[INFO] cloning repository https://github.com/eoncarlyle/learning-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/eoncarlyle/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feoncarlyle%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feoncarlyle%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 91432d2e7c26e9044e63872fb756266dd6c51e87
[INFO] checking eoncarlyle/learning-rust against try#ae40d86d689c7b8b0a48c1e4b9d38e02bc2beab1 for pr-145108
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feoncarlyle%2Flearning-rust" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/eoncarlyle/learning-rust
[INFO] finished tweaking git repo https://github.com/eoncarlyle/learning-rust
[INFO] tweaked toml for git repo https://github.com/eoncarlyle/learning-rust written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/eoncarlyle/learning-rust on toolchain ae40d86d689c7b8b0a48c1e4b9d38e02bc2beab1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ae40d86d689c7b8b0a48c1e4b9d38e02bc2beab1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/eoncarlyle/learning-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ae40d86d689c7b8b0a48c1e4b9d38e02bc2beab1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+ae40d86d689c7b8b0a48c1e4b9d38e02bc2beab1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] be044e5ba7b4bad177562a245bbf464558d7d778a0819e50e9bbfc04abd062b9
[INFO] running `Command { std: "docker" "start" "-a" "be044e5ba7b4bad177562a245bbf464558d7d778a0819e50e9bbfc04abd062b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "be044e5ba7b4bad177562a245bbf464558d7d778a0819e50e9bbfc04abd062b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "be044e5ba7b4bad177562a245bbf464558d7d778a0819e50e9bbfc04abd062b9", kill_on_drop: false }`
[INFO] [stdout] be044e5ba7b4bad177562a245bbf464558d7d778a0819e50e9bbfc04abd062b9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/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" "RUSTDOCFLAGS=--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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+ae40d86d689c7b8b0a48c1e4b9d38e02bc2beab1" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4bee22767d502e07a1abee684ccc3af74179c1cc8e933ecb732483761305e1d8
[INFO] running `Command { std: "docker" "start" "-a" "4bee22767d502e07a1abee684ccc3af74179c1cc8e933ecb732483761305e1d8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling zerocopy v0.8.23
[INFO] [stderr]    Compiling getrandom v0.3.2
[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]     Checking smallvec v1.14.0
[INFO] [stderr]     Checking scopeguard v1.2.0
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]     Checking rand_core v0.9.3
[INFO] [stderr]     Checking parking_lot v0.12.3
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]     Checking rand_chacha v0.9.0
[INFO] [stderr]     Checking rand v0.9.0
[INFO] [stderr]     Checking learning-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::u8::MAX`
[INFO] [stdout]  --> src/communal_pot.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::u8::MAX;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::u8::MAX`
[INFO] [stdout]  --> src/communal_pot.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::u8::MAX;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::id`
[INFO] [stdout]  --> src/fifo_barbershop.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::process::id;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process::id`
[INFO] [stdout]  --> src/fifo_barbershop.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::process::id;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicI32` and `AtomicUsize`
[INFO] [stdout]  --> src/fifo_barbershop.rs:5:37
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::atomic::{AtomicBool, AtomicI32, AtomicUsize};
[INFO] [stdout]   |                                     ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `AtomicI32` and `AtomicUsize`
[INFO] [stdout]  --> src/fifo_barbershop.rs:5:37
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::sync::atomic::{AtomicBool, AtomicI32, AtomicUsize};
[INFO] [stdout]   |                                     ^^^^^^^^^  ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `vec`
[INFO] [stdout]  --> src/fifo_barbershop.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::{thread, vec};
[INFO] [stdout]   |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `vec`
[INFO] [stdout]  --> src/fifo_barbershop.rs:9:19
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::{thread, vec};
[INFO] [stdout]   |                   ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/barbershop.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `AgentBools` is never constructed
[INFO] [stdout]  --> src/cigarette_smokers.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct AgentBools {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ConsumerArcs` is never constructed
