StarredDictElement can produce syntactically incorrect output

[graingert]

eg I expect the following to generate '{"ham": "spam", **({"x": x} if x else {})}'

from libcst import (
    Dict,
    DictElement,
    SimpleString,
    Name,
    LeftParen,
    RightParen,
    StarredDictElement,
    IfExp,
    Module,
    parse_expression,
)

d = Module(
    [
        Dict(
            elements=[
                DictElement(
                    key=SimpleString(value='"ham"'), value=SimpleString(value='"spam"')
                ),
                StarredDictElement(
                    value=IfExp(
                        test=Name(value="x"),
                        body=Dict(
                            elements=[
                                DictElement(
                                    key=SimpleString(value='"x"'), value=Name(value="x")
                                )
                            ]
                        ),
                        orelse=Dict(elements=[]),
                    )
                ),
            ]
        )
    ]
)
parse_expression(d.code)  # SyntaxError
assert d.code == '{"ham": "spam", **({"x": x} if x else {})}'

however I get '{"ham": "spam", **{"x": x} if x else {}}'

[graingert]

I need to add an additional lpar=[LeftParen()], rpar=[RightParen()]:

Dict(
    elements=[
        DictElement(
            key=SimpleString(value='"ham"'), value=SimpleString(value='"spam"')
        ),
        StarredDictElement(
            value=IfExp(
                test=Name(value="x"),
                body=Dict(
                    elements=[
                        DictElement(
                            key=SimpleString(value='"x"'), value=Name(value="x")
                        )
                    ]
                ),
                orelse=Dict(elements=[]),
                lpar=[LeftParen()],
                rpar=[RightParen()],
            )
        ),
    ]
)

[graingert]

I have the same problem with all of cst.IfExp, cst.BooleanOperation, cst.BinaryOperation, but I'm sure there's more