Index: Modules/main.c
===================================================================
--- Modules/main.c	(revision 42248)
+++ Modules/main.c	(working copy)
@@ -132,27 +132,42 @@
 	}
 }
 
-/* Get the path to a top-level module */
-static struct filedescr * FindModule(const char *module,
-				     FILE **fp, char **filename)
-{
-	struct filedescr *fdescr = NULL;
-	*fp = NULL;
-	*filename = malloc(MAXPATHLEN);
 
-	if (*filename == NULL)
-		return NULL;
-
-	/* Find the actual module source code */
-	fdescr = _PyImport_FindModule(module, NULL,
-					*filename, MAXPATHLEN, fp, NULL);
-
-	if (fdescr == NULL) {
-		free(*filename);
-		*filename = NULL;
+static int RunModule(char *module)
+{
+	PyObject *runpy, *runmodule, *runargs, *result;
+	runpy = PyImport_ImportModule("runpy");
+	if (runpy == NULL) {
+		fprintf(stderr, "Could not import runpy module\n");
+		return -1;
 	}
-
-	return fdescr;
+	runmodule = PyObject_GetAttrString(runpy, "run_module");
+	if (runmodule == NULL) {
+		fprintf(stderr, "Could not access runpy.run_module\n");
+		Py_DECREF(runpy);
+		return -1;
+	}
+	runargs = Py_BuildValue("sOsO", module,
+							Py_None, "__main__", Py_True);
+	if (runargs == NULL) {
+		fprintf(stderr,
+				"Could not create arguments for runpy.run_module\n");
+		Py_DECREF(runpy);
+		Py_DECREF(runmodule);
+		return -1;
+	}
+	result = PyObject_Call(runmodule, runargs, NULL);
+	if (result == NULL) {
+		PyErr_Print();
+	}
+	Py_DECREF(runpy);
+	Py_DECREF(runmodule);
+	Py_DECREF(runargs);
+	if (result == NULL) {
+		return -1;
+	}
+	Py_DECREF(result);
+	return 0;
 }
 
 /* Main program */
@@ -440,28 +455,9 @@
 	}
 
 	if (module != NULL) {
-		/* Backup _PyOS_optind and find the real file */
-                struct filedescr *fdescr = NULL;
+		/* Backup _PyOS_optind and force sys.arv[0] = module */
 		_PyOS_optind--;
-		if ((fdescr = FindModule(module, &fp, &filename))) {
-			argv[_PyOS_optind] = filename;
-		} else {
-			fprintf(stderr, "%s: module %s not found\n",
-				argv[0], module);
-			return 2;
-		}
-		if (!fp) {
-			fprintf(stderr,
-				"%s: module %s has no associated file\n",
-				argv[0], module);
-			return 2;
-		}
-		if (!_PyImport_IsScript(fdescr)) {
-			fprintf(stderr,
-				"%s: module %s not usable as script\n  (%s)\n",
-				argv[0], module, filename);
-			return 2;
-		}
+        argv[_PyOS_optind] = module;
 	}
 
 	PySys_SetArgv(argc-_PyOS_optind, argv+_PyOS_optind);
@@ -480,9 +476,8 @@
 		sts = PyRun_SimpleStringFlags(command, &cf) != 0;
 		free(command);
 	} else if (module) {
-		sts = PyRun_AnyFileExFlags(fp, filename, 1, &cf) != 0;
+		sts = RunModule(module);
 		free(module);
-		free(filename);
 	}
 	else {
 		if (filename == NULL && stdin_is_interactive) {