[INFO] cloning repository https://github.com/ignoreAnt/rust-learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ignoreAnt/rust-learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FignoreAnt%2Frust-learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FignoreAnt%2Frust-learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 05ce36d412ca40017a1f0d1f7f1959157d620c8c
[INFO] building ignoreAnt/rust-learning against try#d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6 for pr-146237-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FignoreAnt%2Frust-learning" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ignoreAnt/rust-learning
[INFO] finished tweaking git repo https://github.com/ignoreAnt/rust-learning
[INFO] tweaked toml for git repo https://github.com/ignoreAnt/rust-learning written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ignoreAnt/rust-learning on toolchain d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ignoreAnt/rust-learning 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" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b126af37cde59bde04052058eb9ff7bd93945a3552ee9009868af74d7d80365
[INFO] running `Command { std: "docker" "start" "-a" "3b126af37cde59bde04052058eb9ff7bd93945a3552ee9009868af74d7d80365", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b126af37cde59bde04052058eb9ff7bd93945a3552ee9009868af74d7d80365", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b126af37cde59bde04052058eb9ff7bd93945a3552ee9009868af74d7d80365", kill_on_drop: false }`
[INFO] [stdout] 3b126af37cde59bde04052058eb9ff7bd93945a3552ee9009868af74d7d80365
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 54ecee52c31a63e62acbce3fa6cbcc8e5d552e6b40ddd3e330d8ac344ce16ae1
[INFO] running `Command { std: "docker" "start" "-a" "54ecee52c31a63e62acbce3fa6cbcc8e5d552e6b40ddd3e330d8ac344ce16ae1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.89
[INFO] [stderr]    Compiling unicode-ident v1.0.13
[INFO] [stderr]    Compiling libc v0.2.162
[INFO] [stderr]    Compiling pin-project-lite v0.2.15
[INFO] [stderr]    Compiling smallvec v1.13.2
[INFO] [stderr]    Compiling log v0.4.22
[INFO] [stderr]    Compiling stable_deref_trait v1.2.0
[INFO] [stderr]    Compiling bytes v1.8.0
[INFO] [stderr]    Compiling futures-core v0.3.31
[INFO] [stderr]    Compiling litemap v0.7.3
[INFO] [stderr]    Compiling writeable v0.5.5
[INFO] [stderr]    Compiling once_cell v1.20.2
[INFO] [stderr]    Compiling typenum v1.17.0
[INFO] [stderr]    Compiling itoa v1.0.11
[INFO] [stderr]    Compiling memchr v2.7.4
[INFO] [stderr]    Compiling pkg-config v0.3.31
[INFO] [stderr]    Compiling tracing-core v0.1.32
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling icu_locid_transform_data v1.5.0
[INFO] [stderr]    Compiling serde v1.0.214
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling jobserver v0.1.32
[INFO] [stderr]    Compiling parking_lot_core v0.9.10
[INFO] [stderr]    Compiling socket2 v0.5.7
[INFO] [stderr]    Compiling syn v2.0.87
[INFO] [stderr]    Compiling parking_lot v0.12.3
[INFO] [stderr]    Compiling signal-hook-registry v1.4.2
[INFO] [stderr]    Compiling cc v1.1.36
[INFO] [stderr]    Compiling mio v1.0.2
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling getrandom v0.2.15
[INFO] [stderr]    Compiling futures-sink v0.3.31
[INFO] [stderr]    Compiling icu_properties_data v1.5.0
[INFO] [stderr]    Compiling percent-encoding v2.3.1
[INFO] [stderr]    Compiling slab v0.4.9
[INFO] [stderr]    Compiling zstd-safe v7.2.1
[INFO] [stderr]    Compiling icu_normalizer_data v1.5.0
[INFO] [stderr]    Compiling tokio v1.41.1
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling futures-task v0.3.31
[INFO] [stderr]    Compiling utf8_iter v1.0.4
[INFO] [stderr]    Compiling fnv v1.0.7
[INFO] [stderr]    Compiling utf16_iter v1.0.5
[INFO] [stderr]    Compiling local-waker v0.1.4
[INFO] [stderr]    Compiling write16 v1.0.0
[INFO] [stderr]    Compiling http v0.2.12
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling aho-corasick v1.1.3
[INFO] [stderr]    Compiling ahash v0.8.11
[INFO] [stderr]    Compiling num-conv v0.1.0
[INFO] [stderr]    Compiling time-core v0.1.2
[INFO] [stderr]    Compiling equivalent v1.0.1
[INFO] [stderr]    Compiling hashbrown v0.15.1
[INFO] [stderr]    Compiling regex-lite v0.1.6
[INFO] [stderr]    Compiling zstd-sys v2.0.13+zstd.1.5.6
