Trait ToSocketAddrs

First error

2 ctjhoa@localhost ~/rust/coreutils (git)-[master] % make TESTS='hostname' test                                                                                                                                                             :(
rm -rf /home/ctjhoa/rust/coreutils/tmp
mkdir /home/ctjhoa/rust/coreutils/tmp
cd /home/ctjhoa/rust/coreutils/deps && cargo build --package getopts --release
cd /home/ctjhoa/rust/coreutils/deps && cargo build --package libc --release
rustc -O -L /home/ctjhoa/rust/coreutils/build/ --extern getopts=/home/ctjhoa/rust/coreutils/build/libgetopts.rlib --extern libc=/home/ctjhoa/rust/coreutils/build/liblibc.rlib  --crate-type rlib --emit link,dep-info /home/ctjhoa/rust/coreutils/src/hostname/hostname.rs --out-dir /home/ctjhoa/rust/coreutils/build
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:73:32: 73:49 error: type `collections::string::String` does not implement any method in scope named `to_socket_addrs`
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:73                 match hostname.to_socket_addrs() {
                                                                                       ^~~~~~~~~~~~~~~~~
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:73:32: 73:49 help: methods from traits can only be called if the trait is in scope; the following trait is implemented but not in scope, perhaps add a `use` for it:
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:73:32: 73:49 help: candidate #1: use `std::net::addr::ToSocketAddrs`
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:82:48: 82:60 error: the type of this value must be known in this context
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:82                                 hashset.insert(addr.clone());
                                                                                                       ^~~~~~~~~~~~
error: aborting due to 2 previous errors
Makefile:288: recipe for target '/home/ctjhoa/rust/coreutils/build/libhostname.rlib' failed
make: *** [/home/ctjhoa/rust/coreutils/build/libhostname.rlib] Error 101

Second error

2 ctjhoa@localhost ~/rust/coreutils (git)-[master] % make TESTS='hostname' test                                                                                                                                                             :(
rm -rf /home/ctjhoa/rust/coreutils/tmp
mkdir /home/ctjhoa/rust/coreutils/tmp
cd /home/ctjhoa/rust/coreutils/deps && cargo build --package getopts --release
cd /home/ctjhoa/rust/coreutils/deps && cargo build --package libc --release
rustc -O -L /home/ctjhoa/rust/coreutils/build/ --extern getopts=/home/ctjhoa/rust/coreutils/build/libgetopts.rlib --extern libc=/home/ctjhoa/rust/coreutils/build/liblibc.rlib  --crate-type rlib --emit link,dep-info /home/ctjhoa/rust/coreutils/src/hostname/hostname.rs --out-dir /home/ctjhoa/rust/coreutils/build
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:24:5: 24:34 error: trait `ToSocketAddrs` is private
/home/ctjhoa/rust/coreutils/src/hostname/hostname.rs:24 use std::net::addr::ToSocketAddrs;
                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: aborting due to previous error
Makefile:288: recipe for target '/home/ctjhoa/rust/coreutils/build/libhostname.rlib' failed
make: *** [/home/ctjhoa/rust/coreutils/build/libhostname.rlib] Error 101