[INFO] cloning repository https://github.com/darwins-challenge/moonlander-ast-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/darwins-challenge/moonlander-ast-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdarwins-challenge%2Fmoonlander-ast-rust"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdarwins-challenge%2Fmoonlander-ast-rust'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ea69bee6ca7132db6b057df2a46fff2438c089d3
[INFO] testing darwins-challenge/moonlander-ast-rust against 1.44.0 for beta-1.45-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdarwins-challenge%2Fmoonlander-ast-rust" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/darwins-challenge/moonlander-ast-rust on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/darwins-challenge/moonlander-ast-rust
[INFO] finished tweaking git repo https://github.com/darwins-challenge/moonlander-ast-rust
[INFO] tweaked toml for git repo https://github.com/darwins-challenge/moonlander-ast-rust written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/darwins-challenge/moonlander-ast-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /workspace/builds/worker-4/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 39bc9ff3585990768aefa203a67a365688711b0d03027b09e341c47d49e97073
[INFO] running `"docker" "start" "-a" "39bc9ff3585990768aefa203a67a365688711b0d03027b09e341c47d49e97073"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling regex v1.3.9
[INFO] [stderr]    Compiling env_logger v0.7.1
[INFO] [stderr]    Compiling ast v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:38:23
[INFO] [stderr]    |
[INFO] [stderr] 38 |         let encoded = try!(json::encode(&self.states));
[INFO] [stderr]    |                       ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |         try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:44:21
[INFO] [stderr]    |
[INFO] [stderr] 44 |         let mut f = try!(File::create(path));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:54:19
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let encoded = try!(json::encode(&x));
[INFO] [stderr]    |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 55 |     try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     try!(w.write(&[10]));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     try!(w.write_all(&program.source().as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:78:19
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let encoded = try!(json::encode(&score));
[INFO] [stderr]    |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:79:5
[INFO] [stderr]    |
[INFO] [stderr] 79 |     try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:16:29
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn copy(&self, copier: &Copier) -> Self;
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:20:29
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:26:29
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:32:29
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:38:29
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:44:29
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:123:26
[INFO] [stderr]     |
[INFO] [stderr] 123 | fn copy_program(copier: &Copier, program: &Program) -> Program {
[INFO] [stderr]     |                          ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:130:29
[INFO] [stderr]     |
[INFO] [stderr] 130 | fn copy_expression(copier: &Copier, expression: &Expression) -> Expression {
[INFO] [stderr]     |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:141:28
[INFO] [stderr]     |
[INFO] [stderr] 141 | fn copy_condition(copier: &Copier, condition: &Condition) -> Condition {
[INFO] [stderr]     |                            ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:155:20
[INFO] [stderr]     |
[INFO] [stderr] 155 | fn copy_sensor(_: &Copier, sensor: &Sensor) -> Sensor {
[INFO] [stderr]     |                    ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:159:21
[INFO] [stderr]     |
[INFO] [stderr] 159 | fn copy_command(_: &Copier, command: &Command) -> Command {
[INFO] [stderr]     |                     ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:37:32
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn save(&self, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:37:57
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn save(&self, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                         ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:43:60
[INFO] [stderr]    |
[INFO] [stderr] 43 |     pub fn save_file(&self, path: &Path) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:53:45
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn writeln<T: Encodable>(x: &T, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                             ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:53:70
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn writeln<T: Encodable>(x: &T, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                      ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:66:52
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn save_source<P: Source>(program: &P, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:66:77
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn save_source<P: Source>(program: &P, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                             ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:72:80
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn save_source_file<P: Source>(path: &Path, program: &P) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:77:43
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn save_score(score: &Scores, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                           ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:77:68
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn save_score(score: &Scores, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                    ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn visit(&'a self, visitor: &mut Visitor<'a>);
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:24:35
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:35:35
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:53:35
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:59:35
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:74:35
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: 37 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.05s
[INFO] running `"docker" "inspect" "39bc9ff3585990768aefa203a67a365688711b0d03027b09e341c47d49e97073"`
[INFO] running `"docker" "rm" "-f" "39bc9ff3585990768aefa203a67a365688711b0d03027b09e341c47d49e97073"`
[INFO] [stdout] 39bc9ff3585990768aefa203a67a365688711b0d03027b09e341c47d49e97073
