Dec 11 10:20:07.783 INFO checking ryota-sakamoto/rust_study against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 11 10:20:07.783 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-5/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 11 10:20:08.084 INFO [stdout] 2d9050042247a3d5d187190a8a1ea2f8ce5f32383cb812221251e8d1d1d01063
Dec 11 10:20:08.090 INFO running `"docker" "start" "-a" "2d9050042247a3d5d187190a8a1ea2f8ce5f32383cb812221251e8d1d1d01063"`
Dec 11 10:20:08.880 INFO [stderr] usermod: no changes
Dec 11 10:20:08.988 INFO [stderr]     Checking rust_test v0.1.0 (/source)
Dec 11 10:20:09.429 INFO [stderr] warning: unused macro definition
Dec 11 10:20:09.429 INFO [stderr]   --> src/list.rs:53:1
Dec 11 10:20:09.429 INFO [stderr]    |
Dec 11 10:20:09.429 INFO [stderr] 53 | / macro_rules! list {
Dec 11 10:20:09.429 INFO [stderr] 54 | |     ($($n: expr),*) => {
Dec 11 10:20:09.429 INFO [stderr] 55 | |         {
Dec 11 10:20:09.429 INFO [stderr] 56 | |             let mut list = List::empty_list();
Dec 11 10:20:09.429 INFO [stderr] ...  |
Dec 11 10:20:09.429 INFO [stderr] 74 | |     };
Dec 11 10:20:09.429 INFO [stderr] 75 | | }
Dec 11 10:20:09.429 INFO [stderr]    | |_^
Dec 11 10:20:09.429 INFO [stderr]    |
Dec 11 10:20:09.429 INFO [stderr]    = note: #[warn(unused_macros)] on by default
Dec 11 10:20:09.429 INFO [stderr] 
Dec 11 10:20:09.464 INFO [stderr] warning: unused macro definition
Dec 11 10:20:09.464 INFO [stderr]   --> src/list.rs:53:1
Dec 11 10:20:09.464 INFO [stderr]    |
Dec 11 10:20:09.464 INFO [stderr] 53 | / macro_rules! list {
Dec 11 10:20:09.464 INFO [stderr] 54 | |     ($($n: expr),*) => {
Dec 11 10:20:09.464 INFO [stderr] 55 | |         {
Dec 11 10:20:09.464 INFO [stderr] 56 | |             let mut list = List::empty_list();
Dec 11 10:20:09.464 INFO [stderr] ...  |
Dec 11 10:20:09.464 INFO [stderr] 74 | |     };
Dec 11 10:20:09.464 INFO [stderr] 75 | | }
Dec 11 10:20:09.464 INFO [stderr]    | |_^
Dec 11 10:20:09.464 INFO [stderr]    |
Dec 11 10:20:09.464 INFO [stderr]    = note: #[warn(unused_macros)] on by default
Dec 11 10:20:09.464 INFO [stderr] 
Dec 11 10:20:09.532 INFO [stderr] warning: function is never used: `call`
Dec 11 10:20:09.532 INFO [stderr]  --> src/module.rs:1:1
Dec 11 10:20:09.532 INFO [stderr]   |
Dec 11 10:20:09.532 INFO [stderr] 1 | pub fn call() {
Dec 11 10:20:09.532 INFO [stderr]   | ^^^^^^^^^^^^^
Dec 11 10:20:09.532 INFO [stderr]   |
Dec 11 10:20:09.539 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 10:20:09.539 INFO [stderr] 
Dec 11 10:20:09.539 INFO [stderr] warning: enum is never used: `List`
Dec 11 10:20:09.539 INFO [stderr]  --> src/list.rs:4:1
Dec 11 10:20:09.539 INFO [stderr]   |
Dec 11 10:20:09.539 INFO [stderr] 4 | pub enum List<T: Debug> {
Dec 11 10:20:09.539 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.539 INFO [stderr] 
Dec 11 10:20:09.539 INFO [stderr] warning: method is never used: `empty_list`
Dec 11 10:20:09.539 INFO [stderr]   --> src/list.rs:13:5
Dec 11 10:20:09.539 INFO [stderr]    |
Dec 11 10:20:09.539 INFO [stderr] 13 |     pub fn empty_list() -> List<T> {
Dec 11 10:20:09.539 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.539 INFO [stderr] 
Dec 11 10:20:09.540 INFO [stderr] warning: method is never used: `prepend`
Dec 11 10:20:09.540 INFO [stderr]   --> src/list.rs:17:5
Dec 11 10:20:09.540 INFO [stderr]    |
Dec 11 10:20:09.540 INFO [stderr] 17 |     pub fn prepend(self, t: T) -> Self {
Dec 11 10:20:09.540 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.540 INFO [stderr] 
Dec 11 10:20:09.540 INFO [stderr] warning: method is never used: `head`
Dec 11 10:20:09.540 INFO [stderr]   --> src/list.rs:24:5
Dec 11 10:20:09.540 INFO [stderr]    |
