[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] d7cf1e7c9bbfa65eb1e700195d570dde5a92d1f4
[INFO] building eoncarlyle/learning-rust against master#44f415c1d617ebc7b931a243b7b321ef8a6ca47c for pr-142134-abi-ast-error
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Feoncarlyle%2Flearning-rust" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/eoncarlyle/learning-rust on toolchain 44f415c1d617ebc7b931a243b7b321ef8a6ca47c
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-6-tc1/source/Cargo.toml
[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" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e61521468e76df6c8ec768060e6bed90b60d46f49a9a597a8acbaf69ae02df3d
[INFO] running `Command { std: "docker" "start" "-a" "e61521468e76df6c8ec768060e6bed90b60d46f49a9a597a8acbaf69ae02df3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e61521468e76df6c8ec768060e6bed90b60d46f49a9a597a8acbaf69ae02df3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e61521468e76df6c8ec768060e6bed90b60d46f49a9a597a8acbaf69ae02df3d", kill_on_drop: false }`
[INFO] [stdout] e61521468e76df6c8ec768060e6bed90b60d46f49a9a597a8acbaf69ae02df3d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e24254cbe1156c4699d8d3da0dbc619bf1777e2aae79dcb0c5ef0ccbb34c85a8
[INFO] running `Command { std: "docker" "start" "-a" "e24254cbe1156c4699d8d3da0dbc619bf1777e2aae79dcb0c5ef0ccbb34c85a8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.171
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling getrandom v0.3.2
[INFO] [stderr]    Compiling zerocopy v0.8.23
[INFO] [stderr]    Compiling autocfg v1.4.0
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling smallvec v1.14.0
[INFO] [stderr]    Compiling lock_api v0.4.12
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling rand_core v0.9.3
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling rand_chacha v0.9.0
[INFO] [stderr]    Compiling rand v0.9.0
[INFO] [stderr]    Compiling learning-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Arc` and `Mutex`
[INFO] [stdout]  --> src/main.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                 ^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/main.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::thread::{self};
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env::VarsOs`
[INFO] [stdout]  --> src/chapter4.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::env::VarsOs;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chapter4.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 let mut buffer = buffer.lock().unwrap();
[INFO] [stdout]    |                     ----^^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_1` is never used
[INFO] [stdout]  --> src/chapter3.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn problem_3_1() {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_3` is never used
[INFO] [stdout]   --> src/chapter3.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn problem_3_3() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_4` is never used
[INFO] [stdout]   --> src/chapter3.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn problem_3_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_6_thread` is never used
[INFO] [stdout]    --> src/chapter3.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn problem_3_6_thread(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_6` is never used
[INFO] [stdout]    --> src/chapter3.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn problem_3_6() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_7_thread` is never used
[INFO] [stdout]    --> src/chapter3.rs:174:4
[INFO] [stdout]     |
[INFO] [stdout] 174 | fn problem_3_7_thread(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_7` is never used
[INFO] [stdout]    --> src/chapter3.rs:209:4
[INFO] [stdout]     |
[INFO] [stdout] 209 | fn problem_3_7() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dancer` is never constructed
[INFO] [stdout]    --> src/chapter3.rs:230:8
[INFO] [stdout]     |
[INFO] [stdout] 230 | struct Dancer {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8_exclusive_thread` is never used
[INFO] [stdout]    --> src/chapter3.rs:235:4
[INFO] [stdout]     |
[INFO] [stdout] 235 | fn problem_3_8_exclusive_thread(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8_exclusive` is never used
[INFO] [stdout]    --> src/chapter3.rs:282:8
[INFO] [stdout]     |
[INFO] [stdout] 282 | pub fn problem_3_8_exclusive() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_1_producer` is never used
[INFO] [stdout]   --> src/chapter4.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn problem_4_1_producer(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_1_consumer` is never used
[INFO] [stdout]   --> src/chapter4.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn problem_4_1_consumer(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_1` is never used
[INFO] [stdout]   --> src/chapter4.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 | pub fn problem_4_1() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ReaderWriterIoState` is never used
[INFO] [stdout]    --> src/chapter4.rs:168:6
[INFO] [stdout]     |
[INFO] [stdout] 168 | enum ReaderWriterIoState {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `ReaderWriterIoState` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ReaderWriterState` is never constructed
[INFO] [stdout]    --> src/chapter4.rs:173:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | struct ReaderWriterState {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_2_reader` is never used
[INFO] [stdout]    --> src/chapter4.rs:180:4
[INFO] [stdout]     |
[INFO] [stdout] 180 | fn problem_4_2_reader(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_2_writer` is never used
[INFO] [stdout]    --> src/chapter4.rs:241:4
[INFO] [stdout]     |
[INFO] [stdout] 241 | fn problem_4_2_writer(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_2` is never used
[INFO] [stdout]    --> src/chapter4.rs:303:8
[INFO] [stdout]     |
[INFO] [stdout] 303 | pub fn problem_4_2() {}
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8_thread` is never used
[INFO] [stdout]  --> src/safety_example.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn problem_3_8_thread(
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8` is never used
[INFO] [stdout]   --> src/safety_example.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn problem_3_8() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]    --> src/chapter4.rs:295:13
