[INFO] cloning repository https://github.com/minhphong306/learnrust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/minhphong306/learnrust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fminhphong306%2Flearnrust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fminhphong306%2Flearnrust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c272401e11c3af70df1d7a095fcbfcba712b79a2
[INFO] testing minhphong306/learnrust against 1.90.0 for beta-1.91-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fminhphong306%2Flearnrust" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/minhphong306/learnrust
[INFO] finished tweaking git repo https://github.com/minhphong306/learnrust
[INFO] tweaked toml for git repo https://github.com/minhphong306/learnrust written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/minhphong306/learnrust on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/minhphong306/learnrust 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 03e73d08dab6b0c008d0283436706c26ac03a7519fee2c2a29b9fdf36e96c01d
[INFO] running `Command { std: "docker" "start" "-a" "03e73d08dab6b0c008d0283436706c26ac03a7519fee2c2a29b9fdf36e96c01d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "03e73d08dab6b0c008d0283436706c26ac03a7519fee2c2a29b9fdf36e96c01d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "03e73d08dab6b0c008d0283436706c26ac03a7519fee2c2a29b9fdf36e96c01d", kill_on_drop: false }`
[INFO] [stdout] 03e73d08dab6b0c008d0283436706c26ac03a7519fee2c2a29b9fdf36e96c01d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6e7575c256e57117ece1742d06a8fa436a29dcafd81a304d43967163f674c814
[INFO] running `Command { std: "docker" "start" "-a" "6e7575c256e57117ece1742d06a8fa436a29dcafd81a304d43967163f674c814", kill_on_drop: false }`
[INFO] [stderr]    Compiling learnrust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `tuple2`
[INFO] [stdout]   --> src/main.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let tuple2 = (3, 5);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tuple2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `num` is never read
[INFO] [stdout]   --> src/main.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |     let mut num = 5;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str`
[INFO] [stdout]    --> src/main.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let str: &str = "hello world";
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_world` is never used
[INFO] [stdout]  --> src/main.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn greet_world() {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `penguin` is never used
[INFO] [stdout]   --> src/main.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn penguin() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_scalar` is never used
[INFO] [stdout]   --> src/main.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn variables_scalar() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array` is never used
[INFO] [stdout]   --> src/main.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn array() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple` is never used
[INFO] [stdout]   --> src/main.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn tuple() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/main.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn function() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutability` is never used
[INFO] [stdout]   --> src/main.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn mutability() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string` is never used
[INFO] [stdout]    --> src/main.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn string() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array_and_slice` is never used
[INFO] [stdout]    --> src/main.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn array_and_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrowing_slice` is never used
[INFO] [stdout]    --> src/main.rs:121:4
[INFO] [stdout]     |
[INFO] [stdout] 121 | fn borrowing_slice(arr: [u8; 4], slice: &[u8]) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_condition` is never used
[INFO] [stdout]    --> src/main.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn if_condition() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_loop` is never used
[INFO] [stdout]    --> src/main.rs:139:4
[INFO] [stdout]     |
[INFO] [stdout] 139 | fn for_loop() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `while_loop` is never used
[INFO] [stdout]    --> src/main.rs:145:4
[INFO] [stdout]     |
[INFO] [stdout] 145 | fn while_loop() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_statement` is never used
[INFO] [stdout]    --> src/main.rs:158:4
