patch 8.2.2759: Vim9: for loop infers type of loop variable

Problem:    Vim9: for loop infers type of loop variable.
Solution:   Do not get the member type. (closes #8102)

src/testdir/test_vim9_script.vim

@@ -2295,70 +2295,82 @@ def Test_for_outside_of_function()
 enddef
 
 def Test_for_loop()
-  var result = ''
-  for cnt in range(7)
-    if cnt == 4
-      break
-    endif
-    if cnt == 2
-      continue
-    endif
-    result ..= cnt .. '_'
-  endfor
-  assert_equal('0_1_3_', result)
+  var lines =<< trim END
+      var result = ''
+      for cnt in range(7)
+        if cnt == 4
+          break
+        endif
+        if cnt == 2
+          continue
+        endif
+        result ..= cnt .. '_'
+      endfor
+      assert_equal('0_1_3_', result)
 
-  var concat = ''
-  for str in eval('["one", "two"]')
-    concat ..= str
-  endfor
-  assert_equal('onetwo', concat)
+      var concat = ''
+      for str in eval('["one", "two"]')
+        concat ..= str
+      endfor
+      assert_equal('onetwo', concat)
 
-  var total = 0
-  for nr in
-      [1, 2, 3]
-    total += nr
-  endfor
-  assert_equal(6, total)
+      var total = 0
+      for nr in
+          [1, 2, 3]
+        total += nr
+      endfor
+      assert_equal(6, total)
 
-  total = 0
-  for nr
-    in [1, 2, 3]
-    total += nr
-  endfor
-  assert_equal(6, total)
+      total = 0
+      for nr
+        in [1, 2, 3]
+        total += nr
+      endfor
+      assert_equal(6, total)
 
-  total = 0
-  for nr
-    in
-    [1, 2, 3]
-    total += nr
-  endfor
-  assert_equal(6, total)
+      total = 0
+      for nr
+        in
+        [1, 2, 3]
+        total += nr
+      endfor
+      assert_equal(6, total)
 
+      # loop over string
+      var res = ''
+      for c in 'aéc̀d'
+        res ..= c .. '-'
+      endfor
+      assert_equal('a-é-c̀-d-', res)
+
+      res = ''
+      for c in ''
+        res ..= c .. '-'
+      endfor
+      assert_equal('', res)
+
+      res = ''
+      for c in test_null_string()
+        res ..= c .. '-'
+      endfor
+      assert_equal('', res)
+
+      var foo: list<dict<any>> = [
+              {a: 'Cat'}
+            ]
+      for dd in foo
+        dd.counter = 12
+      endfor
+      assert_equal([{a: 'Cat', counter: 12}], foo)
+  END
+  CheckDefAndScriptSuccess(lines)
+
+  # TODO: should also work at script level
   var res = ""
   for [n: number, s: string] in [[1, 'a'], [2, 'b']]
     res ..= n .. s
   endfor
   assert_equal('1a2b', res)
-
-  # loop over string
-  res = ''
-  for c in 'aéc̀d'
-    res ..= c .. '-'
-  endfor
-  assert_equal('a-é-c̀-d-', res)
-
-  res = ''
-  for c in ''
-    res ..= c .. '-'
-  endfor
-  assert_equal('', res)
-
-  res = ''
-  for c in test_null_string()
-    res ..= c .. '-'
-  endfor
-  assert_equal('', res)
 enddef
 
 def Test_for_loop_fails()
@@ -2471,20 +2483,23 @@ def Test_for_loop_unpack()
 enddef
 
 def Test_for_loop_with_try_continue()
-  var looped = 0
-  var cleanup = 0
-  for i in range(3)
-    looped += 1
-    try
-      eval [][0]
-    catch
-      continue
-    finally
-      cleanup += 1
-    endtry
-  endfor
-  assert_equal(3, looped)
-  assert_equal(3, cleanup)
+  var lines =<< trim END
+      var looped = 0
+      var cleanup = 0
+      for i in range(3)
+        looped += 1
+        try
+          eval [][0]
+        catch
+          continue
+        finally
+          cleanup += 1
+        endtry
+      endfor
+      assert_equal(3, looped)
+      assert_equal(3, cleanup)
+  END
+  CheckDefAndScriptSuccess(lines)
 enddef
 
 def Test_while_loop()