Add special case handling for __get__(None, NoneType)

cthulahoops · cthulahoops · commit 3765cd817bde · 2018-11-04T20:11:07.000Z
diff --git a/vm/src/obj/objfunction.rs b/vm/src/obj/objfunction.rs
@@ -1,6 +1,6 @@
 use super::super::pyobject::{
-    AttributeProtocol, PyContext, PyFuncArgs, PyObject, PyObjectKind, PyObjectRef, PyResult,
-    TypeProtocol,
+    AttributeProtocol, IdProtocol, PyContext, PyFuncArgs, PyObject, PyObjectKind, PyObjectRef,
+    PyResult, TypeProtocol,
 };
 use super::super::vm::VirtualMachine;
 use super::objtype;
@@ -22,7 +22,17 @@ pub fn init(context: &PyContext) {
 }
 
 fn bind_method(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
-    Ok(vm.new_bound_method(args.args[0].clone(), args.args[1].clone()))
+    arg_check!(
+        vm,
+        args,
+        required = [(function, None), (obj, None), (cls, None)]
+    );
+
+    if obj.is(&vm.get_none()) && !cls.is(&obj.typ()) {
+        Ok(function.clone())
+    } else {
+        Ok(vm.ctx.new_bound_method(function.clone(), obj.clone()))
+    }
 }
 
 fn member_get(vm: &mut VirtualMachine, mut args: PyFuncArgs) -> PyResult {
diff --git a/vm/src/vm.rs b/vm/src/vm.rs
@@ -17,8 +17,8 @@ use super::obj::objsequence;
 use super::obj::objstr;
 use super::obj::objtype;
 use super::pyobject::{
-    AttributeProtocol, DictProtocol, IdProtocol, PyContext, PyFuncArgs, PyObjectKind, PyObjectRef,
-    PyResult, TypeProtocol,
+    AttributeProtocol, DictProtocol, PyContext, PyFuncArgs, PyObjectKind, PyObjectRef, PyResult,
+    TypeProtocol,
 };
 use super::stdlib;
 use super::sysmodule;
@@ -92,14 +92,6 @@ impl VirtualMachine {
         self.ctx.none()
     }
 
-    pub fn new_bound_method(&self, function: PyObjectRef, object: PyObjectRef) -> PyObjectRef {
-        if object.is(&self.get_none()) {
-            function
-        } else {
-            self.ctx.new_bound_method(function, object)
-        }
-    }
-
     pub fn get_type(&self) -> PyObjectRef {
         self.ctx.type_type()
     }
