1 files changed, 10 insertions, 1 deletions
diff --git a/py/objnone.c b/py/objnone.c
index ecc7c4b4e7..4151403b21 100644
--- a/py/objnone.c
+++ b/py/objnone.c
@@ -6,19 +6,28 @@
 #include "mpconfig.h"
 #include "qstr.h"
 #include "obj.h"
+#include "runtime0.h"
 
 typedef struct _mp_obj_none_t {
     mp_obj_base_t base;
 } mp_obj_none_t;
 
-void none_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
+static void none_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
     print(env, "None");
 }
 
+static mp_obj_t none_unary_op(int op, mp_obj_t o_in) {
+    switch (op) {
+        case RT_UNARY_OP_NOT: return mp_const_true;
+        default: return MP_OBJ_NULL; // op not supported for None
+    }
+}
+
 const mp_obj_type_t none_type = {
     { &mp_const_type },
     "NoneType",
     .print = none_print,
+    .unary_op = none_unary_op,
 };
 
 static const mp_obj_none_t none_obj = {{&none_type}};