[INFO] fetching crate file_reader 0.1.0...
[INFO] testing file_reader-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate file_reader 0.1.0 into /workspace/builds/worker-0-tc1/source
[INFO] started tweaking crates.io crate file_reader 0.1.0
[INFO] finished tweaking crates.io crate file_reader 0.1.0
[INFO] tweaked toml for crates.io crate file_reader 0.1.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate file_reader 0.1.0 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 crates.io crate file_reader 0.1.0 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-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 4b0138690a17cc4e06f4b2d762c894ec6934813b29552d63d14b840f5ebd3991
[INFO] running `Command { std: "docker" "start" "-a" "4b0138690a17cc4e06f4b2d762c894ec6934813b29552d63d14b840f5ebd3991", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4b0138690a17cc4e06f4b2d762c894ec6934813b29552d63d14b840f5ebd3991", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b0138690a17cc4e06f4b2d762c894ec6934813b29552d63d14b840f5ebd3991", kill_on_drop: false }`
[INFO] [stdout] 4b0138690a17cc4e06f4b2d762c894ec6934813b29552d63d14b840f5ebd3991
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] 3f132d593f1d797f8192ba8f5b0e32c71e98c27f87b0274a7011495d0955b1cd
[INFO] running `Command { std: "docker" "start" "-a" "3f132d593f1d797f8192ba8f5b0e32c71e98c27f87b0274a7011495d0955b1cd", kill_on_drop: false }`
[INFO] [stderr]    Compiling file_reader v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `student`
[INFO] [stdout]   --> src/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let student = Student {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_student`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `grade` are never read
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct Student {
[INFO] [stdout]    |        ------- fields in this struct
[INFO] [stdout] 36 |     id: i32,
[INFO] [stdout] 37 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 38 |     grade: String,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Student` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Student` is never constructed
[INFO] [stdout]   --> src/solution.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct Student {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_student` is never used
[INFO] [stdout]   --> src/solution.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn add_student(
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `solution` is never used
[INFO] [stdout]   --> src/solution.rs:42:15
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub(crate) fn solution() {
[INFO] [stdout]    |               ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Fruit` is never constructed
[INFO] [stdout]  --> src/solution_two.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Fruit {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `increase_fruit` is never used
[INFO] [stdout]  --> src/solution_two.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn increase_fruit(fruit: Fruit) -> Fruit {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_fruit` is never used
[INFO] [stdout]   --> src/solution_two.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn new_fruit() -> Fruit {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_fruit` is never used
[INFO] [stdout]   --> src/solution_two.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn print_fruit(fruit: Fruit) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/solution_two.rs:29:15
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub(crate) fn main() {
[INFO] [stdout]    |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "3f132d593f1d797f8192ba8f5b0e32c71e98c27f87b0274a7011495d0955b1cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f132d593f1d797f8192ba8f5b0e32c71e98c27f87b0274a7011495d0955b1cd", kill_on_drop: false }`
[INFO] [stdout] 3f132d593f1d797f8192ba8f5b0e32c71e98c27f87b0274a7011495d0955b1cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] d1e572f63e4f82859eb02bf062427520ff03c92053bf1cf742a90fdd15176d36
[INFO] running `Command { std: "docker" "start" "-a" "d1e572f63e4f82859eb02bf062427520ff03c92053bf1cf742a90fdd15176d36", kill_on_drop: false }`
[INFO] [stderr]    Compiling file_reader v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `student`
[INFO] [stdout]   --> src/main.rs:66:9
[INFO] [stdout]    |
[INFO] [stdout] 66 |     let student = Student {
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_student`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `name` and `grade` are never read
[INFO] [stdout]   --> src/main.rs:37:5
[INFO] [stdout]    |
[INFO] [stdout] 35 | struct Student {
[INFO] [stdout]    |        ------- fields in this struct
[INFO] [stdout] 36 |     id: i32,
[INFO] [stdout] 37 |     name: String,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 38 |     grade: String,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Student` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Student` is never constructed