[INFO] [stdout]   --> src/cigarette_smokers.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct ConsumerArcs {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_5` is never used
[INFO] [stdout]   --> src/cigarette_smokers.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn problem_4_5() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/communal_pot.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]  --> src/barbershop.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 | pub fn run() {
[INFO] [stdout]   |        ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `AgentBools` is never constructed
[INFO] [stdout]  --> src/cigarette_smokers.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct AgentBools {
[INFO] [stdout]   |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ConsumerArcs` is never constructed
[INFO] [stdout]   --> src/cigarette_smokers.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | struct ConsumerArcs {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_5` is never used
[INFO] [stdout]   --> src/cigarette_smokers.rs:20:8
[INFO] [stdout]    |
[INFO] [stdout] 20 | pub fn problem_4_5() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run` is never used
[INFO] [stdout]   --> src/communal_pot.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub fn run() {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/barbershop.rs:87:5
[INFO] [stdout]    |
[INFO] [stdout] 87 |     barber_thread(hair_cut_request, hair_cut_response).join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let _ = barber_thread(hair_cut_request, hair_cut_response).join();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/cigarette_smokers.rs:167:5
[INFO] [stdout]     |
[INFO] [stdout] 167 |     agent_a.join();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 167 |     let _ = agent_a.join();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `array::<impl [T; N]>::map` that must be used
[INFO] [stdout]   --> src/communal_pot.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | /     ["a", "b", "c"].map(|label| {
[INFO] [stdout] 65 | |         diner_thread(
[INFO] [stdout] 66 | |             String::from(label),
[INFO] [stdout] 67 | |             mutex_sem.clone(),
[INFO] [stdout] ...  |
[INFO] [stdout] 70 | |         );
[INFO] [stdout] 71 | |     });
[INFO] [stdout]    | |______^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let _ = ["a", "b", "c"].map(|label| {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/communal_pot.rs:73:5
[INFO] [stdout]    |
[INFO] [stdout] 73 |     cook.join();
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let _ = cook.join();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/fifo_barbershop.rs:110:5
[INFO] [stdout]     |
[INFO] [stdout] 110 |     barber(rx, customer_semaphores, request_mutex).join();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 110 |     let _ = barber(rx, customer_semaphores, request_mutex).join();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/barbershop.rs:87:5
[INFO] [stdout]    |
[INFO] [stdout] 87 |     barber_thread(hair_cut_request, hair_cut_response).join();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 87 |     let _ = barber_thread(hair_cut_request, hair_cut_response).join();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/cigarette_smokers.rs:167:5
[INFO] [stdout]     |
[INFO] [stdout] 167 |     agent_a.join();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 167 |     let _ = agent_a.join();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `array::<impl [T; N]>::map` that must be used
[INFO] [stdout]   --> src/communal_pot.rs:64:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | /     ["a", "b", "c"].map(|label| {
[INFO] [stdout] 65 | |         diner_thread(
[INFO] [stdout] 66 | |             String::from(label),
[INFO] [stdout] 67 | |             mutex_sem.clone(),
[INFO] [stdout] ...  |
[INFO] [stdout] 70 | |         );
[INFO] [stdout] 71 | |     });
[INFO] [stdout]    | |______^
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 64 |     let _ = ["a", "b", "c"].map(|label| {
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/communal_pot.rs:73:5
[INFO] [stdout]    |
[INFO] [stdout] 73 |     cook.join();
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 73 |     let _ = cook.join();
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/fifo_barbershop.rs:110:5
[INFO] [stdout]     |
[INFO] [stdout] 110 |     barber(rx, customer_semaphores, request_mutex).join();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 110 |     let _ = barber(rx, customer_semaphores, request_mutex).join();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.26s
[INFO] running `Command { std: "docker" "inspect" "4bee22767d502e07a1abee684ccc3af74179c1cc8e933ecb732483761305e1d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bee22767d502e07a1abee684ccc3af74179c1cc8e933ecb732483761305e1d8", kill_on_drop: false }`
[INFO] [stdout] 4bee22767d502e07a1abee684ccc3af74179c1cc8e933ecb732483761305e1d8