[INFO] cloning repository https://github.com/hpp-playground/rust-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hpp-playground/rust-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhpp-playground%2Frust-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhpp-playground%2Frust-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f1be8df07be226685d7538ec7c8b670262e242b3
[INFO] testing hpp-playground/rust-playground against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhpp-playground%2Frust-playground" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hpp-playground/rust-playground on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hpp-playground/rust-playground
[INFO] finished tweaking git repo https://github.com/hpp-playground/rust-playground
[INFO] tweaked toml for git repo https://github.com/hpp-playground/rust-playground written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/hpp-playground/rust-playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f1724ff2bbaf375a4231e17741e2723b9ba74dae5d314df53b60be6d1c58fbc7
[INFO] running `Command { std: "docker" "start" "-a" "f1724ff2bbaf375a4231e17741e2723b9ba74dae5d314df53b60be6d1c58fbc7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f1724ff2bbaf375a4231e17741e2723b9ba74dae5d314df53b60be6d1c58fbc7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1724ff2bbaf375a4231e17741e2723b9ba74dae5d314df53b60be6d1c58fbc7", kill_on_drop: false }`
[INFO] [stdout] f1724ff2bbaf375a4231e17741e2723b9ba74dae5d314df53b60be6d1c58fbc7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a7ebffd3075e1efb0a53f850219478b5f8d30cf981e48fcd98804eab478bfb10
[INFO] running `Command { std: "docker" "start" "-a" "a7ebffd3075e1efb0a53f850219478b5f8d30cf981e48fcd98804eab478bfb10", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.33
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling either v1.6.0
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling smart-default v0.6.0
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::binary_heap::Iter`
[INFO] [stdout]  --> src/bin/iterator-learning.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::binary_heap::Iter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/bin/iterator-learning.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let b: std::slice::Iter<i32> = a.iter();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Leaf`
[INFO] [stdout]  --> src/bin/iterator-learning.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 |     Leaf(Item),
[INFO] [stdout]   |     ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Children`
[INFO] [stdout]  --> src/bin/iterator-learning.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Children(Vec<Node<Item>>),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `traverse`
[INFO] [stdout]  --> src/bin/iterator-learning.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn traverse(&self, f: impl Fn(&It)) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.75s
[INFO] running `Command { std: "docker" "inspect" "a7ebffd3075e1efb0a53f850219478b5f8d30cf981e48fcd98804eab478bfb10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7ebffd3075e1efb0a53f850219478b5f8d30cf981e48fcd98804eab478bfb10", kill_on_drop: false }`
[INFO] [stdout] a7ebffd3075e1efb0a53f850219478b5f8d30cf981e48fcd98804eab478bfb10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9aabdd586adc3cf1b5e98d90aff98d0c57b595485b2b0c1dc48a4cc483927ce0
[INFO] running `Command { std: "docker" "start" "-a" "9aabdd586adc3cf1b5e98d90aff98d0c57b595485b2b0c1dc48a4cc483927ce0", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust-playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::binary_heap::Iter`
[INFO] [stdout]  --> src/bin/iterator-learning.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::collections::binary_heap::Iter;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]   --> src/bin/iterator-learning.rs:79:9
[INFO] [stdout]    |
[INFO] [stdout] 79 |     let b: std::slice::Iter<i32> = a.iter();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `traverse`
[INFO] [stdout]  --> src/bin/iterator-learning.rs:9:8
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn traverse(&self, f: impl Fn(&It)) {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.71s
[INFO] [stderr]   Executable unittests src/bin/ctf-cpawq6.rs (/opt/rustwide/target/debug/deps/ctf_cpawq6-aceeb68ca2d1c898)
[INFO] [stderr]   Executable unittests src/bin/iterator-learning.rs (/opt/rustwide/target/debug/deps/iterator_learning-f1fa5dd4b60e32ac)
[INFO] [stderr]   Executable unittests src/bin/none-eq.rs (/opt/rustwide/target/debug/deps/none_eq-695f88f311f2aa97)
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_playground-5d11b97b9c84ad92)
[INFO] [stderr]   Executable unittests src/bin/smart-default.rs (/opt/rustwide/target/debug/deps/smart_default-aa227c0604a4e291)
[INFO] [stderr]   Executable unittests src/bin/string-chunk.rs (/opt/rustwide/target/debug/deps/string_chunk-a3969ada2bea3389)
[INFO] running `Command { std: "docker" "inspect" "9aabdd586adc3cf1b5e98d90aff98d0c57b595485b2b0c1dc48a4cc483927ce0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9aabdd586adc3cf1b5e98d90aff98d0c57b595485b2b0c1dc48a4cc483927ce0", kill_on_drop: false }`
[INFO] [stdout] 9aabdd586adc3cf1b5e98d90aff98d0c57b595485b2b0c1dc48a4cc483927ce0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7aecf55563564ae2695bb27c0655086d5610aac0c4d499dea3a5c3afc09f3a82
[INFO] running `Command { std: "docker" "start" "-a" "7aecf55563564ae2695bb27c0655086d5610aac0c4d499dea3a5c3afc09f3a82", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `std::collections::binary_heap::Iter`
[INFO] [stderr]  --> src/bin/iterator-learning.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::collections::binary_heap::Iter;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]   --> src/bin/iterator-learning.rs:79:9
[INFO] [stderr]    |
[INFO] [stderr] 79 |     let b: std::slice::Iter<i32> = a.iter();
[INFO] [stderr]    |         ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `traverse`
[INFO] [stderr]  --> src/bin/iterator-learning.rs:9:8
[INFO] [stderr]   |
[INFO] [stderr] 9 |     fn traverse(&self, f: impl Fn(&It)) {
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-playground` (bin "iterator-learning" test) generated 3 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/bin/ctf-cpawq6.rs (/opt/rustwide/target/debug/deps/ctf_cpawq6-aceeb68ca2d1c898)
[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 0.02s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/iterator-learning.rs (/opt/rustwide/target/debug/deps/iterator_learning-f1fa5dd4b60e32ac)
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test test_borrowing_for_loop ... ok
[INFO] [stdout] test test_borrowing_iterator ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/none-eq.rs (/opt/rustwide/target/debug/deps/none_eq-695f88f311f2aa97)
[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] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/rust_playground-5d11b97b9c84ad92)
[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] [stderr]      Running unittests src/bin/smart-default.rs (/opt/rustwide/target/debug/deps/smart_default-aa227c0604a4e291)
[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] [stderr]      Running unittests src/bin/string-chunk.rs (/opt/rustwide/target/debug/deps/string_chunk-a3969ada2bea3389)
[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" "7aecf55563564ae2695bb27c0655086d5610aac0c4d499dea3a5c3afc09f3a82", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7aecf55563564ae2695bb27c0655086d5610aac0c4d499dea3a5c3afc09f3a82", kill_on_drop: false }`
[INFO] [stdout] 7aecf55563564ae2695bb27c0655086d5610aac0c4d499dea3a5c3afc09f3a82