restrict lhs defer to TypeAlias

Author: tungol

mypy/semanal.py

@@ -3294,9 +3294,10 @@ def should_wait_lhs(self, s: AssignmentStmt) -> bool:
             # No chance, nothing has changed.
             return False
         if isinstance(s.type, UnboundType):
-            lookup = self.lookup_qualified(s.type.name, s, suppress_errors=True)
-            if lookup and isinstance(lookup.node, PlaceholderNode):
-                return True
+            if s.type.name == "TypeAlias":
+                lookup = self.lookup_qualified(s.type.name, s, suppress_errors=True)
+                if lookup and isinstance(lookup.node, PlaceholderNode):
+                    return True
         return False
 
     def should_wait_rhs(self, rv: Expression) -> bool:

mypy/typeanal.py

@@ -1704,11 +1704,7 @@ def analyze_literal_param(self, idx: int, arg: Type, ctx: Context) -> list[Type]
             # Make sure the literal's class is ready
             sym = self.api.lookup_fully_qualified_or_none(arg.base_type_name)
             if sym is None or isinstance(sym.node, PlaceholderNode):
-                assert arg.base_type_name.startswith("builtins.")
-                if self.api.is_incomplete_namespace("builtins"):
-                    self.api.record_incomplete_ref()
-                else:
-                    self.fail(f'Name "{arg.base_type_name}" is not defined', arg)
+                self.api.record_incomplete_ref()
                 return [AnyType(TypeOfAny.special_form)]
 
             # Remap bytes and unicode into the appropriate type for the correct Python version