[INFO] cloning repository https://github.com/barbiefan/learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/barbiefan/learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbarbiefan%2Flearning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbarbiefan%2Flearning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 788df24a6ab2dca144ca5754a70e5e5510f2f520
[INFO] testing barbiefan/learning against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbarbiefan%2Flearning" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/barbiefan/learning on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/barbiefan/learning
[INFO] finished tweaking git repo https://github.com/barbiefan/learning
[INFO] tweaked toml for git repo https://github.com/barbiefan/learning written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/barbiefan/learning already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 67c3af2113b3b2382ad1815dce53e5dff3619e2b18f9ad2af5106559fffc9671
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "67c3af2113b3b2382ad1815dce53e5dff3619e2b18f9ad2af5106559fffc9671", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "67c3af2113b3b2382ad1815dce53e5dff3619e2b18f9ad2af5106559fffc9671", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "67c3af2113b3b2382ad1815dce53e5dff3619e2b18f9ad2af5106559fffc9671", kill_on_drop: false }`
[INFO] [stdout] 67c3af2113b3b2382ad1815dce53e5dff3619e2b18f9ad2af5106559fffc9671
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 5484d8046aac17bf26900cecd0629f0d8108cc87b0dbda911be2839c1dd78fba
[INFO] running `Command { std: "docker" "start" "-a" "5484d8046aac17bf26900cecd0629f0d8108cc87b0dbda911be2839c1dd78fba", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.105
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling getrandom v0.2.3
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/notes.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::env;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fibb`
[INFO] [stdout]  --> src/fibb.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn fibb() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nthfibb`
[INFO] [stdout]   --> src/fibb.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn nthfibb(n: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/notes.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     name: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `date`
[INFO] [stdout]   --> src/notes.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     date: i32,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `text`
[INFO] [stdout]   --> src/notes.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     text: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `write_file`
[INFO] [stdout]   --> src/notes.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn write_file(name: &String, contents: &String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pass_gen`
[INFO] [stdout]  --> src/pass_gen.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn pass_gen() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generate`
[INFO] [stdout]   --> src/pass_gen.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn generate(length: i32) -> String {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/notes.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |             buf_reader.read_to_string(&mut contents);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.37s
[INFO] running `Command { std: "docker" "inspect" "5484d8046aac17bf26900cecd0629f0d8108cc87b0dbda911be2839c1dd78fba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5484d8046aac17bf26900cecd0629f0d8108cc87b0dbda911be2839c1dd78fba", kill_on_drop: false }`
[INFO] [stdout] 5484d8046aac17bf26900cecd0629f0d8108cc87b0dbda911be2839c1dd78fba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b58c3d8c7e39568c8e452ab2cf439c4ecfa8f45354b1103f6699386b724fa7aa
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b58c3d8c7e39568c8e452ab2cf439c4ecfa8f45354b1103f6699386b724fa7aa", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::env`
[INFO] [stdout]  --> src/notes.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::env;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fibb`
[INFO] [stdout]  --> src/fibb.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn fibb() {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `nthfibb`
[INFO] [stdout]   --> src/fibb.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn nthfibb(n: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `name`
[INFO] [stdout]   --> src/notes.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     name: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `date`
[INFO] [stdout]   --> src/notes.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 21 |     date: i32,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `text`
[INFO] [stdout]   --> src/notes.rs:22:5
[INFO] [stdout]    |
[INFO] [stdout] 22 |     text: String,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `write_file`
[INFO] [stdout]   --> src/notes.rs:77:4
[INFO] [stdout]    |
[INFO] [stdout] 77 | fn write_file(name: &String, contents: &String) -> String {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `pass_gen`
[INFO] [stdout]  --> src/pass_gen.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn pass_gen() {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generate`
[INFO] [stdout]   --> src/pass_gen.rs:20:4
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn generate(length: i32) -> String {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/notes.rs:70:13
[INFO] [stdout]    |
[INFO] [stdout] 70 |             buf_reader.read_to_string(&mut contents);
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.37s
[INFO] running `Command { std: "docker" "inspect" "b58c3d8c7e39568c8e452ab2cf439c4ecfa8f45354b1103f6699386b724fa7aa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b58c3d8c7e39568c8e452ab2cf439c4ecfa8f45354b1103f6699386b724fa7aa", kill_on_drop: false }`
[INFO] [stdout] b58c3d8c7e39568c8e452ab2cf439c4ecfa8f45354b1103f6699386b724fa7aa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 8345ccdd8e01c22b7897f6dd3e6321eab6b87af33f72606f375e20ec18933e46
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8345ccdd8e01c22b7897f6dd3e6321eab6b87af33f72606f375e20ec18933e46", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::env`
[INFO] [stderr]  --> src/notes.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::env;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fibb`
[INFO] [stderr]  --> src/fibb.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | pub fn fibb() {
[INFO] [stderr]   |        ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `nthfibb`
[INFO] [stderr]   --> src/fibb.rs:24:4
[INFO] [stderr]    |
[INFO] [stderr] 24 | fn nthfibb(n: i32) -> i32 {
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `name`
[INFO] [stderr]   --> src/notes.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     name: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `date`
[INFO] [stderr]   --> src/notes.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 |     date: i32,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `text`
[INFO] [stderr]   --> src/notes.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 |     text: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `write_file`
[INFO] [stderr]   --> src/notes.rs:77:4
[INFO] [stderr]    |
[INFO] [stderr] 77 | fn write_file(name: &String, contents: &String) -> String {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `pass_gen`
[INFO] [stderr]  --> src/pass_gen.rs:3:8
[INFO] [stderr]   |
[INFO] [stderr] 3 | pub fn pass_gen() {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generate`
[INFO] [stderr]   --> src/pass_gen.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn generate(length: i32) -> String {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/notes.rs:70:13
[INFO] [stderr]    |
[INFO] [stderr] 70 |             buf_reader.read_to_string(&mut contents);
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `learning` (bin "learning" test) generated 10 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/learning-1ada05314f75a16b)
[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" "8345ccdd8e01c22b7897f6dd3e6321eab6b87af33f72606f375e20ec18933e46", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8345ccdd8e01c22b7897f6dd3e6321eab6b87af33f72606f375e20ec18933e46", kill_on_drop: false }`
[INFO] [stdout] 8345ccdd8e01c22b7897f6dd3e6321eab6b87af33f72606f375e20ec18933e46