Dec 11 10:20:09.540 INFO [stderr] 24 |     pub fn head(&self) -> &T {
Dec 11 10:20:09.540 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.540 INFO [stderr] 
Dec 11 10:20:09.540 INFO [stderr] warning: method is never used: `last`
Dec 11 10:20:09.540 INFO [stderr]   --> src/list.rs:31:5
Dec 11 10:20:09.540 INFO [stderr]    |
Dec 11 10:20:09.540 INFO [stderr] 31 |     pub fn last(&self) -> &T {
Dec 11 10:20:09.540 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.540 INFO [stderr] 
Dec 11 10:20:09.540 INFO [stderr] warning: method is never used: `is_empty`
Dec 11 10:20:09.540 INFO [stderr]   --> src/list.rs:44:5
Dec 11 10:20:09.540 INFO [stderr]    |
Dec 11 10:20:09.540 INFO [stderr] 44 |     fn is_empty(&self) -> bool {
Dec 11 10:20:09.540 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.540 INFO [stderr] 
Dec 11 10:20:09.540 INFO [stderr] warning: function is never used: `tailrec`
Dec 11 10:20:09.540 INFO [stderr]   --> src/list.rs:87:1
Dec 11 10:20:09.540 INFO [stderr]    |
Dec 11 10:20:09.540 INFO [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
Dec 11 10:20:09.540 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.540 INFO [stderr] 
Dec 11 10:20:09.555 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.556 INFO [stderr]   --> src/list.rs:27:26
Dec 11 10:20:09.556 INFO [stderr]    |
Dec 11 10:20:09.556 INFO [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
Dec 11 10:20:09.556 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.556 INFO [stderr]    |                          |
Dec 11 10:20:09.556 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.556 INFO [stderr]    |
Dec 11 10:20:09.556 INFO [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
Dec 11 10:20:09.556 INFO [stderr] 
Dec 11 10:20:09.556 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.556 INFO [stderr]   --> src/list.rs:34:26
Dec 11 10:20:09.556 INFO [stderr]    |
Dec 11 10:20:09.556 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.556 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.556 INFO [stderr]    |                          |
Dec 11 10:20:09.556 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.556 INFO [stderr] 
Dec 11 10:20:09.556 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.556 INFO [stderr]   --> src/list.rs:34:42
Dec 11 10:20:09.556 INFO [stderr]    |
Dec 11 10:20:09.556 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.556 INFO [stderr]    |                                          -----^^^^^^^^^
Dec 11 10:20:09.556 INFO [stderr]    |                                          |
Dec 11 10:20:09.556 INFO [stderr]    |                                          help: remove this
Dec 11 10:20:09.556 INFO [stderr] 
Dec 11 10:20:09.556 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.556 INFO [stderr]   --> src/list.rs:90:22
Dec 11 10:20:09.556 INFO [stderr]    |
Dec 11 10:20:09.556 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.556 INFO [stderr]    |                      -----^^^^^^^^^
Dec 11 10:20:09.556 INFO [stderr]    |                      |
Dec 11 10:20:09.556 INFO [stderr]    |                      help: remove this
Dec 11 10:20:09.556 INFO [stderr] 
Dec 11 10:20:09.556 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.556 INFO [stderr]   --> src/list.rs:90:38
Dec 11 10:20:09.556 INFO [stderr]    |
Dec 11 10:20:09.556 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.556 INFO [stderr]    |                                      -----^^^^^^^^^
Dec 11 10:20:09.556 INFO [stderr]    |                                      |
Dec 11 10:20:09.556 INFO [stderr]    |                                      help: remove this
Dec 11 10:20:09.556 INFO [stderr] 
Dec 11 10:20:09.556 INFO [stderr] warning: function is never used: `call`