[INFO] [stdout]   --> src/solution.rs:17:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | struct Student {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_student` is never used
[INFO] [stdout]   --> src/solution.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn add_student(
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `solution` is never used
[INFO] [stdout]   --> src/solution.rs:42:15
[INFO] [stdout]    |
[INFO] [stdout] 42 | pub(crate) fn solution() {
[INFO] [stdout]    |               ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Fruit` is never constructed
[INFO] [stdout]  --> src/solution_two.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | struct Fruit {
[INFO] [stdout]   |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `increase_fruit` is never used
[INFO] [stdout]  --> src/solution_two.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn increase_fruit(fruit: Fruit) -> Fruit {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `new_fruit` is never used
[INFO] [stdout]   --> src/solution_two.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn new_fruit() -> Fruit {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `print_fruit` is never used
[INFO] [stdout]   --> src/solution_two.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn print_fruit(fruit: Fruit) {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]   --> src/solution_two.rs:29:15
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub(crate) fn main() {
[INFO] [stdout]    |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "d1e572f63e4f82859eb02bf062427520ff03c92053bf1cf742a90fdd15176d36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1e572f63e4f82859eb02bf062427520ff03c92053bf1cf742a90fdd15176d36", kill_on_drop: false }`
[INFO] [stdout] d1e572f63e4f82859eb02bf062427520ff03c92053bf1cf742a90fdd15176d36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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] e0657630848b30808f2ab3b7a651c756b11575b5f62d2700750a31401ea7d80b
[INFO] running `Command { std: "docker" "start" "-a" "e0657630848b30808f2ab3b7a651c756b11575b5f62d2700750a31401ea7d80b", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `student`
[INFO] [stderr]   --> src/main.rs:66:9
[INFO] [stderr]    |
[INFO] [stderr] 66 |     let student = Student {
[INFO] [stderr]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_student`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: fields `name` and `grade` are never read
[INFO] [stderr]   --> src/main.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 35 | struct Student {
[INFO] [stderr]    |        ------- fields in this struct
[INFO] [stderr] 36 |     id: i32,
[INFO] [stderr] 37 |     name: String,
[INFO] [stderr]    |     ^^^^
[INFO] [stderr] 38 |     grade: String,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `Student` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Student` is never constructed
[INFO] [stderr]   --> src/solution.rs:17:8
[INFO] [stderr]    |
[INFO] [stderr] 17 | struct Student {
[INFO] [stderr]    |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `add_student` is never used
[INFO] [stderr]   --> src/solution.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn add_student(
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `solution` is never used
[INFO] [stderr]   --> src/solution.rs:42:15
[INFO] [stderr]    |
[INFO] [stderr] 42 | pub(crate) fn solution() {
[INFO] [stderr]    |               ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Fruit` is never constructed
[INFO] [stderr]  --> src/solution_two.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | struct Fruit {
[INFO] [stderr]   |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `increase_fruit` is never used
[INFO] [stderr]  --> src/solution_two.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn increase_fruit(fruit: Fruit) -> Fruit {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `new_fruit` is never used
[INFO] [stderr]   --> src/solution_two.rs:15:4
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn new_fruit() -> Fruit {
[INFO] [stderr]    |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `print_fruit` is never used
[INFO] [stderr]   --> src/solution_two.rs:22:4
[INFO] [stderr]    |
[INFO] [stderr] 22 | fn print_fruit(fruit: Fruit) {
[INFO] [stderr]    |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function `main` is never used
[INFO] [stderr]   --> src/solution_two.rs:29:15
[INFO] [stderr]    |
[INFO] [stderr] 29 | pub(crate) fn main() {
[INFO] [stderr]    |               ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `file_reader` (bin "file_reader" test) generated 10 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/file_reader-8f4574b03850445d)
[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" "e0657630848b30808f2ab3b7a651c756b11575b5f62d2700750a31401ea7d80b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0657630848b30808f2ab3b7a651c756b11575b5f62d2700750a31401ea7d80b", kill_on_drop: false }`
[INFO] [stdout] e0657630848b30808f2ab3b7a651c756b11575b5f62d2700750a31401ea7d80b