[INFO] [stdout]     |
[INFO] [stdout] 158 | fn match_statement() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bird` is never constructed
[INFO] [stdout]    --> src/main.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 | struct Bird {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_name` is never used
[INFO] [stdout]    --> src/main.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | impl Bird {
[INFO] [stdout]     | --------- method in this implementation
[INFO] [stdout] 174 |     fn print_name(&self) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `structs` is never used
[INFO] [stdout]    --> src/main.rs:179:4
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn structs() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Animal` is never used
[INFO] [stdout]    --> src/main.rs:186:7
[INFO] [stdout]     |
[INFO] [stdout] 186 | trait Animal {
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `trail` is never used
[INFO] [stdout]    --> src/main.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn trail() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyEnum` is never used
[INFO] [stdout]    --> src/main.rs:208:6
[INFO] [stdout]     |
[INFO] [stdout] 208 | enum MyEnum {
[INFO] [stdout]     |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_v1` is never used
[INFO] [stdout]    --> src/main.rs:237:4
[INFO] [stdout]     |
[INFO] [stdout] 237 | fn longest_v1<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_lifetime_v1` is never used
[INFO] [stdout]    --> src/main.rs:245:4
[INFO] [stdout]     |
[INFO] [stdout] 245 | fn test_lifetime_v1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::str::<impl str>::len` that must be used
[INFO] [stdout]    --> src/main.rs:106:5
[INFO] [stdout]     |
[INFO] [stdout] 106 |     slice.len();
[INFO] [stdout]     |     ^^^^^^^^^^^
[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] 106 |     let _ = slice.len();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "6e7575c256e57117ece1742d06a8fa436a29dcafd81a304d43967163f674c814", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6e7575c256e57117ece1742d06a8fa436a29dcafd81a304d43967163f674c814", kill_on_drop: false }`
[INFO] [stdout] 6e7575c256e57117ece1742d06a8fa436a29dcafd81a304d43967163f674c814
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 18f0577e74be1e7bf97f3bc41bf3a5fc6249caa9e5c9297178f0d101603327b8
[INFO] running `Command { std: "docker" "start" "-a" "18f0577e74be1e7bf97f3bc41bf3a5fc6249caa9e5c9297178f0d101603327b8", kill_on_drop: false }`
[INFO] [stderr]    Compiling learnrust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `tuple2`
[INFO] [stdout]   --> src/main.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let tuple2 = (3, 5);
[INFO] [stdout]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tuple2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `num` is never read
[INFO] [stdout]   --> src/main.rs:96:13
[INFO] [stdout]    |
[INFO] [stdout] 96 |     let mut num = 5;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `str`
[INFO] [stdout]    --> src/main.rs:102:9
[INFO] [stdout]     |
[INFO] [stdout] 102 |     let str: &str = "hello world";
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greet_world` is never used
[INFO] [stdout]  --> src/main.rs:2:4
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn greet_world() {
[INFO] [stdout]   |    ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `penguin` is never used
[INFO] [stdout]   --> src/main.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn penguin() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `variables_scalar` is never used
[INFO] [stdout]   --> src/main.rs:47:4
[INFO] [stdout]    |
[INFO] [stdout] 47 | fn variables_scalar() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array` is never used
[INFO] [stdout]   --> src/main.rs:66:4
[INFO] [stdout]    |
[INFO] [stdout] 66 | fn array() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tuple` is never used
[INFO] [stdout]   --> src/main.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn tuple() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function` is never used
[INFO] [stdout]   --> src/main.rs:86:4
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn function() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mutability` is never used
[INFO] [stdout]   --> src/main.rs:95:4
[INFO] [stdout]    |
[INFO] [stdout] 95 | fn mutability() {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `string` is never used
[INFO] [stdout]    --> src/main.rs:101:4
[INFO] [stdout]     |
[INFO] [stdout] 101 | fn string() {
[INFO] [stdout]     |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `array_and_slice` is never used
[INFO] [stdout]    --> src/main.rs:114:4
