Revert "Fix false positive for undefined-loop-variable for lambda i…

…n first of two loops (#6479)"

This reverts commit 9d30042.

ChangeLog

@@ -242,11 +242,6 @@ What's New in Pylint 2.13.8?
 ============================
 Release date: TBA
 
-* Fix a false positive for ``undefined-loop-variable`` for a variable used in a lambda
-  inside the first of multiple loops.
-
-  Closes #6419
-
 * Fix a crash when linting a file that passes an integer ``mode=`` to
   ``open``
 

doc/whatsnew/2.13.rst

@@ -625,11 +625,6 @@ Other Changes
 
   Closes #5930
 
-* Fix a false positive for ``undefined-loop-variable`` for a variable used in a lambda
-  inside the first of multiple loops.
-
-  Closes #6419
-
 * Fix a crash when linting a file that passes an integer ``mode=`` to
   ``open``
 

pylint/checkers/variables.py

@@ -2198,10 +2198,7 @@ def _loopvar_name(self, node: astroid.Name) -> None:
         # the usage is safe because the function will not be defined either if
         # the variable is not defined.
         scope = node.scope()
-        # FunctionDef subclasses Lambda due to a curious ontology. Check both.
-        # See https://github.com/PyCQA/astroid/issues/291
-        # TODO: Revisit when astroid 3.0 includes the change
-        if isinstance(scope, nodes.Lambda) and any(
+        if isinstance(scope, nodes.FunctionDef) and any(
             asmt.scope().parent_of(scope) for asmt in astmts
         ):
             return

tests/functional/u/undefined/undefined_loop_variable.py

@@ -119,23 +119,3 @@ def for_else_raises(iterable):
     ]
     for item in lst
 ]
-
-
-def lambda_in_first_of_two_loops():
-    """https://github.com/PyCQA/pylint/issues/6419"""
-    my_list = []
-    for thing in my_list:
-        print_it = lambda: print(thing)  # pylint: disable=cell-var-from-loop
-        print_it()
-
-    for thing in my_list:
-        print(thing)
-
-
-def variable_name_assigned_in_body_of_second_loop():
-    for alias in tuple(bigger):
-        continue
-    for _ in range(3):
-        alias = True
-        if alias:
-            print(alias)