WTF rustc ??? (Builder pattern)

output

$ cargo build 
   Compiling project v0.1.0 (file:///home/yoeight/code/rust/project-driver)
src/project/internal/types.rs:48:30: 48:34 error: cannot move out of borrowed content
src/project/internal/types.rs:48             connection_type: self.connection_type,
                                                                 ^~~~
src/project/internal/types.rs:50:20: 50:24 error: cannot move out of borrowed content
src/project/internal/types.rs:50             creds: self.creds
                                                       ^~~~
error: aborting due to 2 previous errors
Could not compile `project`.

To learn more, run the command again with --verbose.

seriously.rs

use std::net::Ipv4Addr;
use std::net::SocketAddr;
use std::net::SocketAddrV4;
use std::net::ToSocketAddrs;

pub enum ConnectionType {
    Regular,
}

pub enum Credentials {
    NoCreds,
    Creds(String, String),
}

pub struct Settings {
    pub connection_type: ConnectionType,
    pub store_addr: SocketAddr,
    pub creds: Credentials
}

pub struct SettingsBuilder {
    connection_type: ConnectionType,
    store_addr: SocketAddr,
    creds: Credentials
}

impl SettingsBuilder {
    pub fn new(ip: Ipv4Addr, port: u16) -> SettingsBuilder {
        SettingsBuilder {
            connection_type: ConnectionType::Regular,
            store_addr: SocketAddr::V4(SocketAddrV4::new(ip, port)),
            creds: Credentials::NoCreds
        }
    }

    pub fn set_connection_type(&mut self, tpe: ConnectionType) -> &mut SettingsBuilder {
        self.connection_type = tpe;
        self
    }

    pub fn set_credentials(&mut self, creds: Credentials) -> &mut SettingsBuilder {
        self.creds = creds;
        self
    }

    pub fn finalize(&self) -> Settings { // if I drop the '&' it compiles
        Settings {
            connection_type: self.connection_type,
            store_addr: self.store_addr,
            creds: self.creds
        }
    }
}

It's because Connection and Credentials don't derive Copy. I can't do #[derive(Copy,Clone)] for Credentials but now I know why it doesn't work.