fix name lookup and parse errors

Author: elazarg

mypy/semanal.py

@@ -898,7 +898,7 @@ def analyze_metaclass(self, defn: ClassDef) -> None:
             if defn.metaclass == '<error>':
                 self.fail("Dynamic metaclass not supported for '%s'" % defn.name, defn)
                 return
-            sym = self.lookup(defn.metaclass, defn)
+            sym = self.lookup_qualified(defn.metaclass, defn)
             if sym is not None and isinstance(sym.node, TypeInfo):
                 inst = fill_typevars(sym.node)
                 assert isinstance(inst, Instance)

test-data/unit/semanal-errors.test

@@ -985,15 +985,15 @@ class A(Generic[T], Generic[S]): pass \
 [case testInvalidMetaclass]
 class A(metaclass=x): pass
 [out]
-main:3: error: Name 'x' is not defined
-main:3: error: Invalid metaclass 'x'
+main:1: error: Name 'x' is not defined
+main:1: error: Invalid metaclass 'x'
 
 [case testInvalidQualifiedMetaclass]
 import abc
 class A(metaclass=abc.Foo): pass
 [out]
-main:3: error: Name 'abc.Foo' is not defined
-main:3: error: Invalid metaclass 'abc.Foo'
+main:2: error: Name 'abc.Foo' is not defined
+main:2: error: Invalid metaclass 'abc.Foo'
 
 [case testNonClassMetaclass]
 def f(): pass