[INFO] cloning repository https://github.com/minidonut/30-seconds-of-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/minidonut/30-seconds-of-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fminidonut%2F30-seconds-of-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fminidonut%2F30-seconds-of-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cec833b8c6b1c14ca125b4874a9d6657a11d4d94
[INFO] checking minidonut/30-seconds-of-rust against master#8424f8e8cdf07010967a57584fd647b30e930d4d for pr-120095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fminidonut%2F30-seconds-of-rust" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/minidonut/30-seconds-of-rust on toolchain 8424f8e8cdf07010967a57584fd647b30e930d4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8424f8e8cdf07010967a57584fd647b30e930d4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/minidonut/30-seconds-of-rust
[INFO] finished tweaking git repo https://github.com/minidonut/30-seconds-of-rust
[INFO] tweaked toml for git repo https://github.com/minidonut/30-seconds-of-rust written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/minidonut/30-seconds-of-rust 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" "+8424f8e8cdf07010967a57584fd647b30e930d4d" "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
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking minidonut/30-seconds-of-rust against try#047472f299946caf090d1b5608ae4bd9f0416256+rustflags=-Ddereferencing_mut_binding for pr-120095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fminidonut%2F30-seconds-of-rust" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/minidonut/30-seconds-of-rust on toolchain 047472f299946caf090d1b5608ae4bd9f0416256
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/minidonut/30-seconds-of-rust
[INFO] finished tweaking git repo https://github.com/minidonut/30-seconds-of-rust
[INFO] tweaked toml for git repo https://github.com/minidonut/30-seconds-of-rust written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/minidonut/30-seconds-of-rust 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" "+047472f299946caf090d1b5608ae4bd9f0416256" "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 insta v1.29.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bd3c4bb9eb3b1572ac90d144914b47bf4b097ef2d2c79667e7d66f2bcdde427c
[INFO] running `Command { std: "docker" "start" "-a" "bd3c4bb9eb3b1572ac90d144914b47bf4b097ef2d2c79667e7d66f2bcdde427c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bd3c4bb9eb3b1572ac90d144914b47bf4b097ef2d2c79667e7d66f2bcdde427c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd3c4bb9eb3b1572ac90d144914b47bf4b097ef2d2c79667e7d66f2bcdde427c", kill_on_drop: false }`
[INFO] [stdout] bd3c4bb9eb3b1572ac90d144914b47bf4b097ef2d2c79667e7d66f2bcdde427c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Ddereferencing_mut_binding" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 754a4fe0f056830fd1f73071bf15721caa53433ccaafa697defe8ed500b5a902
[INFO] running `Command { std: "docker" "start" "-a" "754a4fe0f056830fd1f73071bf15721caa53433ccaafa697defe8ed500b5a902", 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 v0.2.140
[INFO] [stderr]    Compiling io-lifetimes v1.0.9
[INFO] [stderr]     Checking unicode-width v0.1.10
[INFO] [stderr]    Compiling rustix v0.37.6
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking linked-hash-map v0.5.6
[INFO] [stderr]     Checking linux-raw-sys v0.3.1
[INFO] [stderr]     Checking once_cell v1.17.1
[INFO] [stderr]     Checking fastrand v1.9.0
[INFO] [stderr]     Checking similar v2.2.1
[INFO] [stderr]     Checking scraper v0.1.0 (/opt/rustwide/workdir/scraper)
[INFO] [stderr]     Checking aho-corasick v0.7.20
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stdout] warning: function `extract_inner_text` is never used
[INFO] [stdout]  --> scraper/src/extract_inner_text.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn extract_inner_text(target: &str, lefts: &[&str], right: &str) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_start_index` is never used
[INFO] [stdout]   --> scraper/src/extract_inner_text.rs:22:4
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn find_start_index(lefts: &[&str], start_idx: usize, target: &str) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_inner_texts` is never used
[INFO] [stdout]  --> scraper/src/extract_inner_texts.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn extract_inner_texts(target: &str, left: &str, right: &str) -> Vec<String> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_outer_text` is never used
[INFO] [stdout]  --> scraper/src/extract_outer_text.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn extract_outer_text(target: &str, lefts: &[&str], right: &str) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `find_start_index` is never used
[INFO] [stdout]   --> scraper/src/extract_outer_text.rs:24:4
[INFO] [stdout]    |
[INFO] [stdout] 24 | fn find_start_index(lefts: &[&str], start_idx: usize, target: &str) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `extract_outer_texts` is never used
[INFO] [stdout]  --> scraper/src/extract_outer_texts.rs:4:8
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub fn extract_outer_texts(target: &str, left: &str, right: &str) -> Vec<String> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `index_of_with_start` is never used
[INFO] [stdout]  --> scraper/src/index_of.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn index_of_with_start(pattern: &str, start_index: usize, text: &str) -> Option<usize> {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `index_of` is never used
[INFO] [stdout]  --> scraper/src/index_of.rs:5:8
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn index_of(pattern: &str, text: &str) -> Option<usize> {
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `generic_index_of` is never used
[INFO] [stdout]  --> scraper/src/index_of.rs:9:4
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn generic_index_of(pattern: &str, text: &str, start_index: usize) -> Option<usize> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `strip_last_char` is never used
[INFO] [stdout]  --> scraper/src/string_utils.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn strip_last_char(s: &str) -> String {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 10 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking yaml-rust v0.4.5
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking console v0.15.5
[INFO] [stderr]     Checking os_pipe v1.1.3
[INFO] [stderr]     Checking shared_child v1.0.0
[INFO] [stderr]     Checking clap v2.34.0
[INFO] [stderr]     Checking duct v0.13.6
[INFO] [stderr]     Checking regex v1.7.3
[INFO] [stderr]     Checking insta v1.29.0
[INFO] [stderr]     Checking grep-lite v0.1.0 (/opt/rustwide/workdir/grep-lite)
[INFO] [stderr]     Checking tempfile v3.5.0
[INFO] [stdout] warning: function `stdin_bytes` is never used
[INFO] [stdout]    --> grep-lite/src/main.rs:104:8
[INFO] [stdout]     |
[INFO] [stdout] 104 |     fn stdin_bytes(bytes: &[u8]) -> duct::Expression {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.92s
[INFO] running `Command { std: "docker" "inspect" "754a4fe0f056830fd1f73071bf15721caa53433ccaafa697defe8ed500b5a902", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "754a4fe0f056830fd1f73071bf15721caa53433ccaafa697defe8ed500b5a902", kill_on_drop: false }`
[INFO] [stdout] 754a4fe0f056830fd1f73071bf15721caa53433ccaafa697defe8ed500b5a902