os.environ updates should propagate

Just another HAVE_foo define we were missing.

from_cpython/Include/pyconfig.h

@@ -124,6 +124,7 @@
 #define HAVE_UNISTD_H 1
 #define HAVE_UTIME_H 1
 #define HAVE_WCHAR_H 1
+#define HAVE_PUTENV 1
 
 // Added this for some Pyston modifications:
 #define MAX_PYSTRING_SIZE (PY_SSIZE_T_MAX/2 - (1<<20))

from_cpython/Modules/posixmodule.c

@@ -9451,7 +9451,7 @@ INITFUNC(void)
 
 #ifdef HAVE_PUTENV
     if (posix_putenv_garbage == NULL)
-        posix_putenv_garbage = PyDict_New();
+        posix_putenv_garbage = PyGC_AddRoot(PyDict_New());
 #endif
 
     if (!initialized) {

src/runtime/list.cpp

@@ -1103,6 +1103,8 @@ void setupList() {
         "index", new BoxedFunction(boxRTFunction((void*)listIndex, BOXED_INT, 4, 2, false, false), { NULL, NULL }));
     list_cls->giveAttr("remove", new BoxedFunction(boxRTFunction((void*)listRemove, NONE, 2)));
     list_cls->giveAttr("reverse", new BoxedFunction(boxRTFunction((void*)listReverse, NONE, 1)));
+
+    list_cls->giveAttr("__hash__", None);
     list_cls->freeze();
 
     CLFunction* hasnext = boxRTFunction((void*)listiterHasnextUnboxed, BOOL, 1);

src/runtime/objmodel.cpp

@@ -2113,6 +2113,10 @@ extern "C" BoxedInt* hash(Box* obj) {
         return static_cast<BoxedInt*>(boxInt((i64)obj));
     }
 
+    if (hash == None) {
+        raiseExcHelper(TypeError, "unhashable type: '%s'", obj->cls->tp_name);
+    }
+
     Box* rtn = runtimeCall0(hash, ArgPassSpec(0));
     if (rtn->cls != int_cls) {
         raiseExcHelper(TypeError, "an integer is required");

test/tests/list.py

@@ -195,3 +195,5 @@ l.sort(cmp=mycmp, key=str)
 print types_seen
 print l
 """
+
+print repr(list.__hash__)

test/tests/os_test.py

@@ -23,8 +23,13 @@ print e.strerror
 print e.filename
 print OSError(1, 2).filename
 
-# This part needs sys.exc_info() and the three-arg raise statement
-# try:
-    # os.execvp("aoeuaoeu", ['aoeuaoeu'])
-# except OSError, e:
-    # print e
+try:
+    os.execvp("aoeuaoeu", ['aoeuaoeu'])
+except OSError, e:
+    print e
+
+# Changes to os.environ should show up in subprocesses:
+import subprocess
+env = os.environ
+env["PYTHONPATH"] = "."
+subprocess.check_call("echo PYTHONPATH is $PYTHONPATH", shell=1)