[INFO] [stdout]     |
[INFO] [stdout] 295 |             state.lock().unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if unused the Mutex will immediately unlock
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 295 |             let _ = state.lock().unwrap();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.93s
[INFO] running `Command { std: "docker" "inspect" "e24254cbe1156c4699d8d3da0dbc619bf1777e2aae79dcb0c5ef0ccbb34c85a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e24254cbe1156c4699d8d3da0dbc619bf1777e2aae79dcb0c5ef0ccbb34c85a8", kill_on_drop: false }`
[INFO] [stdout] e24254cbe1156c4699d8d3da0dbc619bf1777e2aae79dcb0c5ef0ccbb34c85a8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+44f415c1d617ebc7b931a243b7b321ef8a6ca47c" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 04a7708572e1b8a6dc5fc4eb50c3221b4caa04b9b7d418977e3a1d66ac1dad19
[INFO] running `Command { std: "docker" "start" "-a" "04a7708572e1b8a6dc5fc4eb50c3221b4caa04b9b7d418977e3a1d66ac1dad19", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Arc` and `Mutex`
[INFO] [stdout]  --> src/main.rs:1:17
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::{Arc, Mutex};
[INFO] [stdout]   |                 ^^^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self`
[INFO] [stdout]  --> src/main.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::thread::{self};
[INFO] [stdout]   |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::env::VarsOs`
[INFO] [stdout]  --> src/chapter4.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::env::VarsOs;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/chapter4.rs:58:21
[INFO] [stdout]    |
[INFO] [stdout] 58 |                 let mut buffer = buffer.lock().unwrap();
[INFO] [stdout]    |                     ----^^^^^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_1` is never used
[INFO] [stdout]  --> src/chapter3.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn problem_3_1() {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_3` is never used
[INFO] [stdout]   --> src/chapter3.rs:41:4
[INFO] [stdout]    |
[INFO] [stdout] 41 | fn problem_3_3() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_4` is never used
[INFO] [stdout]   --> src/chapter3.rs:79:4
[INFO] [stdout]    |
[INFO] [stdout] 79 | fn problem_3_4() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_6_thread` is never used
[INFO] [stdout]    --> src/chapter3.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn problem_3_6_thread(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_6` is never used
[INFO] [stdout]    --> src/chapter3.rs:156:4
[INFO] [stdout]     |
[INFO] [stdout] 156 | fn problem_3_6() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_7_thread` is never used
[INFO] [stdout]    --> src/chapter3.rs:174:4
[INFO] [stdout]     |
[INFO] [stdout] 174 | fn problem_3_7_thread(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_7` is never used
[INFO] [stdout]    --> src/chapter3.rs:209:4
[INFO] [stdout]     |
[INFO] [stdout] 209 | fn problem_3_7() {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Dancer` is never constructed
[INFO] [stdout]    --> src/chapter3.rs:230:8
[INFO] [stdout]     |
[INFO] [stdout] 230 | struct Dancer {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8_exclusive_thread` is never used
[INFO] [stdout]    --> src/chapter3.rs:235:4
[INFO] [stdout]     |
[INFO] [stdout] 235 | fn problem_3_8_exclusive_thread(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8_exclusive` is never used
[INFO] [stdout]    --> src/chapter3.rs:282:8
[INFO] [stdout]     |
[INFO] [stdout] 282 | pub fn problem_3_8_exclusive() {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_1_producer` is never used
[INFO] [stdout]   --> src/chapter4.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn problem_4_1_producer(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_1_consumer` is never used
[INFO] [stdout]   --> src/chapter4.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn problem_4_1_consumer(
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_1` is never used
[INFO] [stdout]   --> src/chapter4.rs:69:8
[INFO] [stdout]    |
[INFO] [stdout] 69 | pub fn problem_4_1() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `ReaderWriterIoState` is never used
[INFO] [stdout]    --> src/chapter4.rs:168:6
[INFO] [stdout]     |
[INFO] [stdout] 168 | enum ReaderWriterIoState {
[INFO] [stdout]     |      ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `ReaderWriterIoState` has a derived impl for the trait `Clone`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `ReaderWriterState` is never constructed
[INFO] [stdout]    --> src/chapter4.rs:173:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | struct ReaderWriterState {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_2_reader` is never used
[INFO] [stdout]    --> src/chapter4.rs:180:4
[INFO] [stdout]     |
[INFO] [stdout] 180 | fn problem_4_2_reader(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_2_writer` is never used
[INFO] [stdout]    --> src/chapter4.rs:241:4
[INFO] [stdout]     |
[INFO] [stdout] 241 | fn problem_4_2_writer(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_4_2` is never used
[INFO] [stdout]    --> src/chapter4.rs:303:8
[INFO] [stdout]     |
[INFO] [stdout] 303 | pub fn problem_4_2() {}
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8_thread` is never used
[INFO] [stdout]  --> src/safety_example.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn problem_3_8_thread(
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `problem_3_8` is never used
[INFO] [stdout]   --> src/safety_example.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 | pub fn problem_3_8() {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `MutexGuard` that must be used
[INFO] [stdout]    --> src/chapter4.rs:295:13
[INFO] [stdout]     |
[INFO] [stdout] 295 |             state.lock().unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: if unused the Mutex will immediately unlock
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 295 |             let _ = state.lock().unwrap();
[INFO] [stdout]     |             +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.52s
[INFO] running `Command { std: "docker" "inspect" "04a7708572e1b8a6dc5fc4eb50c3221b4caa04b9b7d418977e3a1d66ac1dad19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04a7708572e1b8a6dc5fc4eb50c3221b4caa04b9b7d418977e3a1d66ac1dad19", kill_on_drop: false }`
[INFO] [stdout] 04a7708572e1b8a6dc5fc4eb50c3221b4caa04b9b7d418977e3a1d66ac1dad19