a..dd0103c 100644
--- a/src/testdir/dumps/Test_vim9_closure_fails.dump
+++ b/src/testdir/dumps/Test_vim9_closure_fails.dump
@@ -1,6 +1,6 @@
-|~+0#4040ff13#ffffff0| @73
+> +0&#ffffff0@74
+|~+0#4040ff13&| @73
 |~| @73
-|E+0#ffffff16#e000002|r@1|o|r| |d|e|t|e|c|t|e|d| |w|h|i|l|e| |p|r|o|c|e|s@1|i|n|g| |f|u|n|c|t|i|o|n| |<|l|a|m|b|d|a|>|1|:| +0#0000000#ffffff0@23
-|l+0#af5f00255&|i|n|e| @3|1|:| +0#0000000&@64
-|E+0#ffffff16#e000002|1|3|0|2|:| |S|c|r|i|p|t| |v|a|r|i|a|b|l|e| |w|a|s| |d|e|l|e|t|e|d| +0#0000000#ffffff0@40
-|P+0#00e0003&|r|e|s@1| |E|N|T|E|R| |o|r| |t|y|p|e| |c|o|m@1|a|n|d| |t|o| |c|o|n|t|i|n|u|e> +0#0000000&@35
+|~| @73
+|~| @73
+|0+0#0000000&| @55|0|,|0|-|1| @8|A|l@1| 
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index a1c58a2..4a5546b 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -2930,8 +2930,10 @@
 def Run_Test_closure_in_for_loop_fails()
   var lines =<< trim END
     vim9script
+    redraw
     for n in [0]
-        timer_start(10, (_) => {
+        # time should be enough for startup to finish
+        timer_start(200, (_) => {
             echo n
         })
     endfor
@@ -2940,7 +2942,7 @@
 
   # Check that an error shows
   var buf = g:RunVimInTerminal('-S XTest_closure_fails', {rows: 6, wait_for_ruler: 0})
-  g:VerifyScreenDump(buf, 'Test_vim9_closure_fails', {})
+  g:VerifyScreenDump(buf, 'Test_vim9_closure_fails', {wait: 3000})
 
   # clean up
   g:StopVimInTerminal(buf)
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index fa9bb0c..0f462e3 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -2259,9 +2259,23 @@
 enddef
 
 def Test_for_loop_with_closure()
+  # using the loop variable in a closure results in the last used value
   var lines =<< trim END
       var flist: list<func>
       for i in range(5)
+        flist[i] = () => i
+      endfor
+      for i in range(5)
+        assert_equal(4, flist[i]())
+      endfor
+  END
+  v9.CheckDefAndScriptSuccess(lines)
+
+  # using a local variable set to the loop variable in a closure results in the
+  # value at that moment
+  lines =<< trim END
+      var flist: list<func>
+      for i in range(5)
         var inloop = i
         flist[i] = () => inloop
       endfor