[INFO] cloning repository https://github.com/amryamanah/workspace-tutor
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/amryamanah/workspace-tutor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famryamanah%2Fworkspace-tutor", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famryamanah%2Fworkspace-tutor'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a113af6a664c55d6cbdc479ef6cdf3eaedb1688f
[INFO] checking amryamanah/workspace-tutor against try#b20a093d9fb1ffaa04ae9852cb034864a992bafd for pr-85073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Famryamanah%2Fworkspace-tutor" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/amryamanah/workspace-tutor on toolchain b20a093d9fb1ffaa04ae9852cb034864a992bafd
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/amryamanah/workspace-tutor
[INFO] finished tweaking git repo https://github.com/amryamanah/workspace-tutor
[INFO] tweaked toml for git repo https://github.com/amryamanah/workspace-tutor written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/amryamanah/workspace-tutor already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8d398686ceec51791561afa89ca6cc07873463c4ef4bc4795586f8b0d62d4c19
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8d398686ceec51791561afa89ca6cc07873463c4ef4bc4795586f8b0d62d4c19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d398686ceec51791561afa89ca6cc07873463c4ef4bc4795586f8b0d62d4c19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d398686ceec51791561afa89ca6cc07873463c4ef4bc4795586f8b0d62d4c19", kill_on_drop: false }`
[INFO] [stdout] 8d398686ceec51791561afa89ca6cc07873463c4ef4bc4795586f8b0d62d4c19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+b20a093d9fb1ffaa04ae9852cb034864a992bafd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e7a77e78cd90ba34eadb5bfb85db38d11bd41ffc3d5508f2b42f2c90e14a0bf7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e7a77e78cd90ba34eadb5bfb85db38d11bd41ffc3d5508f2b42f2c90e14a0bf7", kill_on_drop: false }`
[INFO] [stderr]     Checking chap17_oop v0.1.0 (/opt/rustwide/workdir/chap17_oop)
[INFO] [stderr]     Checking blog v0.1.0 (/opt/rustwide/workdir/blog)
[INFO] [stderr]     Checking chap15_smart_pointer v0.1.0 (/opt/rustwide/workdir/chap15_smart_pointer)
[INFO] [stderr]     Checking chap19_advanced v0.1.0 (/opt/rustwide/workdir/chap19_advanced)
[INFO] [stderr]     Checking chap16_concurrency v0.1.0 (/opt/rustwide/workdir/chap16_concurrency)
[INFO] [stderr]     Checking chap18_pattern v0.1.0 (/opt/rustwide/workdir/chap18_pattern)
[INFO] [stderr]     Checking chap20_webserver v0.1.0 (/opt/rustwide/workdir/chap20_webserver)
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> blog/src/postv1.rs:38:27
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:23:45
[INFO] [stdout]    |
[INFO] [stdout] 23 |         Message::Hello { id: id_variable @ 3...7 } => {
[INFO] [stdout]    |                                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:26:32
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Message::Hello { id: 10...12 } => {
[INFO] [stdout]    |                                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:23:45
[INFO] [stdout]    |
[INFO] [stdout] 23 |         Message::Hello { id: id_variable @ 3...7 } => {
[INFO] [stdout]    |                                             ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:26:32
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Message::Hello { id: 10...12 } => {
[INFO] [stdout]    |                                ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `post`
[INFO] [stdout]   --> blog/src/postv1.rs:38:27
[INFO] [stdout]    |
[INFO] [stdout] 38 |     fn content<'a>(&self, post: &'a Post) -> &'a str {
[INFO] [stdout]    |                           ^^^^ help: if this is intentional, prefix it with an underscore: `_post`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `workers`
[INFO] [stdout]   --> chap20_webserver/src/multithreaded.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     workers: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> chap20_webserver/src/multithreaded.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 |     id: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `thread`
[INFO] [stdout]   --> chap20_webserver/src/multithreaded.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> chap15_smart_pointer/src/lib.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 |     let b = RcCons(3, Rc::clone(&a));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> chap15_smart_pointer/src/lib.rs:157:13
[INFO] [stdout]     |
[INFO] [stdout] 157 |         let c = RcCons(4, Rc::clone(&a));
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `workers`
[INFO] [stdout]   --> chap20_webserver/src/multithreaded.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 |     workers: Vec<Worker>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |         y: i32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `z`
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |         z: i32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> chap18_pattern/src/lib.rs:115:5
[INFO] [stdout]     |
[INFO] [stdout] 115 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> chap18_pattern/src/lib.rs:116:5
[INFO] [stdout]     |
[INFO] [stdout] 116 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> chap18_pattern/src/lib.rs:117:5
[INFO] [stdout]     |
[INFO] [stdout] 117 |     Write(String),
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> chap15_smart_pointer/src/lib.rs:154:9
[INFO] [stdout]     |
[INFO] [stdout] 154 |     let b = RcCons(3, Rc::clone(&a));
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]    --> chap15_smart_pointer/src/lib.rs:157:13
[INFO] [stdout]     |
[INFO] [stdout] 157 |         let c = RcCons(4, Rc::clone(&a));
[INFO] [stdout]     |             ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |         y: i32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `id`
[INFO] [stdout]   --> chap20_webserver/src/multithreaded.rs:62:5
[INFO] [stdout]    |
[INFO] [stdout] 62 |     id: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `thread`
[INFO] [stdout]   --> chap20_webserver/src/multithreaded.rs:63:5
[INFO] [stdout]    |
[INFO] [stdout] 63 |     thread: thread::JoinHandle<()>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `z`
[INFO] [stdout]   --> chap18_pattern/src/lib.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |         z: i32,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Quit`
[INFO] [stdout]    --> chap18_pattern/src/lib.rs:115:5
[INFO] [stdout]     |
[INFO] [stdout] 115 |     Quit,
[INFO] [stdout]     |     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Move`
[INFO] [stdout]    --> chap18_pattern/src/lib.rs:116:5
[INFO] [stdout]     |
[INFO] [stdout] 116 |     Move { x: i32, y: i32 },
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Write`
[INFO] [stdout]    --> chap18_pattern/src/lib.rs:117:5
[INFO] [stdout]     |
[INFO] [stdout] 117 |     Write(String),
[INFO] [stdout]     |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking main_tutor v0.1.0 (/opt/rustwide/workdir/main_tutor)
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.69s
[INFO] running `Command { std: "docker" "inspect" "e7a77e78cd90ba34eadb5bfb85db38d11bd41ffc3d5508f2b42f2c90e14a0bf7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7a77e78cd90ba34eadb5bfb85db38d11bd41ffc3d5508f2b42f2c90e14a0bf7", kill_on_drop: false }`
[INFO] [stdout] e7a77e78cd90ba34eadb5bfb85db38d11bd41ffc3d5508f2b42f2c90e14a0bf7