[INFO] cloning repository https://github.com/andreisilviudragnea/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/andreisilviudragnea/learning-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandreisilviudragnea%2Flearning-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandreisilviudragnea%2Flearning-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2526da14b24e69a7c4d1b2262ed8904baa83f096
[INFO] testing andreisilviudragnea/learning-rust/2526da14b24e69a7c4d1b2262ed8904baa83f096 against nightly-2024-10-28 for randomize-layout
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandreisilviudragnea%2Flearning-rust" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/andreisilviudragnea/learning-rust on toolchain nightly-2024-10-28
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+nightly-2024-10-28" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/andreisilviudragnea/learning-rust
[INFO] finished tweaking git repo https://github.com/andreisilviudragnea/learning-rust
[INFO] tweaked toml for git repo https://github.com/andreisilviudragnea/learning-rust written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/andreisilviudragnea/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" "+nightly-2024-10-28" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-10-28" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 376c5360d8d84193068ac86fe3208f46987c8686782750288394d59115cdad93
[INFO] running `Command { std: "docker" "start" "-a" "376c5360d8d84193068ac86fe3208f46987c8686782750288394d59115cdad93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "376c5360d8d84193068ac86fe3208f46987c8686782750288394d59115cdad93", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "376c5360d8d84193068ac86fe3208f46987c8686782750288394d59115cdad93", kill_on_drop: false }`
[INFO] [stdout] 376c5360d8d84193068ac86fe3208f46987c8686782750288394d59115cdad93
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-10-28" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c435bd75cd153f36e2ce8d009a945637c95c16257d632ad42c654f9d88dd1d58
[INFO] running `Command { std: "docker" "start" "-a" "c435bd75cd153f36e2ce8d009a945637c95c16257d632ad42c654f9d88dd1d58", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling libc v0.2.150
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling futures-core v0.3.31
[INFO] [stderr]    Compiling pin-project-lite v0.2.12
[INFO] [stderr]    Compiling parking_lot_core v0.9.7
[INFO] [stderr]    Compiling futures-sink v0.3.31
[INFO] [stderr]    Compiling futures-io v0.3.31
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling futures-channel v0.3.31
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling smallvec v1.10.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling bytes v1.4.0
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]    Compiling lock_api v0.4.9
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.79
[INFO] [stderr]    Compiling socket2 v0.5.5
[INFO] [stderr]    Compiling signal-hook-registry v1.4.1
[INFO] [stderr]    Compiling mio v1.0.1
[INFO] [stderr]    Compiling parking_lot v0.12.1
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]    Compiling tokio-macros v2.4.0
[INFO] [stderr]    Compiling tokio v1.41.0
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling futures-executor v0.3.31
[INFO] [stderr]    Compiling futures v0.3.31
[INFO] [stderr]    Compiling learning-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `option_function_first_none_no_return` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn option_function_first_none_no_return(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_none_no_return_after_fix` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn option_function_first_none_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_return` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn option_function_first_some_no_return(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_return_after_fix` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn option_function_first_some_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_match_components_no_return` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 | pub fn option_function_first_some_no_match_components_no_return(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_match_components_no_return_after_fix` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | pub fn option_function_first_some_no_match_components_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused logical operation that must be used
[INFO] [stdout]   --> src/scope.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | /         *t1 && {
[INFO] [stdout] 14 | |             let t2 = x.borrow_mut();
[INFO] [stdout] 15 | |             *t2
[INFO] [stdout] 16 | |         }
[INFO] [stdout]    | |_________^ the logical operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 13 ~         let _ = *t1 && {
[INFO] [stdout] 14 |             let t2 = x.borrow_mut();
[INFO] [stdout] 15 |             *t2
[INFO] [stdout] 16 ~         };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.70s
[INFO] running `Command { std: "docker" "inspect" "c435bd75cd153f36e2ce8d009a945637c95c16257d632ad42c654f9d88dd1d58", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c435bd75cd153f36e2ce8d009a945637c95c16257d632ad42c654f9d88dd1d58", kill_on_drop: false }`
[INFO] [stdout] c435bd75cd153f36e2ce8d009a945637c95c16257d632ad42c654f9d88dd1d58
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-10-28" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 533dffa6fe7b0ea189b945fae43ac3a435ed2c7a1decda18cca7b72fd0946f2e
