[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 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGrayStrider%2Fplayground-rust-book" "/workspace/builds/worker-99/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-99/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/GrayStrider/playground-rust-book on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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-99/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" "+1.60.0" "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-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 71beab31b761945b0732d3c11386085b8e683fc4de2dd57e7cf2b53cefe8d901
[INFO] running `Command { std: "docker" "start" "-a" "71beab31b761945b0732d3c11386085b8e683fc4de2dd57e7cf2b53cefe8d901", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71beab31b761945b0732d3c11386085b8e683fc4de2dd57e7cf2b53cefe8d901", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71beab31b761945b0732d3c11386085b8e683fc4de2dd57e7cf2b53cefe8d901", kill_on_drop: false }`
[INFO] [stdout] 71beab31b761945b0732d3c11386085b8e683fc4de2dd57e7cf2b53cefe8d901
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 084101f9793f40a54697c6600f4efcebbbf6d7d950e2d096d2b48e975782b9d5
[INFO] running `Command { std: "docker" "start" "-a" "084101f9793f40a54697c6600f4efcebbbf6d7d950e2d096d2b48e975782b9d5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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]    |     ^^^^^ the borrow produces a value
[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] 26 |     let _ = &v[2];
[INFO] [stdout]    |     +++++++
[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]    |     ^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let _ = &a[2];
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Chars` that must be used
[INFO] [stdout]   --> src/std/strings.rs:41:2
[INFO] [stdout]    |
[INFO] [stdout] 41 |     word.chars();
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::str::Bytes` that must be used
[INFO] [stdout]   --> src/std/strings.rs:42:2
[INFO] [stdout]    |
[INFO] [stdout] 42 |     word.bytes();
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2m 26s
[INFO] running `Command { std: "docker" "inspect" "084101f9793f40a54697c6600f4efcebbbf6d7d950e2d096d2b48e975782b9d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "084101f9793f40a54697c6600f4efcebbbf6d7d950e2d096d2b48e975782b9d5", kill_on_drop: false }`
[INFO] [stdout] 084101f9793f40a54697c6600f4efcebbbf6d7d950e2d096d2b48e975782b9d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0352a2529cfc591091b472430401d45dfdd01af8418979dd0ad75ee791a7df7f
[INFO] running `Command { std: "docker" "start" "-a" "0352a2529cfc591091b472430401d45dfdd01af8418979dd0ad75ee791a7df7f", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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]    |     ^^^^^ the borrow produces a value
[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] 26 |     let _ = &v[2];
[INFO] [stdout]    |     +++++++
[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]    |     ^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let _ = &a[2];
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling play3 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Chars` that must be used
[INFO] [stdout]   --> src/std/strings.rs:41:2
[INFO] [stdout]    |
[INFO] [stdout] 41 |     word.chars();
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::str::Bytes` that must be used
[INFO] [stdout]   --> src/std/strings.rs:42:2
[INFO] [stdout]    |
[INFO] [stdout] 42 |     word.bytes();
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 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]    |     ^^^^^ the borrow produces a value
[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] 26 |     let _ = &v[2];
[INFO] [stdout]    |     +++++++
[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]    |     ^^^^^ the borrow produces a value
[INFO] [stdout]    |
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 27 |     let _ = &a[2];
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Chars` that must be used
[INFO] [stdout]   --> src/std/strings.rs:41:2
[INFO] [stdout]    |
[INFO] [stdout] 41 |     word.chars();
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::str::Bytes` that must be used
[INFO] [stdout]   --> src/std/strings.rs:42:2
[INFO] [stdout]    |
[INFO] [stdout] 42 |     word.bytes();
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 7.21s
[INFO] running `Command { std: "docker" "inspect" "0352a2529cfc591091b472430401d45dfdd01af8418979dd0ad75ee791a7df7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0352a2529cfc591091b472430401d45dfdd01af8418979dd0ad75ee791a7df7f", kill_on_drop: false }`
[INFO] [stdout] 0352a2529cfc591091b472430401d45dfdd01af8418979dd0ad75ee791a7df7f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-99/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" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] ac464f76940f0d05d650af7e8784bf85b3f3433109c25fbde1f26e41864d1ce8
[INFO] running `Command { std: "docker" "start" "-a" "ac464f76940f0d05d650af7e8784bf85b3f3433109c25fbde1f26e41864d1ce8", kill_on_drop: false }`
[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]    |     ^^^^^ the borrow produces a value
[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] 26 |     let _ = &v[2];
[INFO] [stderr]    |     +++++++
[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]    |     ^^^^^ the borrow produces a value
[INFO] [stderr]    |
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 27 |     let _ = &a[2];
[INFO] [stderr]    |     +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Chars` that must be used
[INFO] [stderr]   --> src/std/strings.rs:41:2
[INFO] [stderr]    |
[INFO] [stderr] 41 |     word.chars();
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::str::Bytes` that must be used
[INFO] [stderr]   --> src/std/strings.rs:42:2
[INFO] [stderr]    |
[INFO] [stderr] 42 |     word.bytes();
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: iterators are lazy and do nothing unless consumed
[INFO] [stderr] 
[INFO] [stderr] warning: `play3` (lib) generated 4 warnings
[INFO] [stderr] warning: `play3` (lib test) generated 4 warnings (4 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/play3-21fa5f0de35a5b2e)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test fp::composition::adds ... ok
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/play3-80f97167b720ee77)
[INFO] [stdout] test fp::tests::iterators ... ok
[INFO] [stdout] test fp::tests::pipe_ ... 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] [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]    Doc-tests play3
[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 0.39s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "ac464f76940f0d05d650af7e8784bf85b3f3433109c25fbde1f26e41864d1ce8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac464f76940f0d05d650af7e8784bf85b3f3433109c25fbde1f26e41864d1ce8", kill_on_drop: false }`
[INFO] [stdout] ac464f76940f0d05d650af7e8784bf85b3f3433109c25fbde1f26e41864d1ce8