Dec 11 10:20:09.556 INFO [stderr]  --> src/module.rs:1:1
Dec 11 10:20:09.556 INFO [stderr]   |
Dec 11 10:20:09.556 INFO [stderr] 1 | pub fn call() {
Dec 11 10:20:09.556 INFO [stderr]   | ^^^^^^^^^^^^^
Dec 11 10:20:09.556 INFO [stderr]   |
Dec 11 10:20:09.556 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 11 10:20:09.560 INFO [stderr] 
Dec 11 10:20:09.560 INFO [stderr] warning: enum is never used: `List`
Dec 11 10:20:09.560 INFO [stderr]  --> src/list.rs:4:1
Dec 11 10:20:09.560 INFO [stderr]   |
Dec 11 10:20:09.560 INFO [stderr] 4 | pub enum List<T: Debug> {
Dec 11 10:20:09.560 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.560 INFO [stderr] 
Dec 11 10:20:09.560 INFO [stderr] warning: method is never used: `empty_list`
Dec 11 10:20:09.560 INFO [stderr]   --> src/list.rs:13:5
Dec 11 10:20:09.560 INFO [stderr]    |
Dec 11 10:20:09.560 INFO [stderr] 13 |     pub fn empty_list() -> List<T> {
Dec 11 10:20:09.560 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.560 INFO [stderr] 
Dec 11 10:20:09.560 INFO [stderr] warning: method is never used: `prepend`
Dec 11 10:20:09.560 INFO [stderr]   --> src/list.rs:17:5
Dec 11 10:20:09.560 INFO [stderr]    |
Dec 11 10:20:09.560 INFO [stderr] 17 |     pub fn prepend(self, t: T) -> Self {
Dec 11 10:20:09.560 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.560 INFO [stderr] 
Dec 11 10:20:09.560 INFO [stderr] warning: method is never used: `head`
Dec 11 10:20:09.560 INFO [stderr]   --> src/list.rs:24:5
Dec 11 10:20:09.560 INFO [stderr]    |
Dec 11 10:20:09.560 INFO [stderr] 24 |     pub fn head(&self) -> &T {
Dec 11 10:20:09.560 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.560 INFO [stderr] 
Dec 11 10:20:09.560 INFO [stderr] warning: method is never used: `last`
Dec 11 10:20:09.561 INFO [stderr]   --> src/list.rs:31:5
Dec 11 10:20:09.561 INFO [stderr]    |
Dec 11 10:20:09.561 INFO [stderr] 31 |     pub fn last(&self) -> &T {
Dec 11 10:20:09.561 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.561 INFO [stderr] 
Dec 11 10:20:09.561 INFO [stderr] warning: method is never used: `is_empty`
Dec 11 10:20:09.561 INFO [stderr]   --> src/list.rs:44:5
Dec 11 10:20:09.561 INFO [stderr]    |
Dec 11 10:20:09.561 INFO [stderr] 44 |     fn is_empty(&self) -> bool {
Dec 11 10:20:09.561 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.561 INFO [stderr] 
Dec 11 10:20:09.561 INFO [stderr] warning: function is never used: `tailrec`
Dec 11 10:20:09.561 INFO [stderr]   --> src/list.rs:87:1
Dec 11 10:20:09.561 INFO [stderr]    |
Dec 11 10:20:09.561 INFO [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
Dec 11 10:20:09.561 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.561 INFO [stderr] 
Dec 11 10:20:09.592 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.592 INFO [stderr]   --> src/list.rs:27:26
Dec 11 10:20:09.592 INFO [stderr]    |
Dec 11 10:20:09.592 INFO [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
Dec 11 10:20:09.592 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.592 INFO [stderr]    |                          |
Dec 11 10:20:09.592 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.592 INFO [stderr]    |
Dec 11 10:20:09.592 INFO [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
Dec 11 10:20:09.592 INFO [stderr] 
Dec 11 10:20:09.592 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.592 INFO [stderr]   --> src/list.rs:34:26
Dec 11 10:20:09.592 INFO [stderr]    |
Dec 11 10:20:09.592 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.592 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.592 INFO [stderr]    |                          |
Dec 11 10:20:09.593 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.593 INFO [stderr] 