[INFO] running `Command { std: "docker" "start" "-a" "533dffa6fe7b0ea189b945fae43ac3a435ed2c7a1decda18cca7b72fd0946f2e", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `option_function_first_none_no_return` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub fn option_function_first_none_no_return(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_none_no_return_after_fix` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub fn option_function_first_none_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_return` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 | pub fn option_function_first_some_no_return(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_return_after_fix` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:46:8
[INFO] [stdout]    |
[INFO] [stdout] 46 | pub fn option_function_first_some_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_match_components_no_return` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:66:8
[INFO] [stdout]    |
[INFO] [stdout] 66 | pub fn option_function_first_some_no_match_components_no_return(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `option_function_first_some_no_match_components_no_return_after_fix` is never used
[INFO] [stdout]   --> src/clippy/question_mark.rs:73:8
[INFO] [stdout]    |
[INFO] [stdout] 73 | pub fn option_function_first_some_no_match_components_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused logical operation that must be used
[INFO] [stdout]   --> src/scope.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | /         *t1 && {
[INFO] [stdout] 14 | |             let t2 = x.borrow_mut();
[INFO] [stdout] 15 | |             *t2
[INFO] [stdout] 16 | |         }
[INFO] [stdout]    | |_________^ the logical operation produces a value
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 13 ~         let _ = *t1 && {
[INFO] [stdout] 14 |             let t2 = x.borrow_mut();
[INFO] [stdout] 15 |             *t2
[INFO] [stdout] 16 ~         };
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "533dffa6fe7b0ea189b945fae43ac3a435ed2c7a1decda18cca7b72fd0946f2e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "533dffa6fe7b0ea189b945fae43ac3a435ed2c7a1decda18cca7b72fd0946f2e", kill_on_drop: false }`
[INFO] [stdout] 533dffa6fe7b0ea189b945fae43ac3a435ed2c7a1decda18cca7b72fd0946f2e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+nightly-2024-10-28" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 12adfa392a7a1e34519f52a232e4b8f8d791a3f7a0f9583a1742a1df8df8cf81
[INFO] running `Command { std: "docker" "start" "-a" "12adfa392a7a1e34519f52a232e4b8f8d791a3f7a0f9583a1742a1df8df8cf81", kill_on_drop: false }`
[INFO] [stderr] warning: function `option_function_first_none_no_return` is never used
[INFO] [stderr]   --> src/clippy/question_mark.rs:14:8
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub fn option_function_first_none_no_return(input: Option<String>) -> Option<String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `option_function_first_none_no_return_after_fix` is never used
[INFO] [stderr]   --> src/clippy/question_mark.rs:21:8
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub fn option_function_first_none_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `option_function_first_some_no_return` is never used
[INFO] [stderr]   --> src/clippy/question_mark.rs:39:8
[INFO] [stderr]    |
[INFO] [stderr] 39 | pub fn option_function_first_some_no_return(input: Option<String>) -> Option<String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `option_function_first_some_no_return_after_fix` is never used
[INFO] [stderr]   --> src/clippy/question_mark.rs:46:8
[INFO] [stderr]    |
[INFO] [stderr] 46 | pub fn option_function_first_some_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `option_function_first_some_no_match_components_no_return` is never used
[INFO] [stderr]   --> src/clippy/question_mark.rs:66:8
[INFO] [stderr]    |
[INFO] [stderr] 66 | pub fn option_function_first_some_no_match_components_no_return(input: Option<String>) -> Option<String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `option_function_first_some_no_match_components_no_return_after_fix` is never used
[INFO] [stderr]   --> src/clippy/question_mark.rs:73:8
[INFO] [stderr]    |
[INFO] [stderr] 73 | pub fn option_function_first_some_no_match_components_no_return_after_fix(input: Option<String>) -> Option<String> {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused logical operation that must be used
[INFO] [stderr]   --> src/scope.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 | /         *t1 && {
[INFO] [stderr] 14 | |             let t2 = x.borrow_mut();
[INFO] [stderr] 15 | |             *t2
[INFO] [stderr] 16 | |         }
[INFO] [stderr]    | |_________^ the logical operation produces a value
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 13 ~         let _ = *t1 && {
[INFO] [stderr] 14 |             let t2 = x.borrow_mut();
[INFO] [stderr] 15 |             *t2
[INFO] [stderr] 16 ~         };
[INFO] [stderr]    |
[INFO] [stderr] 
[INFO] [stderr] warning: `learning-rust` (bin "learning-rust" test) generated 7 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/learning_rust-f080c53937d04d2d)
[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" "12adfa392a7a1e34519f52a232e4b8f8d791a3f7a0f9583a1742a1df8df8cf81", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12adfa392a7a1e34519f52a232e4b8f8d791a3f7a0f9583a1742a1df8df8cf81", kill_on_drop: false }`
[INFO] [stdout] 12adfa392a7a1e34519f52a232e4b8f8d791a3f7a0f9583a1742a1df8df8cf81