[INFO] [stderr]    Compiling regex-syntax v0.8.5
[INFO] [stderr]    Compiling httparse v1.9.5
[INFO] [stderr]    Compiling indexmap v2.6.0
[INFO] [stderr]    Compiling deranged v0.3.11
[INFO] [stderr]    Compiling time-macros v0.2.18
[INFO] [stderr]    Compiling miniz_oxide v0.8.0
[INFO] [stderr]    Compiling bytestring v1.3.1
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling synstructure v0.13.1
[INFO] [stderr]    Compiling actix-service v2.0.2
[INFO] [stderr]    Compiling regex-automata v0.4.8
[INFO] [stderr]    Compiling brotli-decompressor v4.0.1
[INFO] [stderr]    Compiling actix-utils v3.0.1
[INFO] [stderr]    Compiling form_urlencoded v1.2.1
[INFO] [stderr]    Compiling tokio-util v0.7.12
[INFO] [stderr]    Compiling actix-rt v2.10.0
[INFO] [stderr]    Compiling zerofrom-derive v0.1.4
[INFO] [stderr]    Compiling yoke-derive v0.7.4
[INFO] [stderr]    Compiling zerovec-derive v0.10.3
[INFO] [stderr]    Compiling displaydoc v0.2.5
[INFO] [stderr]    Compiling icu_provider_macros v1.5.0
[INFO] [stderr]    Compiling zerocopy-derive v0.7.35
[INFO] [stderr]    Compiling serde_derive v1.0.214
[INFO] [stderr]    Compiling zerofrom v0.1.4
[INFO] [stderr]    Compiling cookie v0.16.2
[INFO] [stderr]    Compiling yoke v0.7.4
[INFO] [stderr]    Compiling bitflags v2.6.0
[INFO] [stderr]    Compiling ryu v1.0.18
[INFO] [stderr]    Compiling zerovec v0.10.4
[INFO] [stderr]    Compiling serde_json v1.0.132
[INFO] [stderr]    Compiling cpufeatures v0.2.14
[INFO] [stderr]    Compiling sha1 v0.10.6
[INFO] [stderr]    Compiling actix-router v0.5.3
[INFO] [stderr]    Compiling actix-codec v0.5.2
[INFO] [stderr]    Compiling zerocopy v0.7.35
[INFO] [stderr]    Compiling derive_more v0.99.18
[INFO] [stderr]    Compiling flate2 v1.0.34
[INFO] [stderr]    Compiling regex v1.11.1
[INFO] [stderr]    Compiling tinystr v0.7.6
[INFO] [stderr]    Compiling icu_collections v1.5.0
[INFO] [stderr]    Compiling ppv-lite86 v0.2.20
[INFO] [stderr]    Compiling icu_locid v1.5.0
[INFO] [stderr]    Compiling h2 v0.3.26
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling brotli v6.0.0
[INFO] [stderr]    Compiling time v0.3.36
[INFO] [stderr]    Compiling icu_provider v1.5.0
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling icu_locid_transform v1.5.0
[INFO] [stderr]    Compiling local-channel v0.1.5
[INFO] [stderr]    Compiling mime v0.3.17
[INFO] [stderr]    Compiling icu_properties v1.5.1
[INFO] [stderr]    Compiling httpdate v1.0.3
[INFO] [stderr]    Compiling language-tags v0.3.2
[INFO] [stderr]    Compiling actix-web-codegen v4.3.0
[INFO] [stderr]    Compiling actix-server v2.5.0
[INFO] [stderr]    Compiling actix-macros v0.2.4
[INFO] [stderr]    Compiling impl-more v0.1.8
[INFO] [stderr]    Compiling icu_normalizer v1.5.0
[INFO] [stderr]    Compiling serde_urlencoded v0.7.1
[INFO] [stderr]    Compiling idna_adapter v1.2.0
[INFO] [stderr]    Compiling idna v1.0.3
[INFO] [stderr]    Compiling url v2.5.3
[INFO] [stderr]    Compiling zstd v0.13.2
[INFO] [stderr]    Compiling actix-http v3.9.0
[INFO] [stderr]    Compiling actix-web v4.9.0
[INFO] [stderr]    Compiling rust-learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/pointer_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut x = 42;
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]  --> src/bin/slices_demo.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let word = first_word_v1(&s); // word will get the value 5
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/bin/slices_demo.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let s = "Hello, world!";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/bin/slices_demo.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let word = first_word_v1(&my_string[0..6]);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let c = 30;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/slices_demo.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::from("hello world");
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let s = String::from("hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let s = "hello";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `positive_sum` is never used
[INFO] [stdout]   --> src/positive_numbers_sum.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn positive_sum(arr: &[i32]) -> i32 { // fn positive_sum: Defines a function named positive_sum.