Dec 11 10:20:09.593 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.593 INFO [stderr]   --> src/list.rs:34:42
Dec 11 10:20:09.593 INFO [stderr]    |
Dec 11 10:20:09.593 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.593 INFO [stderr]    |                                          -----^^^^^^^^^
Dec 11 10:20:09.593 INFO [stderr]    |                                          |
Dec 11 10:20:09.593 INFO [stderr]    |                                          help: remove this
Dec 11 10:20:09.593 INFO [stderr] 
Dec 11 10:20:09.593 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.593 INFO [stderr]   --> src/list.rs:90:22
Dec 11 10:20:09.593 INFO [stderr]    |
Dec 11 10:20:09.593 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.593 INFO [stderr]    |                      -----^^^^^^^^^
Dec 11 10:20:09.593 INFO [stderr]    |                      |
Dec 11 10:20:09.593 INFO [stderr]    |                      help: remove this
Dec 11 10:20:09.593 INFO [stderr] 
Dec 11 10:20:09.593 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.593 INFO [stderr]   --> src/list.rs:90:38
Dec 11 10:20:09.593 INFO [stderr]    |
Dec 11 10:20:09.593 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.593 INFO [stderr]    |                                      -----^^^^^^^^^
Dec 11 10:20:09.593 INFO [stderr]    |                                      |
Dec 11 10:20:09.593 INFO [stderr]    |                                      help: remove this
Dec 11 10:20:09.593 INFO [stderr] 
Dec 11 10:20:09.784 INFO [stderr] warning: unused macro definition
Dec 11 10:20:09.784 INFO [stderr]   --> src/list.rs:53:1
Dec 11 10:20:09.784 INFO [stderr]    |
Dec 11 10:20:09.784 INFO [stderr] 53 | / macro_rules! list {
Dec 11 10:20:09.784 INFO [stderr] 54 | |     ($($n: expr),*) => {
Dec 11 10:20:09.784 INFO [stderr] 55 | |         {
Dec 11 10:20:09.784 INFO [stderr] 56 | |             let mut list = List::empty_list();
Dec 11 10:20:09.784 INFO [stderr] ...  |
Dec 11 10:20:09.784 INFO [stderr] 74 | |     };
Dec 11 10:20:09.784 INFO [stderr] 75 | | }
Dec 11 10:20:09.784 INFO [stderr]    | |_^
Dec 11 10:20:09.784 INFO [stderr]    |
Dec 11 10:20:09.784 INFO [stderr]    = note: #[warn(unused_macros)] on by default
Dec 11 10:20:09.784 INFO [stderr] 
Dec 11 10:20:09.874 INFO [stderr] warning: unused macro definition
Dec 11 10:20:09.874 INFO [stderr]   --> src/list.rs:53:1
Dec 11 10:20:09.874 INFO [stderr]    |
Dec 11 10:20:09.874 INFO [stderr] 53 | / macro_rules! list {
Dec 11 10:20:09.874 INFO [stderr] 54 | |     ($($n: expr),*) => {
Dec 11 10:20:09.874 INFO [stderr] 55 | |         {
Dec 11 10:20:09.874 INFO [stderr] 56 | |             let mut list = List::empty_list();
Dec 11 10:20:09.874 INFO [stderr] ...  |
Dec 11 10:20:09.874 INFO [stderr] 74 | |     };
Dec 11 10:20:09.874 INFO [stderr] 75 | | }
Dec 11 10:20:09.874 INFO [stderr]    | |_^
Dec 11 10:20:09.874 INFO [stderr]    |
Dec 11 10:20:09.874 INFO [stderr]    = note: #[warn(unused_macros)] on by default
Dec 11 10:20:09.874 INFO [stderr] 
Dec 11 10:20:09.890 INFO [stderr] warning: method is never used: `head`
Dec 11 10:20:09.890 INFO [stderr]   --> src/list.rs:24:5
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr] 24 |     pub fn head(&self) -> &T {
Dec 11 10:20:09.890 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 11 10:20:09.890 INFO [stderr] 
Dec 11 10:20:09.890 INFO [stderr] warning: method is never used: `last`
Dec 11 10:20:09.890 INFO [stderr]   --> src/list.rs:31:5
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr] 31 |     pub fn last(&self) -> &T {
Dec 11 10:20:09.890 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.890 INFO [stderr] 
Dec 11 10:20:09.890 INFO [stderr] warning: method is never used: `is_empty`
