Method load_global_or_builtin

crates/vm/src/frame.rs:6125–6148

(&self, name: &Py<PyStr>, vm: &VirtualMachine)

    #[inline]
    fn load_global_or_builtin(&self, name: &Py<PyStr>, vm: &VirtualMachine) -> PyResult {
        if let Some(builtins_dict) = self.builtins_dict {
            // Fast path: both globals and builtins are exact dicts
            // SAFETY: builtins_dict is only set when globals is also exact dict
            let globals_exact = unsafe { PyExact::ref_unchecked(self.globals.as_ref()) };
            globals_exact
                .get_chain_exact(builtins_dict, name, vm)?
                .ok_or_else(|| {
                    vm.new_name_error(format!("name '{name}' is not defined"), name.to_owned())
                })
        } else {
            // Slow path: builtins is not a dict, use generic __getitem__
            if let Some(value) = self.globals.get_item_opt(name, vm)? {
                return Ok(value);
            }
            self.builtins.get_item(name, vm).map_err(|e| {
                if e.fast_isinstance(vm.ctx.exceptions.key_error) {
                    vm.new_name_error(format!("name '{name}' is not defined"), name.to_owned())
                } else {
                    e
                }
            })
        }
    }

    #[cfg_attr(feature = "flame-it", flame("Frame"))]
    fn import(&mut self, vm: &VirtualMachine, module_name: Option<&Py<PyStr>>) -> PyResult<()> {