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/bin/slices_demo.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/arrays_demo.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let mut v = vec![10, 20, 30, 40, 50];
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/arrays_demo.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let mut v = vec![10, 20, 30, 40, 50];
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::slice::<impl [T]>::contains` that must be used
[INFO] [stdout]  --> src/bin/arrays_demo.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     lazy_caterer.contains(&12);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[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] 5 |     let _ = lazy_caterer.contains(&12);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `heap_data`
[INFO] [stdout]   --> src/bin/memory_error.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let heap_data = vec![0u8; 1024 * 1024 * 1024]; // 1 GB heap allocation
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heap_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/bin/string_demo.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let b = &greeting;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]  --> src/bin/data_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let number:i128 = 128;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/bin/data_types.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let num:u8 = 128;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `largest`
[INFO] [stdout]   --> src/bin/data_types.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let largest = largest(&list);
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_largest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]  --> src/bin/ownership.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn change(some_string: &String) -> &String {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_vector` is never used
[INFO] [stdout]    --> src/bin/data_types.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn build_vector() -> Vec<i16> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/webserver_demo.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | /     server
[INFO] [stdout] 24 | |         .bind("127.0.0.1:3000")?
[INFO] [stdout] 25 | |         .run()
[INFO] [stdout] 26 | |         .await;
[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] 23 |     let _ = server
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 35s
[INFO] running `Command { std: "docker" "inspect" "54ecee52c31a63e62acbce3fa6cbcc8e5d552e6b40ddd3e330d8ac344ce16ae1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54ecee52c31a63e62acbce3fa6cbcc8e5d552e6b40ddd3e330d8ac344ce16ae1", kill_on_drop: false }`
[INFO] [stdout] 54ecee52c31a63e62acbce3fa6cbcc8e5d552e6b40ddd3e330d8ac344ce16ae1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+d79d87d4c0f7f0d0785ad6e493cf8cf718ed89a6" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6d82a0cc1e3a0ba13b4186eae0053b36c8a5f902ba1cf5cdd9db2013fd7ec60
[INFO] running `Command { std: "docker" "start" "-a" "c6d82a0cc1e3a0ba13b4186eae0053b36c8a5f902ba1cf5cdd9db2013fd7ec60", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `heap_data`
[INFO] [stdout]   --> src/bin/memory_error.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let heap_data = vec![0u8; 1024 * 1024 * 1024]; // 1 GB heap allocation
[INFO] [stdout]    |         ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_heap_data`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]  --> src/bin/slices_demo.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let word = first_word_v1(&s); // word will get the value 5
[INFO] [stdout]   |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]  --> src/bin/slices_demo.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let s = "Hello, world!";
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/bin/slices_demo.rs:10:9
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let word = first_word_v1(&my_string[0..6]);
[INFO] [stdout]    |         ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/slices_demo.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let mut s = String::from("hello world");
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `first_word` is never used
[INFO] [stdout]   --> src/bin/slices_demo.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn first_word(s: &String) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]  --> src/bin/string_demo.rs:5:9
[INFO] [stdout]   |
[INFO] [stdout] 5 |     let b = &greeting;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `change` is never used
[INFO] [stdout]  --> src/bin/ownership.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn change(some_string: &String) -> &String {
[INFO] [stdout]   |    ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `number`
[INFO] [stdout]  --> src/bin/data_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let number:i128 = 128;
[INFO] [stdout]   |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_number`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `num`
[INFO] [stdout]  --> src/bin/data_types.rs:6:9
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let num:u8 = 128;
[INFO] [stdout]   |         ^^^ help: if this is intentional, prefix it with an underscore: `_num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `largest`
[INFO] [stdout]   --> src/bin/data_types.rs:67:9
[INFO] [stdout]    |
[INFO] [stdout] 67 |     let largest = largest(&list);
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_largest`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `build_vector` is never used
[INFO] [stdout]    --> src/bin/data_types.rs:108:4
[INFO] [stdout]     |
[INFO] [stdout] 108 | fn build_vector() -> Vec<i16> {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `c`
[INFO] [stdout]  --> src/main.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let c = 30;
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_c`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let s = String::from("hello");
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/main.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let s = "hello";
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]   --> src/bin/arrays_demo.rs:39:13
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let mut v = vec![10, 20, 30, 40, 50];
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/arrays_demo.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |     let mut v = vec![10, 20, 30, 40, 50];
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::slice::<impl [T]>::contains` that must be used
[INFO] [stdout]  --> src/bin/arrays_demo.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     lazy_caterer.contains(&12);
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[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] 5 |     let _ = lazy_caterer.contains(&12);
[INFO] [stdout]   |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/bin/pointer_types.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let mut x = 42;
[INFO] [stdout]   |         ----^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/webserver_demo.rs:23:5
[INFO] [stdout]    |
[INFO] [stdout] 23 | /     server
[INFO] [stdout] 24 | |         .bind("127.0.0.1:3000")?
[INFO] [stdout] 25 | |         .run()
[INFO] [stdout] 26 | |         .await;
[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] 23 |     let _ = server
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 2.03s
[INFO] running `Command { std: "docker" "inspect" "c6d82a0cc1e3a0ba13b4186eae0053b36c8a5f902ba1cf5cdd9db2013fd7ec60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6d82a0cc1e3a0ba13b4186eae0053b36c8a5f902ba1cf5cdd9db2013fd7ec60", kill_on_drop: false }`
[INFO] [stdout] c6d82a0cc1e3a0ba13b4186eae0053b36c8a5f902ba1cf5cdd9db2013fd7ec60
