LiteralString

def run_query(sql: LiteralString) -> None:
    ...

def caller(arbitrary_string: str, literal_string: LiteralString) -> None:
    run_query("SELECT * FROM students")   OK
    run_query(literal_string)   OK
    run_query("SELECT * FROM " + literal_string)   OK
    run_query(arbitrary_string)   type checker error
    run_query(   type checker error
        f"SELECT * FROM students WHERE name = {arbitrary_string}"
    )