`IsVariant` fails to interpolate variant names in documentation

[alpha-tango-kilo]

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My enum:

#[derive(Debug, Clone, PartialEq, IsVariant)]
pub enum Value<'a> {
    Array(Array<'a>),
    Dictionary(Dictionary<'a>),
    Boolean(bool),
    Data(Data<'a>),
    Date(Date),
    Float(f64),
    Integer(Integer),
    Real(f64),
    String(&'a str),
    Uid(Uid),
}

cargo expand shows this:

Which is also what appears in the generated (local) documentation:

Not sure if this is an edge case I've hit or just something no one has spotted previously

If you can point me in the approximate direction I can probably write & PR a fix, looks like some quote! tomfoolery