[INFO] cloning repository https://github.com/lochon/learn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lochon/learn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flochon%2Flearn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flochon%2Flearn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 68a82fce990c5d36920910a214ea73e0f1e16e11
[INFO] testing lochon/learn against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flochon%2Flearn" "/workspace/builds/worker-45/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-45/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lochon/learn on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/lochon/learn
[INFO] finished tweaking git repo https://github.com/lochon/learn
[INFO] tweaked toml for git repo https://github.com/lochon/learn written to /workspace/builds/worker-45/source/Cargo.toml
[INFO] crate git repo https://github.com/lochon/learn already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 473c6426cf608d3ae5491a373b877b337d03c03935c78cae38997bce1a1ce3b3
[INFO] running `Command { std: "docker" "start" "-a" "473c6426cf608d3ae5491a373b877b337d03c03935c78cae38997bce1a1ce3b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "473c6426cf608d3ae5491a373b877b337d03c03935c78cae38997bce1a1ce3b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "473c6426cf608d3ae5491a373b877b337d03c03935c78cae38997bce1a1ce3b3", kill_on_drop: false }`
[INFO] [stdout] 473c6426cf608d3ae5491a373b877b337d03c03935c78cae38997bce1a1ce3b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] de2542470518c12957f1bec4b3c4d5be87e78564249191dfb7014a1838ec98ba
[INFO] running `Command { std: "docker" "start" "-a" "de2542470518c12957f1bec4b3c4d5be87e78564249191dfb7014a1838ec98ba", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.79
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling ppv-lite86 v0.2.9
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `common_programming_concepts::variables::*`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use common_programming_concepts::variables::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common_programming_concepts::data_types::*`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use common_programming_concepts::data_types::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common_programming_concepts::functions_work`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use common_programming_concepts::functions_work;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common_programming_concepts::functions_work::func_parameters`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use crate::common_programming_concepts::functions_work::func_parameters;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `HEARTBEAT_127`
[INFO] [stdout]  --> src/common_programming_concepts.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub const HEARTBEAT_127: i8 = 127;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `var`
[INFO] [stdout]  --> src/common_programming_concepts.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 |     pub fn var() {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadowing`
[INFO] [stdout]   --> src/common_programming_concepts.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn shadowing() {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `this_is_function`
[INFO] [stdout]    --> src/common_programming_concepts.rs:149:13
[INFO] [stdout]     |
[INFO] [stdout] 149 |     pub  fn this_is_function(){
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `func_parameters`
[INFO] [stdout]    --> src/common_programming_concepts.rs:152:12
[INFO] [stdout]     |
[INFO] [stdout] 152 |     pub fn func_parameters(x: i32, y: i32) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `statements_expressions`
[INFO] [stdout]    --> src/common_programming_concepts.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub fn statements_expressions(){
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_value`
[INFO] [stdout]    --> src/common_programming_concepts.rs:190:12
[INFO] [stdout]     |
[INFO] [stdout] 190 |     pub fn return_value() -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 23s
[INFO] running `Command { std: "docker" "inspect" "de2542470518c12957f1bec4b3c4d5be87e78564249191dfb7014a1838ec98ba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "de2542470518c12957f1bec4b3c4d5be87e78564249191dfb7014a1838ec98ba", kill_on_drop: false }`
[INFO] [stdout] de2542470518c12957f1bec4b3c4d5be87e78564249191dfb7014a1838ec98ba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b25a46c5570eb4106c6f1d87ed618b869182914eebb21b3a3323896c4b0a6bbd
[INFO] running `Command { std: "docker" "start" "-a" "b25a46c5570eb4106c6f1d87ed618b869182914eebb21b3a3323896c4b0a6bbd", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling learn v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `common_programming_concepts::variables::*`
[INFO] [stdout]  --> src/main.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use common_programming_concepts::variables::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common_programming_concepts::data_types::*`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use common_programming_concepts::data_types::*;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `common_programming_concepts::functions_work`