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7bcace1dd070b90931b88d96d51f2ef1604740062ad3cfcfcb3aa900529de2c9
[INFO] running `"docker" "start" "-a" "7bcace1dd070b90931b88d96d51f2ef1604740062ad3cfcfcb3aa900529de2c9"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling ast v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:38:23
[INFO] [stderr]    |
[INFO] [stderr] 38 |         let encoded = try!(json::encode(&self.states));
[INFO] [stderr]    |                       ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |         try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:44:21
[INFO] [stderr]    |
[INFO] [stderr] 44 |         let mut f = try!(File::create(path));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:54:19
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let encoded = try!(json::encode(&x));
[INFO] [stderr]    |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 55 |     try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     try!(w.write(&[10]));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     try!(w.write_all(&program.source().as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:78:19
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let encoded = try!(json::encode(&score));
[INFO] [stderr]    |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:79:5
[INFO] [stderr]    |
[INFO] [stderr] 79 |     try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:16:29
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn copy(&self, copier: &Copier) -> Self;
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:20:29
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:26:29
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:32:29
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:38:29
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:44:29
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:123:26
[INFO] [stderr]     |
[INFO] [stderr] 123 | fn copy_program(copier: &Copier, program: &Program) -> Program {
[INFO] [stderr]     |                          ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:130:29
[INFO] [stderr]     |
[INFO] [stderr] 130 | fn copy_expression(copier: &Copier, expression: &Expression) -> Expression {
[INFO] [stderr]     |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:141:28
[INFO] [stderr]     |
[INFO] [stderr] 141 | fn copy_condition(copier: &Copier, condition: &Condition) -> Condition {
[INFO] [stderr]     |                            ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:155:20
[INFO] [stderr]     |
[INFO] [stderr] 155 | fn copy_sensor(_: &Copier, sensor: &Sensor) -> Sensor {
[INFO] [stderr]     |                    ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:159:21
[INFO] [stderr]     |
[INFO] [stderr] 159 | fn copy_command(_: &Copier, command: &Command) -> Command {
[INFO] [stderr]     |                     ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:37:32
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn save(&self, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:37:57
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn save(&self, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                         ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:43:60
[INFO] [stderr]    |
[INFO] [stderr] 43 |     pub fn save_file(&self, path: &Path) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:53:45
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn writeln<T: Encodable>(x: &T, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                             ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:53:70
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn writeln<T: Encodable>(x: &T, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                      ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:66:52
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn save_source<P: Source>(program: &P, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:66:77
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn save_source<P: Source>(program: &P, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                             ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:72:80
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn save_source_file<P: Source>(path: &Path, program: &P) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:77:43
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn save_score(score: &Scores, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                           ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:77:68
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn save_score(score: &Scores, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                    ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn visit(&'a self, visitor: &mut Visitor<'a>);
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:24:35
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:35:35
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:53:35
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:59:35
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:74:35
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: 37 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused `#[macro_use]` import
[INFO] [stderr]  --> examples/generate.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #[macro_use]
[INFO] [stderr]   | ^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::stdout`
[INFO] [stderr]  --> examples/simple-evolve.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use std::io::stdout;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused imports: `partial_max`, `partial_min`
[INFO] [stderr]   --> examples/simple-evolve.rs:18:24
[INFO] [stderr]    |
[INFO] [stderr] 18 | use ast::num::{square, partial_max, partial_min};
[INFO] [stderr]    |                        ^^^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> examples/json_decode.rs:17:61
[INFO] [stderr]    |
[INFO] [stderr] 17 |         Err(why) => panic!("couldn't open {}: {}", display, Error::description(&why)),
[INFO] [stderr]    |                                                             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
[INFO] [stderr]   --> examples/json_decode.rs:23:61
[INFO] [stderr]    |
[INFO] [stderr] 23 |         Err(why) => panic!("couldn't read {}: {}", display, Error::description(&why)),
[INFO] [stderr]    |                                                             ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:38:23
[INFO] [stderr]    |
[INFO] [stderr] 38 |         let encoded = try!(json::encode(&self.states));
[INFO] [stderr]    |                       ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:39:9
[INFO] [stderr]    |
