{"ast_node_type":"variable","tokens":[{"end":36,"kind":"keyword","start":0,"text":"let"}]}
    let asm = "invalid_instruction";
    let asm_pre = r###"concat!("invalid", "_", "instruction")"###;
    let mut parser = Parser::new(asm, None, Some(asm_pre.into()), false, ParseMode::InlineAsm);