[INFO] cloning repository https://github.com/GrayStrider/playground-rust-book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/GrayStrider/playground-rust-book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGrayStrider%2Fplayground-rust-book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGrayStrider%2Fplayground-rust-book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bd341c23ce48da1b2611c5ee517e5a95c5bc8a50
[INFO] testing GrayStrider/playground-rust-book against try#ecabaf78506b7a4668d42dc20268c086b93f0fad for pr-87041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGrayStrider%2Fplayground-rust-book" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/GrayStrider/playground-rust-book on toolchain ecabaf78506b7a4668d42dc20268c086b93f0fad
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/GrayStrider/playground-rust-book
[INFO] finished tweaking git repo https://github.com/GrayStrider/playground-rust-book
[INFO] tweaked toml for git repo https://github.com/GrayStrider/playground-rust-book written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/GrayStrider/playground-rust-book already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3e9c1d396bf50a6eaaedfefeff755ee026e6888eea71b44350fcef6f0011e091
[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" "3e9c1d396bf50a6eaaedfefeff755ee026e6888eea71b44350fcef6f0011e091", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3e9c1d396bf50a6eaaedfefeff755ee026e6888eea71b44350fcef6f0011e091", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e9c1d396bf50a6eaaedfefeff755ee026e6888eea71b44350fcef6f0011e091", kill_on_drop: false }`
[INFO] [stdout] 3e9c1d396bf50a6eaaedfefeff755ee026e6888eea71b44350fcef6f0011e091
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "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] dce31b43828d13dbfaa51036dd13be4c6989ae00d8b5c04a5d98ed27b930d4a6
[INFO] running `Command { std: "docker" "start" "-a" "dce31b43828d13dbfaa51036dd13be4c6989ae00d8b5c04a5d98ed27b930d4a6", kill_on_drop: false }`
[INFO] [stderr]    Compiling pipeline v0.5.0
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling num-rational v0.3.0
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-complex v0.3.0
[INFO] [stderr]    Compiling num v0.3.0
[INFO] [stderr]    Compiling play3 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/std/vectors_arrays.rs:26:2
[INFO] [stdout]    |
[INFO] [stdout] 26 |     &v[2];
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/std/vectors_arrays.rs:27:2
[INFO] [stdout]    |
[INFO] [stdout] 27 |     &a[2];
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.73s
[INFO] running `Command { std: "docker" "inspect" "dce31b43828d13dbfaa51036dd13be4c6989ae00d8b5c04a5d98ed27b930d4a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dce31b43828d13dbfaa51036dd13be4c6989ae00d8b5c04a5d98ed27b930d4a6", kill_on_drop: false }`
[INFO] [stdout] dce31b43828d13dbfaa51036dd13be4c6989ae00d8b5c04a5d98ed27b930d4a6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99fa99d01bdaa92f6d2e01a3d9edf32f31b75a0fac270fb9f9e527d91e21c13d
[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" "99fa99d01bdaa92f6d2e01a3d9edf32f31b75a0fac270fb9f9e527d91e21c13d", kill_on_drop: false }`
[INFO] [stderr]    Compiling play3 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/std/vectors_arrays.rs:26:2
[INFO] [stdout]    |
[INFO] [stdout] 26 |     &v[2];
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/std/vectors_arrays.rs:27:2
[INFO] [stdout]    |
[INFO] [stdout] 27 |     &a[2];
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/std/vectors_arrays.rs:26:2
[INFO] [stdout]    |
[INFO] [stdout] 26 |     &v[2];
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/std/vectors_arrays.rs:27:2
[INFO] [stdout]    |
[INFO] [stdout] 27 |     &a[2];
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `Command { std: "docker" "inspect" "99fa99d01bdaa92f6d2e01a3d9edf32f31b75a0fac270fb9f9e527d91e21c13d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99fa99d01bdaa92f6d2e01a3d9edf32f31b75a0fac270fb9f9e527d91e21c13d", kill_on_drop: false }`
[INFO] [stdout] 99fa99d01bdaa92f6d2e01a3d9edf32f31b75a0fac270fb9f9e527d91e21c13d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ecabaf78506b7a4668d42dc20268c086b93f0fad" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ba8bd8a7ecb4c648f95ee3369e9b26108f46a9a8c66bec91180363c58ce8bda6
[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" "ba8bd8a7ecb4c648f95ee3369e9b26108f46a9a8c66bec91180363c58ce8bda6", kill_on_drop: false }`
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/std/vectors_arrays.rs:26:2
[INFO] [stderr]    |
[INFO] [stderr] 26 |     &v[2];
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/std/vectors_arrays.rs:27:2
[INFO] [stderr]    |
[INFO] [stderr] 27 |     &a[2];
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/std/vectors_arrays.rs:26:2
[INFO] [stderr]    |
[INFO] [stderr] 26 |     &v[2];
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused borrow that must be used
[INFO] [stderr]   --> src/std/vectors_arrays.rs:27:2
[INFO] [stderr]    |
[INFO] [stderr] 27 |     &a[2];
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/play3-be43625846d8a0b4)
[INFO] [stdout] test fp::tests::pipe_ ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/play3-b706e27ed931a39b)
[INFO] [stdout] test fp::composition::adds ... ok
[INFO] [stdout] test fp::tests::iterators ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests play3
[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] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test src/basics.rs - basics::main::comments::add_one (line 73) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.55s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ba8bd8a7ecb4c648f95ee3369e9b26108f46a9a8c66bec91180363c58ce8bda6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba8bd8a7ecb4c648f95ee3369e9b26108f46a9a8c66bec91180363c58ce8bda6", kill_on_drop: false }`
[INFO] [stdout] ba8bd8a7ecb4c648f95ee3369e9b26108f46a9a8c66bec91180363c58ce8bda6