remove test-weakref.pyi

Author: BobTheBuidler

mypyc/test-data/fixtures/ir.py

@@ -340,6 +340,7 @@ class RuntimeError(Exception): pass
 class UnicodeEncodeError(RuntimeError): pass
 class UnicodeDecodeError(RuntimeError): pass
 class NotImplementedError(RuntimeError): pass
+class ReferenceError(Exception): pass
 
 class StopIteration(Exception):
     value: Any

mypyc/test-data/fixtures/test-weakref.pyi

@@ -48,5 +48,3 @@ def test_weakref_proxy_with_callback():
     with assertRaises(ReferenceError):
         p.some_meth()
     assert _callback_called_cache["proxy"] is True
-
-[builtins fixtures/test-weakref.pyi]