[INFO] [stdout]     |
[INFO] [stdout] 114 | fn array_and_slice() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `borrowing_slice` is never used
[INFO] [stdout]    --> src/main.rs:121:4
[INFO] [stdout]     |
[INFO] [stdout] 121 | fn borrowing_slice(arr: [u8; 4], slice: &[u8]) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `if_condition` is never used
[INFO] [stdout]    --> src/main.rs:128:4
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn if_condition() {
[INFO] [stdout]     |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `for_loop` is never used
[INFO] [stdout]    --> src/main.rs:139:4
[INFO] [stdout]     |
[INFO] [stdout] 139 | fn for_loop() {
[INFO] [stdout]     |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `while_loop` is never used
[INFO] [stdout]    --> src/main.rs:145:4
[INFO] [stdout]     |
[INFO] [stdout] 145 | fn while_loop() {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `match_statement` is never used
[INFO] [stdout]    --> src/main.rs:158:4
[INFO] [stdout]     |
[INFO] [stdout] 158 | fn match_statement() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Bird` is never constructed
[INFO] [stdout]    --> src/main.rs:168:8
[INFO] [stdout]     |
[INFO] [stdout] 168 | struct Bird {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `print_name` is never used
[INFO] [stdout]    --> src/main.rs:174:8
[INFO] [stdout]     |
[INFO] [stdout] 173 | impl Bird {
[INFO] [stdout]     | --------- method in this implementation
[INFO] [stdout] 174 |     fn print_name(&self) {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `structs` is never used
[INFO] [stdout]    --> src/main.rs:179:4
[INFO] [stdout]     |
[INFO] [stdout] 179 | fn structs() {
[INFO] [stdout]     |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `Animal` is never used
[INFO] [stdout]    --> src/main.rs:186:7
[INFO] [stdout]     |
[INFO] [stdout] 186 | trait Animal {
[INFO] [stdout]     |       ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `trail` is never used
[INFO] [stdout]    --> src/main.rs:203:4
[INFO] [stdout]     |
[INFO] [stdout] 203 | fn trail() {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyEnum` is never used
[INFO] [stdout]    --> src/main.rs:208:6
[INFO] [stdout]     |
[INFO] [stdout] 208 | enum MyEnum {
[INFO] [stdout]     |      ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_v1` is never used
[INFO] [stdout]    --> src/main.rs:237:4
[INFO] [stdout]     |
[INFO] [stdout] 237 | fn longest_v1<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `test_lifetime_v1` is never used
[INFO] [stdout]    --> src/main.rs:245:4
[INFO] [stdout]     |
[INFO] [stdout] 245 | fn test_lifetime_v1() {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `core::str::<impl str>::len` that must be used
[INFO] [stdout]    --> src/main.rs:106:5
[INFO] [stdout]     |
[INFO] [stdout] 106 |     slice.len();
[INFO] [stdout]     |     ^^^^^^^^^^^
[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] 106 |     let _ = slice.len();
[INFO] [stdout]     |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "18f0577e74be1e7bf97f3bc41bf3a5fc6249caa9e5c9297178f0d101603327b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18f0577e74be1e7bf97f3bc41bf3a5fc6249caa9e5c9297178f0d101603327b8", kill_on_drop: false }`
[INFO] [stdout] 18f0577e74be1e7bf97f3bc41bf3a5fc6249caa9e5c9297178f0d101603327b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 6cf849e40586c85bef3f6b5bbd5ce9d3deab614e3263dd43af355fb43a020721
[INFO] running `Command { std: "docker" "start" "-a" "6cf849e40586c85bef3f6b5bbd5ce9d3deab614e3263dd43af355fb43a020721", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `tuple2`
[INFO] [stderr]   --> src/main.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let tuple2 = (3, 5);
[INFO] [stderr]    |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_tuple2`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `num` is never read
[INFO] [stderr]   --> src/main.rs:96:13
[INFO] [stderr]    |
[INFO] [stderr] 96 |     let mut num = 5;
[INFO] [stderr]    |             ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `str`
[INFO] [stderr]    --> src/main.rs:102:9
[INFO] [stderr]     |
[INFO] [stderr] 102 |     let str: &str = "hello world";
[INFO] [stderr]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_str`
[INFO] [stderr] 
[INFO] [stderr] warning: function `greet_world` is never used
[INFO] [stderr]  --> src/main.rs:2:4
[INFO] [stderr]   |
[INFO] [stderr] 2 | fn greet_world() {
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `penguin` is never used
[INFO] [stderr]   --> src/main.rs:14:4
[INFO] [stderr]    |
[INFO] [stderr] 14 | fn penguin() {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `variables_scalar` is never used
[INFO] [stderr]   --> src/main.rs:47:4
