RustPython
diff --git a/‎crates/vm/src/builtins/type.rs‎
Lines changed: 4 additions & 4 deletions b/‎crates/vm/src/builtins/type.rs‎
Lines changed: 4 additions & 4 deletions
@@ -592,12 +592,12 @@ impl PyType {
             slots.flags |= PyTypeFlags::HAS_DICT
         }
 
-        // Inherit HAS_WEAKREF from any base in MRO that has it
+        // Inherit HAS_WEAKREF/MANAGED_WEAKREF from any base in MRO that has it
         if mro
             .iter()
             .any(|b| b.slots.flags.has_feature(PyTypeFlags::HAS_WEAKREF))
         {
-            slots.flags |= PyTypeFlags::HAS_WEAKREF
+            slots.flags |= PyTypeFlags::HAS_WEAKREF | PyTypeFlags::MANAGED_WEAKREF
         }
 
         // Inherit SEQUENCE and MAPPING flags from base classes
@@ -662,7 +662,7 @@ impl PyType {
             slots.flags |= PyTypeFlags::HAS_DICT
         }
         if base.slots.flags.has_feature(PyTypeFlags::HAS_WEAKREF) {
-            slots.flags |= PyTypeFlags::HAS_WEAKREF
+            slots.flags |= PyTypeFlags::HAS_WEAKREF | PyTypeFlags::MANAGED_WEAKREF
         }
 
         // Inherit SEQUENCE and MAPPING flags from base class
@@ -1989,7 +1989,7 @@ impl Constructor for PyType {
         // 2. __weakref__ is in __slots__
         let may_add_weakref = !base.slots.flags.has_feature(PyTypeFlags::HAS_WEAKREF);
         if (heaptype_slots.is_none() && may_add_weakref) || add_weakref {
-            flags |= PyTypeFlags::HAS_WEAKREF;
+            flags |= PyTypeFlags::HAS_WEAKREF | PyTypeFlags::MANAGED_WEAKREF;
         }
 
         let (slots, heaptype_ext) = {
Original file line number	Diff line number	Diff line change
`@@ -592,12 +592,12 @@ impl PyType {`
`592`	`592`	`slots.flags \|= PyTypeFlags::HAS_DICT`
`593`	`593`	`}`
`594`	`594`
`595`		`- // Inherit HAS_WEAKREF from any base in MRO that has it`
	`595`	`+ // Inherit HAS_WEAKREF/MANAGED_WEAKREF from any base in MRO that has it`
`596`	`596`	`if mro`
`597`	`597`	`.iter()`
`598`	`598`	`.any(\|b\| b.slots.flags.has_feature(PyTypeFlags::HAS_WEAKREF))`
`599`	`599`	`{`
`600`		`- slots.flags \|= PyTypeFlags::HAS_WEAKREF`
	`600`	`+ slots.flags \|= PyTypeFlags::HAS_WEAKREF \| PyTypeFlags::MANAGED_WEAKREF`
`601`	`601`	`}`
`602`	`602`
`603`	`603`	`// Inherit SEQUENCE and MAPPING flags from base classes`
`@@ -662,7 +662,7 @@ impl PyType {`
`662`	`662`	`slots.flags \|= PyTypeFlags::HAS_DICT`
`663`	`663`	`}`
`664`	`664`	`if base.slots.flags.has_feature(PyTypeFlags::HAS_WEAKREF) {`
`665`		`- slots.flags \|= PyTypeFlags::HAS_WEAKREF`
	`665`	`+ slots.flags \|= PyTypeFlags::HAS_WEAKREF \| PyTypeFlags::MANAGED_WEAKREF`
`666`	`666`	`}`
`667`	`667`
`668`	`668`	`// Inherit SEQUENCE and MAPPING flags from base class`
`@@ -1989,7 +1989,7 @@ impl Constructor for PyType {`
`1989`	`1989`	`// 2. __weakref__ is in __slots__`
`1990`	`1990`	`let may_add_weakref = !base.slots.flags.has_feature(PyTypeFlags::HAS_WEAKREF);`
`1991`	`1991`	`if (heaptype_slots.is_none() && may_add_weakref) \|\| add_weakref {`
`1992`		`- flags \|= PyTypeFlags::HAS_WEAKREF;`
	`1992`	`+ flags \|= PyTypeFlags::HAS_WEAKREF \| PyTypeFlags::MANAGED_WEAKREF;`
`1993`	`1993`	`}`
`1994`	`1994`
`1995`	`1995`	`let (slots, heaptype_ext) = {`