Remove unused NameExpr.info property

It seems like the `info` attribute inside NameExpr is not actually set
or used anywhere. This commit removes it altogether.

Author: MichaelLeeDBX

mypy/checkexpr.py

@@ -57,14 +57,12 @@ def extract_refexpr_names(expr: RefExpr) -> Set[str]:
             output.add(expr.fullname)
 
         if isinstance(expr, NameExpr):
-            is_silenced_import = isinstance(expr.node, Var) and expr.node.is_import
-            if expr.info is not None:
-                # Reference to regular type
-                output.update(split_module_names(expr.info.module_name))
-            elif isinstance(expr.node, TypeInfo):
-                # Nested class
+            is_suppressed_import = isinstance(expr.node, Var) and expr.node.is_suppressed_import
+            if isinstance(expr.node, TypeInfo):
+                # Reference to a class or a nested class
                 output.update(split_module_names(expr.node.module_name))
-            elif expr.fullname is not None and '.' in expr.fullname and not is_silenced_import:
+            elif expr.fullname is not None and '.' in expr.fullname and not is_suppressed_import:
+                # Everything else (that is not a silenced import within a class)
                 output.add(expr.fullname.rsplit('.', 1)[0])
             break
         elif isinstance(expr, MemberExpr):

mypy/nodes.py

@@ -1108,8 +1108,6 @@ class NameExpr(RefExpr):
     """
 
     name = None  # type: str      # Name referred to (may be qualified)
-    # TypeInfo of class surrounding expression (may be None)
-    info = None  # type: TypeInfo
 
     literal = LITERAL_TYPE
 

mypy/treetransform.py

@@ -340,7 +340,6 @@ def duplicate_name(self, node: NameExpr) -> NameExpr:
         # This method is used when the transform result must be a NameExpr.
         # visit_name_expr() is used when there is no such restriction.
         new = NameExpr(node.name)
-        new.info = node.info
         self.copy_ref(new, node)
         return new