{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
        let file_system_edit = FileSystemEdit::CreateFile { dst, initial_contents: content.into() };
    pub fn create_file(&mut self, dst: AnchoredPathBuf, content: impl Into<String>) {
        self.source_change.push_file_system_edit(file_system_edit);