[INFO] cloning repository https://github.com/wy15/learnrust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wy15/learnrust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwy15%2Flearnrust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwy15%2Flearnrust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6b0739405e073b6dfaf46983708ebfd32d7222a
[INFO] checking wy15/learnrust against try#15e8bc6907ab2b3623cb52acc726f4787458df64 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwy15%2Flearnrust" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wy15/learnrust on toolchain 15e8bc6907ab2b3623cb52acc726f4787458df64
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wy15/learnrust
[INFO] finished tweaking git repo https://github.com/wy15/learnrust
[INFO] tweaked toml for git repo https://github.com/wy15/learnrust written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/wy15/learnrust 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" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded serde-pickle v1.1.0
[INFO] [stderr]   Downloaded iter-read v0.3.1
[INFO] [stderr]   Downloaded flume v0.10.11
[INFO] [stderr]   Downloaded nanorand v0.6.1
[INFO] [stderr]   Downloaded tracing-core v0.1.22
[INFO] [stderr]   Downloaded tracing v0.1.31
[INFO] [stderr]   Downloaded mio v0.8.0
[INFO] [stderr]   Downloaded exr v1.4.1
[INFO] [stderr]   Downloaded h2 v0.3.11
[INFO] [stderr]   Downloaded image v0.24.1
[INFO] [stderr]   Downloaded jpeg-decoder v0.2.2
[INFO] [stderr]   Downloaded tiff v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 412db5917ecb30809956dd3911258ac8f5938fea6515574b66da8cbc50a8fbd4
[INFO] running `Command { std: "docker" "start" "-a" "412db5917ecb30809956dd3911258ac8f5938fea6515574b66da8cbc50a8fbd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "412db5917ecb30809956dd3911258ac8f5938fea6515574b66da8cbc50a8fbd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "412db5917ecb30809956dd3911258ac8f5938fea6515574b66da8cbc50a8fbd4", kill_on_drop: false }`
[INFO] [stdout] 412db5917ecb30809956dd3911258ac8f5938fea6515574b66da8cbc50a8fbd4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTDOCFLAGS=--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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c05bd35bc0bb632e54a859846e75b036cee935701ad8243fb72be33f968a4a97
[INFO] running `Command { std: "docker" "start" "-a" "c05bd35bc0bb632e54a859846e75b036cee935701ad8243fb72be33f968a4a97", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]    Compiling pkg-config v0.3.24
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling proc-macro2 v1.0.36
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking pin-project-lite v0.2.8
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]     Checking itoa v1.0.1
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling crossbeam-utils v0.8.7
[INFO] [stderr]    Compiling indexmap v1.8.0
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]     Checking http v0.2.6
[INFO] [stderr]     Checking tracing-core v0.1.22
[INFO] [stderr]     Checking slab v0.4.5
[INFO] [stderr]     Checking once_cell v1.9.0
[INFO] [stderr]    Compiling httparse v1.6.0
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.7
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]     Checking openssl-probe v0.1.5
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking tracing v0.1.31
[INFO] [stderr]    Compiling openssl-sys v0.9.72
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]     Checking httpdate v1.0.2
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]     Checking tower-service v0.3.1
[INFO] [stderr]    Compiling encoding_rs v0.8.30
[INFO] [stderr]    Compiling bzip2-sys v0.1.11+1.0.8
[INFO] [stderr]     Checking crossbeam-channel v0.5.2
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]     Checking lock_api v0.4.6
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking ryu v1.0.9
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking socket2 v0.4.4
[INFO] [stderr]     Checking mio v0.8.0
[INFO] [stderr]     Checking flate2 v1.0.22
[INFO] [stderr]     Checking getrandom v0.2.5
[INFO] [stderr]     Checking spin v0.9.2
[INFO] [stderr]     Checking nanorand v0.6.1
[INFO] [stderr]     Checking deflate v1.0.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling openssl v0.10.38
[INFO] [stderr]    Compiling native-tls v0.2.8
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]     Checking ipnet v2.3.1
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]     Checking iter-read v0.3.1
[INFO] [stderr]     Checking tokio v1.17.0
[INFO] [stderr]     Checking mime v0.3.16
[INFO] [stderr]     Checking weezl v0.1.5
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking inflate v0.4.5
[INFO] [stderr]     Checking miniz_oxide v0.5.1
[INFO] [stderr]     Checking jpeg-decoder v0.1.22
[INFO] [stderr]     Checking lebe v0.5.1
[INFO] [stderr]     Checking half v1.8.2
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]     Checking gif v0.11.3
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking bytemuck v1.8.0
[INFO] [stderr]     Checking scoped_threadpool v0.1.9
[INFO] [stderr]     Checking regex v1.5.5
[INFO] [stderr]     Checking png v0.17.5
[INFO] [stderr]     Checking tiff v0.7.1
[INFO] [stderr]     Checking challenge2 v0.1.0 (/opt/rustwide/workdir/challenge2)
[INFO] [stderr]     Checking challenge1 v0.1.0 (/opt/rustwide/workdir/challenge1)
[INFO] [stderr]     Checking bzip2 v0.4.3
[INFO] [stderr]     Checking http-body v0.4.4
[INFO] [stderr]     Checking challenge3 v0.1.0 (/opt/rustwide/workdir/challenge3)
[INFO] [stderr]     Checking serde_urlencoded v0.7.1
[INFO] [stderr]     Checking serde-pickle v1.1.0
[INFO] [stderr]     Checking jpeg-decoder v0.2.2
[INFO] [stderr]     Checking challenge8 v0.1.0 (/opt/rustwide/workdir/challenge8)
[INFO] [stderr]     Checking tokio-util v0.6.9
[INFO] [stderr]     Checking tokio-native-tls v0.3.0
[INFO] [stderr]     Checking h2 v0.3.11
[INFO] [stderr]    Compiling pin-project-internal v1.0.10
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]     Checking zip v0.5.13
[INFO] [stderr]     Checking pin-project v1.0.10
[INFO] [stderr]     Checking flume v0.10.11
[INFO] [stderr]     Checking exr v1.4.1
[INFO] [stderr]     Checking challenge6 v0.1.0 (/opt/rustwide/workdir/challenge6)
[INFO] [stderr]     Checking hyper v0.14.17
[INFO] [stderr]     Checking image v0.24.1
[INFO] [stderr]     Checking hyper-tls v0.5.0
[INFO] [stderr]     Checking reqwest v0.11.9
[INFO] [stderr]     Checking challenge4 v0.1.0 (/opt/rustwide/workdir/challenge4)
[INFO] [stderr]     Checking challenge5 v0.1.0 (/opt/rustwide/workdir/challenge5)
[INFO] [stderr]     Checking challenge7 v0.1.0 (/opt/rustwide/workdir/challenge7)
[INFO] [stderr]     Checking challenge v0.1.0 (/opt/rustwide/workdir/challenge)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 19.20s
[INFO] running `Command { std: "docker" "inspect" "c05bd35bc0bb632e54a859846e75b036cee935701ad8243fb72be33f968a4a97", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c05bd35bc0bb632e54a859846e75b036cee935701ad8243fb72be33f968a4a97", kill_on_drop: false }`
[INFO] [stdout] c05bd35bc0bb632e54a859846e75b036cee935701ad8243fb72be33f968a4a97