How to use the libcst._parser.production_decorator.with_production function in libcst

@with_production("expr", "xor_expr ('|' xor_expr)*")
@with_production("xor_expr", "and_expr ('^' and_expr)*")
@with_production("and_expr", "shift_expr ('&' shift_expr)*")
@with_production("shift_expr", "arith_expr (('<<'|'>>') arith_expr)*")
@with_production("arith_expr", "term (('+'|'-') term)*")
@with_production("term", "factor (('*'|'@'|'/'|'%'|'//') factor)*")
def convert_binop(
    config: ParserConfig, children: typing.Sequence[typing.Any]
) -> typing.Any:
    leftexpr, *rightexprs = children
    if len(rightexprs) == 0:
        return leftexpr

    whitespace_before = leftexpr.whitespace_before
    leftexpr = leftexpr.value

    # Convert all of the operations that have no precedence in a loop

@with_production("sync_comp_for", "'for' exprlist 'in' or_test comp_if* [comp_for]")
def convert_sync_comp_for(
    config: ParserConfig, children: typing.Sequence[typing.Any]
) -> typing.Any:
    # unpack
    for_tok, target, in_tok, iter, *trailing = children
    if len(trailing) and isinstance(trailing[-1], CompFor):
        *ifs, inner_for_in = trailing
    else:
        ifs, inner_for_in = trailing, None

    return CompFor(
        target=target.value,
        iter=iter.value,
        ifs=ifs,
        inner_for_in=inner_for_in,
        whitespace_before=parse_parenthesizable_whitespace(

@with_production(
    "if_stmt_elif", "'elif' test ':' suite [if_stmt_elif|if_stmt_else]", version="<=3.7"
)
@with_production(
    "if_stmt_elif",
    "'elif' namedexpr_test ':' suite [if_stmt_elif|if_stmt_else]",
    version=">=3.8",
)
def convert_if_stmt_elif(config: ParserConfig, children: Sequence[Any]) -> Any:
    # this behaves exactly the same as `convert_if_stmt`, except that the leading token
    # has a different string value.
    return convert_if_stmt(config, children)

@with_production("atom_curlybraces", "'{' [dictorsetmaker] '}'")
def convert_atom_curlybraces(
    config: ParserConfig, children: typing.Sequence[typing.Any]
) -> typing.Any:
    lbrace_tok, *body, rbrace_tok = children
    lbrace = LeftCurlyBrace(
        whitespace_after=parse_parenthesizable_whitespace(
            config, lbrace_tok.whitespace_after
        )
    )

    rbrace = RightCurlyBrace(
        whitespace_before=parse_parenthesizable_whitespace(
            config, rbrace_tok.whitespace_before
        )
    )

@with_production(
    "trailer", "trailer_arglist | trailer_subscriptlist | trailer_attribute"
)
def convert_trailer(
    config: ParserConfig, children: typing.Sequence[typing.Any]
) -> typing.Any:
    (child,) = children
    return child

@with_production("annassign", "':' test ['=' test]", version=">=3.6,<3.8")
@with_production(
    "annassign", "':' test ['=' (yield_expr|testlist_star_expr)]", version=">=3.8"
)
def convert_annassign(config: ParserConfig, children: Sequence[Any]) -> Any:
    if len(children) == 2:
        # Variable annotation only
        colon, annotation = children
        annotation = annotation.value
        equal = None
        value = None
    elif len(children) == 4:
        # Variable annotation and assignment
        colon, annotation, equal, value = children
        annotation = annotation.value
        value = value.value
        equal = AssignEqual(

@with_production(
    "testlist_comp_tuple",
    "(test|star_expr) ( comp_for | (',' (test|star_expr))* [','] )",
    version="<=3.7",
)
@with_production(
    "testlist_comp_tuple",
    "(namedexpr_test|star_expr) ( comp_for | (',' (namedexpr_test|star_expr))* [','] )",
    version=">=3.8",
)
def convert_testlist_comp_tuple(
    config: ParserConfig, children: typing.Sequence[typing.Any]
) -> typing.Any:
    return _convert_testlist_comp(
        config,
        children,
        single_child_is_sequence=False,

@with_production("tfpdef_starstar", "'**' tfpdef")
@with_production("vfpdef_starstar", "'**' vfpdef")
def convert_fpdef_starstar(config: ParserConfig, children: Sequence[Any]) -> Any:
    starstar, param = children
    return param.with_changes(
        star=starstar.string,
        whitespace_after_star=parse_parenthesizable_whitespace(
            config, starstar.whitespace_after
        ),

@with_production("tfpdef_star", "'*' [tfpdef]")
@with_production("vfpdef_star", "'*' [vfpdef]")
def convert_fpdef_star(config: ParserConfig, children: Sequence[Any]) -> Any:
    if len(children) == 1:
        (star,) = children
        return ParamStarPartial()
    else:
        star, param = children
        return param.with_changes(
            star=star.string,
            whitespace_after_star=parse_parenthesizable_whitespace(
                config, star.whitespace_after
            ),

@with_production(
    "arg_assign_comp_for", "test [comp_for] | test '=' test", version="<=3.7"
)
@with_production(
    "arg_assign_comp_for",
    "test [comp_for] | test ':=' test | test '=' test",
    version=">=3.8",
)
def convert_arg_assign_comp_for(
    config: ParserConfig, children: typing.Sequence[typing.Any]
) -> typing.Any:
    if len(children) == 1:
        # Simple test
        (child,) = children
        return Arg(value=child.value)
    elif len(children) == 2:
        elt, for_in = children