[Backport maintenance/2.17.x] Fix crash from unexpected assignment (#8839)

doc/whatsnew/fragments/8754.bugfix

@@ -0,0 +1,3 @@
+Fix crash when a variable is assigned to a class attribute of identical name.
+
+Closes #8754

pylint/checkers/variables.py

@@ -640,7 +640,9 @@ def get_next_to_consume(self, node: nodes.Name) -> list[nodes.NodeNG] | None:
             and parent_node == found_nodes[0].parent
         ):
             lhs = found_nodes[0].parent.targets[0]
-            if lhs.name == name:  # this name is defined in this very statement
+            if (
+                isinstance(lhs, nodes.AssignName) and lhs.name == name
+            ):  # this name is defined in this very statement
                 found_nodes = None
 
         if (

tests/functional/u/used/used_before_assignment.py

@@ -116,3 +116,8 @@ def turn_on2(**kwargs):
         var, *args = (1, "restore_dimmer_state")
 
     print(var, *args)
+
+attr = 'test'  # pylint: disable=invalid-name
+class T:  # pylint: disable=invalid-name, too-few-public-methods, undefined-variable
+    '''Issue #8754, no crash from unexpected assignment between attribute and variable'''
+    T.attr = attr