[INFO] [stdout]  --> src/main.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 | use common_programming_concepts::functions_work;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::common_programming_concepts::functions_work::func_parameters`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use crate::common_programming_concepts::functions_work::func_parameters;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `HEARTBEAT_127`
[INFO] [stdout]  --> src/common_programming_concepts.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 |     pub const HEARTBEAT_127: i8 = 127;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `var`
[INFO] [stdout]  --> src/common_programming_concepts.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 |     pub fn var() {
[INFO] [stdout]   |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `shadowing`
[INFO] [stdout]   --> src/common_programming_concepts.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 |     pub fn shadowing() {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `this_is_function`
[INFO] [stdout]    --> src/common_programming_concepts.rs:149:13
[INFO] [stdout]     |
[INFO] [stdout] 149 |     pub  fn this_is_function(){
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `func_parameters`
[INFO] [stdout]    --> src/common_programming_concepts.rs:152:12
[INFO] [stdout]     |
[INFO] [stdout] 152 |     pub fn func_parameters(x: i32, y: i32) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `statements_expressions`
[INFO] [stdout]    --> src/common_programming_concepts.rs:166:12
[INFO] [stdout]     |
[INFO] [stdout] 166 |     pub fn statements_expressions(){
[INFO] [stdout]     |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_value`
[INFO] [stdout]    --> src/common_programming_concepts.rs:190:12
[INFO] [stdout]     |
[INFO] [stdout] 190 |     pub fn return_value() -> i32 {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 11 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `Command { std: "docker" "inspect" "b25a46c5570eb4106c6f1d87ed618b869182914eebb21b3a3323896c4b0a6bbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b25a46c5570eb4106c6f1d87ed618b869182914eebb21b3a3323896c4b0a6bbd", kill_on_drop: false }`
[INFO] [stdout] b25a46c5570eb4106c6f1d87ed618b869182914eebb21b3a3323896c4b0a6bbd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-45/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 03af94da3fe5a74ed928a631b79536ffc28a692b3ba535bf60cf3bae5d462cc3
[INFO] running `Command { std: "docker" "start" "-a" "03af94da3fe5a74ed928a631b79536ffc28a692b3ba535bf60cf3bae5d462cc3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused import: `common_programming_concepts::variables::*`
[INFO] [stderr]  --> src/main.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use common_programming_concepts::variables::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `common_programming_concepts::data_types::*`
[INFO] [stderr]  --> src/main.rs:6:5
[INFO] [stderr]   |
[INFO] [stderr] 6 | use common_programming_concepts::data_types::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `common_programming_concepts::functions_work`
[INFO] [stderr]  --> src/main.rs:7:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | use common_programming_concepts::functions_work;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::common_programming_concepts::functions_work::func_parameters`
[INFO] [stderr]  --> src/main.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 | use crate::common_programming_concepts::functions_work::func_parameters;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant is never used: `HEARTBEAT_127`
[INFO] [stderr]  --> src/common_programming_concepts.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 |     pub const HEARTBEAT_127: i8 = 127;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `var`
[INFO] [stderr]  --> src/common_programming_concepts.rs:5:12
[INFO] [stderr]   |
[INFO] [stderr] 5 |     pub fn var() {
[INFO] [stderr]   |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `shadowing`
[INFO] [stderr]   --> src/common_programming_concepts.rs:18:12
[INFO] [stderr]    |
[INFO] [stderr] 18 |     pub fn shadowing() {
[INFO] [stderr]    |            ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `this_is_function`
[INFO] [stderr]    --> src/common_programming_concepts.rs:149:13
[INFO] [stderr]     |
[INFO] [stderr] 149 |     pub  fn this_is_function(){
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `func_parameters`
[INFO] [stderr]    --> src/common_programming_concepts.rs:152:12
[INFO] [stderr]     |
[INFO] [stderr] 152 |     pub fn func_parameters(x: i32, y: i32) {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `statements_expressions`
[INFO] [stderr]    --> src/common_programming_concepts.rs:166:12
[INFO] [stderr]     |
[INFO] [stderr] 166 |     pub fn statements_expressions(){
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `return_value`
[INFO] [stderr]    --> src/common_programming_concepts.rs:190:12
[INFO] [stderr]     |
[INFO] [stderr] 190 |     pub fn return_value() -> i32 {
[INFO] [stderr]     |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `learn` (bin "learn" test) generated 11 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.52s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/learn-ff8af622b530af98)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "03af94da3fe5a74ed928a631b79536ffc28a692b3ba535bf60cf3bae5d462cc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03af94da3fe5a74ed928a631b79536ffc28a692b3ba535bf60cf3bae5d462cc3", kill_on_drop: false }`
[INFO] [stdout] 03af94da3fe5a74ed928a631b79536ffc28a692b3ba535bf60cf3bae5d462cc3