fix test_fileio

from_cpython/Lib/test/script_helper.py

@@ -7,7 +7,8 @@ import re
 import os.path
 import tempfile
 import subprocess
-import py_compile
+# Pyston change: we can't import this currently
+# import py_compile
 import contextlib
 import shutil
 try:

from_cpython/Lib/test/test_fileio.py

-# expected: fail
 # Adapted from test_file.py by Daniel Stutzbach
 
 from __future__ import unicode_literals
@@ -29,6 +28,8 @@ class AutoFileTests(unittest.TestCase):
             self.f.close()
         os.remove(TESTFN)
 
+    # Pyston change: disable this test becasue of GC
+    @unittest.skip("only works with refcounting")
     def testWeakRefs(self):
         # verify weak references
         p = proxy(self.f)

src/runtime/objmodel.cpp

@@ -5590,7 +5590,9 @@ void Box::delattr(BoxedString* attr, DelattrRewriteArgs* rewrite_args) {
     }
 
     if (cls->instancesHaveDictAttrs()) {
-        Py_FatalError("unimplemented");
+        BoxedDict* d = getDict();
+        d->d.erase(attr);
+        return;
     }
 
     abort();

test/CPYTHON_TEST_NOTES.md

@@ -95,7 +95,6 @@ test_exceptions         we are missing recursion-depth checking
 test_extcall            f(**kw) crashes if kw isn't a dict
 test_file2k             we abort when you try to open() a directory
 test_file_eintr         not sure
-test_fileio             [unknown]
 test_fork1              [unknown]
 test_frozen             [unknown]
 test_ftplib             [unknown]