Dec 11 10:20:09.890 INFO [stderr]   --> src/list.rs:44:5
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr] 44 |     fn is_empty(&self) -> bool {
Dec 11 10:20:09.890 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.890 INFO [stderr] 
Dec 11 10:20:09.890 INFO [stderr] warning: function is never used: `tailrec`
Dec 11 10:20:09.890 INFO [stderr]   --> src/list.rs:87:1
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
Dec 11 10:20:09.890 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.890 INFO [stderr] 
Dec 11 10:20:09.890 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.890 INFO [stderr]   --> src/list.rs:27:26
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
Dec 11 10:20:09.890 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.890 INFO [stderr]    |                          |
Dec 11 10:20:09.890 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
Dec 11 10:20:09.890 INFO [stderr] 
Dec 11 10:20:09.890 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.890 INFO [stderr]   --> src/list.rs:34:26
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.890 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.890 INFO [stderr]    |                          |
Dec 11 10:20:09.890 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.890 INFO [stderr] 
Dec 11 10:20:09.890 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.890 INFO [stderr]   --> src/list.rs:34:42
Dec 11 10:20:09.890 INFO [stderr]    |
Dec 11 10:20:09.890 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.891 INFO [stderr]    |                                          -----^^^^^^^^^
Dec 11 10:20:09.891 INFO [stderr]    |                                          |
Dec 11 10:20:09.891 INFO [stderr]    |                                          help: remove this
Dec 11 10:20:09.891 INFO [stderr] 
Dec 11 10:20:09.891 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.891 INFO [stderr]   --> src/list.rs:90:22
Dec 11 10:20:09.891 INFO [stderr]    |
Dec 11 10:20:09.891 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.891 INFO [stderr]    |                      -----^^^^^^^^^
Dec 11 10:20:09.891 INFO [stderr]    |                      |
Dec 11 10:20:09.891 INFO [stderr]    |                      help: remove this
Dec 11 10:20:09.891 INFO [stderr] 
Dec 11 10:20:09.891 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.891 INFO [stderr]   --> src/list.rs:90:38
Dec 11 10:20:09.891 INFO [stderr]    |
Dec 11 10:20:09.891 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.891 INFO [stderr]    |                                      -----^^^^^^^^^
Dec 11 10:20:09.891 INFO [stderr]    |                                      |
Dec 11 10:20:09.891 INFO [stderr]    |                                      help: remove this
Dec 11 10:20:09.891 INFO [stderr] 
Dec 11 10:20:09.980 INFO [stderr] warning: method is never used: `head`
Dec 11 10:20:09.980 INFO [stderr]   --> src/list.rs:24:5
Dec 11 10:20:09.980 INFO [stderr]    |
Dec 11 10:20:09.980 INFO [stderr] 24 |     pub fn head(&self) -> &T {
Dec 11 10:20:09.980 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.980 INFO [stderr]    |
Dec 11 10:20:09.980 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 11 10:20:09.980 INFO [stderr] 
Dec 11 10:20:09.980 INFO [stderr] warning: method is never used: `last`
Dec 11 10:20:09.980 INFO [stderr]   --> src/list.rs:31:5
Dec 11 10:20:09.980 INFO [stderr]    |
Dec 11 10:20:09.980 INFO [stderr] 31 |     pub fn last(&self) -> &T {
Dec 11 10:20:09.980 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.980 INFO [stderr] 
Dec 11 10:20:09.980 INFO [stderr] warning: method is never used: `is_empty`
Dec 11 10:20:09.980 INFO [stderr]   --> src/list.rs:44:5
Dec 11 10:20:09.980 INFO [stderr]    |