[INFO] [stderr]    |
[INFO] [stderr] 47 | fn variables_scalar() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `array` is never used
[INFO] [stderr]   --> src/main.rs:66:4
[INFO] [stderr]    |
[INFO] [stderr] 66 | fn array() {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `tuple` is never used
[INFO] [stderr]   --> src/main.rs:77:4
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn tuple() {
[INFO] [stderr]    |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `function` is never used
[INFO] [stderr]   --> src/main.rs:86:4
[INFO] [stderr]    |
[INFO] [stderr] 86 | fn function() {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `mutability` is never used
[INFO] [stderr]   --> src/main.rs:95:4
[INFO] [stderr]    |
[INFO] [stderr] 95 | fn mutability() {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `string` is never used
[INFO] [stderr]    --> src/main.rs:101:4
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn string() {
[INFO] [stderr]     |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `array_and_slice` is never used
[INFO] [stderr]    --> src/main.rs:114:4
[INFO] [stderr]     |
[INFO] [stderr] 114 | fn array_and_slice() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `borrowing_slice` is never used
[INFO] [stderr]    --> src/main.rs:121:4
[INFO] [stderr]     |
[INFO] [stderr] 121 | fn borrowing_slice(arr: [u8; 4], slice: &[u8]) {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `if_condition` is never used
[INFO] [stderr]    --> src/main.rs:128:4
[INFO] [stderr]     |
[INFO] [stderr] 128 | fn if_condition() {
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `for_loop` is never used
[INFO] [stderr]    --> src/main.rs:139:4
[INFO] [stderr]     |
[INFO] [stderr] 139 | fn for_loop() {
[INFO] [stderr]     |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `while_loop` is never used
[INFO] [stderr]    --> src/main.rs:145:4
[INFO] [stderr]     |
[INFO] [stderr] 145 | fn while_loop() {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `match_statement` is never used
[INFO] [stderr]    --> src/main.rs:158:4
[INFO] [stderr]     |
[INFO] [stderr] 158 | fn match_statement() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Bird` is never constructed
[INFO] [stderr]    --> src/main.rs:168:8
[INFO] [stderr]     |
[INFO] [stderr] 168 | struct Bird {
[INFO] [stderr]     |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method `print_name` is never used
[INFO] [stderr]    --> src/main.rs:174:8
[INFO] [stderr]     |
[INFO] [stderr] 173 | impl Bird {
[INFO] [stderr]     | --------- method in this implementation
[INFO] [stderr] 174 |     fn print_name(&self) {
[INFO] [stderr]     |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `structs` is never used
[INFO] [stderr]    --> src/main.rs:179:4
[INFO] [stderr]     |
[INFO] [stderr] 179 | fn structs() {
[INFO] [stderr]     |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait `Animal` is never used
[INFO] [stderr]    --> src/main.rs:186:7
[INFO] [stderr]     |
[INFO] [stderr] 186 | trait Animal {
[INFO] [stderr]     |       ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `trail` is never used
[INFO] [stderr]    --> src/main.rs:203:4
[INFO] [stderr]     |
[INFO] [stderr] 203 | fn trail() {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum `MyEnum` is never used
[INFO] [stderr]    --> src/main.rs:208:6
[INFO] [stderr]     |
[INFO] [stderr] 208 | enum MyEnum {
[INFO] [stderr]     |      ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `longest_v1` is never used
[INFO] [stderr]    --> src/main.rs:237:4
[INFO] [stderr]     |
[INFO] [stderr] 237 | fn longest_v1<'a>(x: &'a str, y: &'a str) -> &'a str {
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `test_lifetime_v1` is never used
[INFO] [stderr]    --> src/main.rs:245:4
[INFO] [stderr]     |
[INFO] [stderr] 245 | fn test_lifetime_v1() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `core::str::<impl str>::len` that must be used
[INFO] [stderr]    --> src/main.rs:106:5
[INFO] [stderr]     |
[INFO] [stderr] 106 |     slice.len();
[INFO] [stderr]     |     ^^^^^^^^^^^
[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] 106 |     let _ = slice.len();
[INFO] [stderr]     |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `learnrust` (bin "learnrust" test) generated 26 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/learnrust-24867bcf5d1b4ce3)
[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" "6cf849e40586c85bef3f6b5bbd5ce9d3deab614e3263dd43af355fb43a020721", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6cf849e40586c85bef3f6b5bbd5ce9d3deab614e3263dd43af355fb43a020721", kill_on_drop: false }`
[INFO] [stdout] 6cf849e40586c85bef3f6b5bbd5ce9d3deab614e3263dd43af355fb43a020721