Method try_from_object

crates/vm/src/builtins/builtin_func.rs:274–284

(vm: &VirtualMachine, obj: PyObjectRef)

impl TryFromObject for NativeFunctionOrMethod {
    fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
        let class = vm.ctx.types.builtin_function_or_method_type;
        if obj.fast_isinstance(class) {
            // Both PyNativeFunction and PyNativeMethod share the same type now.
            // PyNativeMethod has `func: PyNativeFunction` as its first field,
            // so we can safely treat the data pointer as PyNativeFunction for reading.
            Ok(Self(unsafe { obj.downcast_unchecked() }))
        } else {
            Err(vm.new_downcast_type_error(class, &obj))
        }
    }
}