fix __repr__ for PNone, handle ...at 0xabcd> in unit test output

Author: lukasstadler

graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/PythonTests.java

@@ -169,7 +169,7 @@ public static void assertPrints(String expected, String code) {
         String source = code;
         PythonTests.runScript(new String[0], source, printStream, System.err);
         String result = byteArray.toString().replaceAll("\r\n", "\n");
-        assertEquals(expected, result);
+        assertEquals(expected.replaceAll(" at 0x[0-9a-f]*>", " at 0xabcd>"), result.replaceAll(" at 0x[0-9a-f]*>", " at 0xabcd>"));
     }
 
     public static VirtualFrame createVirtualFrame() {

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/object/ObjectBuiltins.java

@@ -175,6 +175,9 @@ public abstract static class ReprNode extends PythonUnaryBuiltinNode {
         @TruffleBoundary
         Object repr(Object self,
                         @Cached("create()") GetClassNode getClass) {
+            if (self == PNone.NONE) {
+                return "None";
+            }
             return String.format("<%s object at 0x%x>", getClass.execute(self).getName(), self.hashCode());
         }
     }

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/nodes/object/GetClassNode.java

@@ -207,6 +207,6 @@ public static String getNameSlowPath(Object o) {
         if (PGuards.isForeignObject(o)) {
             return BuiltinNames.FOREIGN;
         }
-        return PythonBuiltinClassType.fromClass(o.getClass()).name();
+        return PythonBuiltinClassType.fromClass(o.getClass()).toString();
     }
 }