[INFO] [stderr] 39 |         try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |         ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:44:21
[INFO] [stderr]    |
[INFO] [stderr] 44 |         let mut f = try!(File::create(path));
[INFO] [stderr]    |                     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:54:19
[INFO] [stderr]    |
[INFO] [stderr] 54 |     let encoded = try!(json::encode(&x));
[INFO] [stderr]    |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:55:5
[INFO] [stderr]    |
[INFO] [stderr] 55 |     try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:56:5
[INFO] [stderr]    |
[INFO] [stderr] 56 |     try!(w.write(&[10]));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     try!(w.write_all(&program.source().as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:73:17
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut f = try!(File::create(path));
[INFO] [stderr]    |                 ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:78:19
[INFO] [stderr]    |
[INFO] [stderr] 78 |     let encoded = try!(json::encode(&score));
[INFO] [stderr]    |                   ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'try': use the `?` operator instead
[INFO] [stderr]   --> src/serialize.rs:79:5
[INFO] [stderr]    |
[INFO] [stderr] 79 |     try!(w.write_all(&encoded.as_bytes()));
[INFO] [stderr]    |     ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:16:29
[INFO] [stderr]    |
[INFO] [stderr] 16 |     fn copy(&self, copier: &Copier) -> Self;
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:20:29
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:26:29
[INFO] [stderr]    |
[INFO] [stderr] 26 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:32:29
[INFO] [stderr]    |
[INFO] [stderr] 32 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:38:29
[INFO] [stderr]    |
[INFO] [stderr] 38 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/copy.rs:44:29
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn copy(&self, copier: &Copier) -> Self {
[INFO] [stderr]    |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:123:26
[INFO] [stderr]     |
[INFO] [stderr] 123 | fn copy_program(copier: &Copier, program: &Program) -> Program {
[INFO] [stderr]     |                          ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:130:29
[INFO] [stderr]     |
[INFO] [stderr] 130 | fn copy_expression(copier: &Copier, expression: &Expression) -> Expression {
[INFO] [stderr]     |                             ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:141:28
[INFO] [stderr]     |
[INFO] [stderr] 141 | fn copy_condition(copier: &Copier, condition: &Condition) -> Condition {
[INFO] [stderr]     |                            ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:155:20
[INFO] [stderr]     |
[INFO] [stderr] 155 | fn copy_sensor(_: &Copier, sensor: &Sensor) -> Sensor {
[INFO] [stderr]     |                    ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/copy.rs:159:21
[INFO] [stderr]     |
[INFO] [stderr] 159 | fn copy_command(_: &Copier, command: &Command) -> Command {
[INFO] [stderr]     |                     ^^^^^^ help: use `dyn`: `dyn Copier`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:37:32
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn save(&self, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:37:57
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn save(&self, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                         ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:43:60
[INFO] [stderr]    |
[INFO] [stderr] 43 |     pub fn save_file(&self, path: &Path) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                            ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:53:45
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn writeln<T: Encodable>(x: &T, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                             ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:53:70
[INFO] [stderr]    |
[INFO] [stderr] 53 | pub fn writeln<T: Encodable>(x: &T, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                      ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:66:52
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn save_source<P: Source>(program: &P, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                    ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:66:77
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn save_source<P: Source>(program: &P, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                             ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:72:80
[INFO] [stderr]    |
[INFO] [stderr] 72 | pub fn save_source_file<P: Source>(path: &Path, program: &P) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:77:43
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn save_score(score: &Scores, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                           ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/serialize.rs:77:68
[INFO] [stderr]    |
[INFO] [stderr] 77 | pub fn save_score(score: &Scores, w: &mut Write) -> Result<(), Box<Error>> {
[INFO] [stderr]    |                                                                    ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:20:38
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn visit(&'a self, visitor: &mut Visitor<'a>);
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:24:35
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:35:35
[INFO] [stderr]    |
[INFO] [stderr] 35 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:53:35
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:59:35
[INFO] [stderr]    |
[INFO] [stderr] 59 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/visit.rs:74:35
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn visit(&'a self, visitor: &mut Visitor<'a>) {
[INFO] [stderr]    |                                      ^^^^^^^^^^^ help: use `dyn`: `dyn Visitor<'a>`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `expect` found for unit type `()` in the current scope
[INFO] [stderr]   --> examples/simple-evolve.rs:96:24
[INFO] [stderr]    |
[INFO] [stderr] 96 |     env_logger::init().expect("Error initializing logger");
[INFO] [stderr]    |                        ^^^^^^ method not found in `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: could not compile `ast`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 37 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "7bcace1dd070b90931b88d96d51f2ef1604740062ad3cfcfcb3aa900529de2c9"`
[INFO] running `"docker" "rm" "-f" "7bcace1dd070b90931b88d96d51f2ef1604740062ad3cfcfcb3aa900529de2c9"`
[INFO] [stdout] 7bcace1dd070b90931b88d96d51f2ef1604740062ad3cfcfcb3aa900529de2c9