unreachable expression on derive macro

[Boog900]

When using epee_flatten on a struct with only 1 field it gives an unreachable expression error.

for example:

/// A Support Flags Response
#[derive(Debug, Clone, EpeeObject, PartialEq, Eq)]
pub struct SupportFlagsResponse {
    /// Support Flags
    #[epee_flatten]
    pub support_flags: PeerSupportFlags,
}

This is because the add field function expands to:

fn add_field<R: epee_encoding::io::Read>(
    &mut self,
    name: &str,
    r: &mut R,
) -> epee_encoding::error::Result<bool> {
    match name {
        _ => {
            if self.support_flags.add_field(name, r)? {
                return Ok(true);
            }
            return Ok(false);
        }
    };
    Ok(true)
}

and the Ok(true) is unreachable

Edit: This will happen no matter how many fields you have as long as they are all flattened:

fn add_field<R: epee_encoding::io::Read>(
    &mut self,
    name: &str,
    r: &mut R,
) -> epee_encoding::error::Result<bool> {
    match name {
        _ => {
            if self.support_flags.add_field(name, r)? {
                return Ok(true);
            }
            if self.some_other_field.add_field(name, r)? {
               return Ok(true);
            }
            return Ok(false);
        }
    };
    Ok(true)
}