[INFO] cloning repository https://github.com/SubstrateDevAcademy/v1-exercise-4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/SubstrateDevAcademy/v1-exercise-4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSubstrateDevAcademy%2Fv1-exercise-4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSubstrateDevAcademy%2Fv1-exercise-4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d2033c04bacc91f0e125dd70e67b7200209b1cd0
[INFO] checking SubstrateDevAcademy/v1-exercise-4 against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSubstrateDevAcademy%2Fv1-exercise-4" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/SubstrateDevAcademy/v1-exercise-4 on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SubstrateDevAcademy/v1-exercise-4
[INFO] finished tweaking git repo https://github.com/SubstrateDevAcademy/v1-exercise-4
[INFO] tweaked toml for git repo https://github.com/SubstrateDevAcademy/v1-exercise-4 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/SubstrateDevAcademy/v1-exercise-4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 63350f93dd65ba59958b0c4d81cedb4d0a526ebefdefe9dd1cbf1945ed3450fc
[INFO] running `Command { std: "docker" "start" "-a" "63350f93dd65ba59958b0c4d81cedb4d0a526ebefdefe9dd1cbf1945ed3450fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "63350f93dd65ba59958b0c4d81cedb4d0a526ebefdefe9dd1cbf1945ed3450fc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63350f93dd65ba59958b0c4d81cedb4d0a526ebefdefe9dd1cbf1945ed3450fc", kill_on_drop: false }`
[INFO] [stdout] 63350f93dd65ba59958b0c4d81cedb4d0a526ebefdefe9dd1cbf1945ed3450fc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 46b4e9af79183b957ba8fcdf7c2300c784ad9e2e79c9014dd33dd241784d792b
[INFO] running `Command { std: "docker" "start" "-a" "46b4e9af79183b957ba8fcdf7c2300c784ad9e2e79c9014dd33dd241784d792b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.82
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling syn v1.0.58
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling log v0.4.13
[INFO] [stderr]    Compiling serde_derive v1.0.119
[INFO] [stderr]    Compiling serde v1.0.119
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]     Checking byteorder v1.4.2
[INFO] [stderr]     Checking futures-core v0.3.11
[INFO] [stderr]     Checking pin-project-lite v0.2.4
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking futures-io v0.3.11
[INFO] [stderr]     Checking futures-sink v0.3.11
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking subtle v2.4.0
[INFO] [stderr]     Checking tinyvec_macros v0.1.0
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking signature v1.3.0
[INFO] [stderr]    Compiling serde_json v1.0.61
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]     Checking object v0.22.0
[INFO] [stderr]    Compiling regex-syntax v0.6.22
[INFO] [stderr]    Compiling getrandom v0.2.1
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]    Compiling anyhow v1.0.38
[INFO] [stderr]     Checking sp-std v2.0.1
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling ppv-lite86 v0.2.10
[INFO] [stderr]     Checking data-encoding v2.3.1
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]     Checking cache-padded v1.1.1
[INFO] [stderr]     Checking parking v2.0.0
[INFO] [stderr]     Checking pin-project-lite v0.1.11
[INFO] [stderr]     Checking async-task v4.0.3
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.69
[INFO] [stderr]     Checking atomic-waker v1.0.0
[INFO] [stderr]    Compiling wasm-bindgen v0.2.69
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]    Compiling zstd-safe v2.0.6+zstd.1.4.7
[INFO] [stderr]     Checking termcolor v1.1.2
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]     Checking arc-swap v1.2.0
[INFO] [stderr]     Checking scoped-tls v1.0.0
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling rustc-demangle v0.1.18
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking retain_mut v0.1.2
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]    Compiling sc-consensus-slots v0.8.1
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking thread_local v1.1.0
[INFO] [stderr]     Checking tracing-core v0.1.17
[INFO] [stderr]     Checking sharded-slab v0.1.1
[INFO] [stderr]    Compiling nom v5.1.2
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking lock_api v0.4.2
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking tinyvec v1.1.0
[INFO] [stderr]     Checking ed25519 v1.0.3
[INFO] [stderr]    Compiling hashbrown v0.9.1
[INFO] [stderr]     Checking form_urlencoded v1.0.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling semver v0.6.0
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking dns-parser v0.8.0
[INFO] [stderr]     Checking futures-channel v0.3.11
[INFO] [stderr]     Checking quicksink v0.1.2
[INFO] [stderr]     Checking concurrent-queue v1.2.2
[INFO] [stderr]     Checking wast v31.0.0
[INFO] [stderr]     Checking matrixmultiply v0.2.4
[INFO] [stderr]    Compiling walkdir v2.3.1
[INFO] [stderr]    Compiling substrate-build-script-utils v2.0.1
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking hashbrown v0.1.8
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking lru v0.6.3
[INFO] [stderr]     Checking linked_hash_set v0.1.4
[INFO] [stderr]     Checking http v0.2.3
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]    Compiling clang-sys v0.29.3
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling heck v0.3.2
[INFO] [stderr]    Compiling parity-wasm v0.32.0
[INFO] [stderr]    Compiling semver-parser v0.10.2
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]    Compiling indexmap v1.6.1
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling hashbrown v0.8.2
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking uint v0.8.5
[INFO] [stderr]    Compiling build-helper v0.1.1
[INFO] [stderr]     Checking async-channel v1.5.1
[INFO] [stderr]    Compiling hashbrown v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling bindgen v0.54.0
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking blake2b_simd v0.5.11
[INFO] [stderr]     Checking blake2s_simd v0.5.11
[INFO] [stderr]    Compiling aho-corasick v0.7.15
[INFO] [stderr]     Checking unicode-normalization v0.1.16
[INFO] [stderr]     Checking futures-lite v1.11.3
[INFO] [stderr]     Checking bstr v0.2.14
[INFO] [stderr]     Checking matchers v0.0.1
[INFO] [stderr]     Checking tracing-log v0.1.1
[INFO] [stderr]     Checking trie-db v0.22.2
[INFO] [stderr]     Checking kv-log-macro v1.0.7
[INFO] [stderr]     Checking regalloc v0.0.27
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]     Checking pwasm-utils v0.14.0
[INFO] [stderr]     Checking want v0.2.0
[INFO] [stderr]    Compiling node-template v2.0.1 (/opt/rustwide/workdir/node)
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr] error: could not compile `regex-syntax`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name regex_syntax /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/regex-syntax-0.6.22/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="unicode"' --cfg 'feature="unicode-age"' --cfg 'feature="unicode-bool"' --cfg 'feature="unicode-case"' --cfg 'feature="unicode-gencat"' --cfg 'feature="unicode-perl"' --cfg 'feature="unicode-script"' --cfg 'feature="unicode-segment"' -C metadata=0e1637be2d60a974 -C extra-filename=-0e1637be2d60a974 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints allow --cap-lints=forbid` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "46b4e9af79183b957ba8fcdf7c2300c784ad9e2e79c9014dd33dd241784d792b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46b4e9af79183b957ba8fcdf7c2300c784ad9e2e79c9014dd33dd241784d792b", kill_on_drop: false }`
[INFO] [stdout] 46b4e9af79183b957ba8fcdf7c2300c784ad9e2e79c9014dd33dd241784d792b