float 32 isn't allowed by the compiler

[sdancer]

    // size cannot be used with float
    match categories {
        SegmentOptionCategories {
            typ: Some(Float { .. }),
            size: Some(opt),
            ..
        } => err(ErrorType::FloatWithSize, opt.location()),
        _ => Ok(categories.segment_type()),
    }

erlang floats: 
expected one of the supported sizes 16, 32, or 64