Dec 11 10:20:09.980 INFO [stderr] 44 |     fn is_empty(&self) -> bool {
Dec 11 10:20:09.980 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.980 INFO [stderr] 
Dec 11 10:20:09.980 INFO [stderr] warning: function is never used: `tailrec`
Dec 11 10:20:09.980 INFO [stderr]   --> src/list.rs:87:1
Dec 11 10:20:09.980 INFO [stderr]    |
Dec 11 10:20:09.980 INFO [stderr] 87 | fn tailrec<T: Debug>(list: &List<T>) {
Dec 11 10:20:09.980 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 11 10:20:09.980 INFO [stderr] 
Dec 11 10:20:09.980 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.980 INFO [stderr]   --> src/list.rs:27:26
Dec 11 10:20:09.980 INFO [stderr]    |
Dec 11 10:20:09.980 INFO [stderr] 27 |             &List::List {head: ref head, tail: _} => head,
Dec 11 10:20:09.980 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.980 INFO [stderr]    |                          |
Dec 11 10:20:09.980 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.981 INFO [stderr]    |
Dec 11 10:20:09.981 INFO [stderr]    = note: #[warn(non_shorthand_field_patterns)] on by default
Dec 11 10:20:09.981 INFO [stderr] 
Dec 11 10:20:09.981 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.981 INFO [stderr]   --> src/list.rs:34:26
Dec 11 10:20:09.981 INFO [stderr]    |
Dec 11 10:20:09.981 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.981 INFO [stderr]    |                          -----^^^^^^^^^
Dec 11 10:20:09.981 INFO [stderr]    |                          |
Dec 11 10:20:09.981 INFO [stderr]    |                          help: remove this
Dec 11 10:20:09.981 INFO [stderr] 
Dec 11 10:20:09.981 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.981 INFO [stderr]   --> src/list.rs:34:42
Dec 11 10:20:09.981 INFO [stderr]    |
Dec 11 10:20:09.981 INFO [stderr] 34 |             &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.981 INFO [stderr]    |                                          -----^^^^^^^^^
Dec 11 10:20:09.981 INFO [stderr]    |                                          |
Dec 11 10:20:09.981 INFO [stderr]    |                                          help: remove this
Dec 11 10:20:09.981 INFO [stderr] 
Dec 11 10:20:09.981 INFO [stderr] warning: the `head:` in this pattern is redundant
Dec 11 10:20:09.981 INFO [stderr]   --> src/list.rs:90:22
Dec 11 10:20:09.981 INFO [stderr]    |
Dec 11 10:20:09.981 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.981 INFO [stderr]    |                      -----^^^^^^^^^
Dec 11 10:20:09.981 INFO [stderr]    |                      |
Dec 11 10:20:09.981 INFO [stderr]    |                      help: remove this
Dec 11 10:20:09.981 INFO [stderr] 
Dec 11 10:20:09.981 INFO [stderr] warning: the `tail:` in this pattern is redundant
Dec 11 10:20:09.981 INFO [stderr]   --> src/list.rs:90:38
Dec 11 10:20:09.981 INFO [stderr]    |
Dec 11 10:20:09.981 INFO [stderr] 90 |         &List::List {head: ref head, tail: ref tail} => {
Dec 11 10:20:09.981 INFO [stderr]    |                                      -----^^^^^^^^^
Dec 11 10:20:09.981 INFO [stderr]    |                                      |
Dec 11 10:20:09.981 INFO [stderr]    |                                      help: remove this
Dec 11 10:20:09.981 INFO [stderr] 
Dec 11 10:20:09.993 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
Dec 11 10:20:09.996 INFO [stderr] su: No module specific data is present
Dec 11 10:20:10.358 INFO running `"docker" "inspect" "2d9050042247a3d5d187190a8a1ea2f8ce5f32383cb812221251e8d1d1d01063"`
Dec 11 10:20:10.580 INFO running `"docker" "rm" "-f" "2d9050042247a3d5d187190a8a1ea2f8ce5f32383cb812221251e8d1d1d01063"`
Dec 11 10:20:10.762 INFO [stdout] 2d9050042247a3d5d187190a8a1ea2f8ce5f32383cb812221251e8d1d1d01063