[INFO] fetching crate carbon-lib 0.3.1...
[INFO] checking carbon-lib-0.3.1 against beta for pr-78714
[INFO] extracting crate carbon-lib 0.3.1 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate carbon-lib 0.3.1 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate carbon-lib 0.3.1
[INFO] finished tweaking crates.io crate carbon-lib 0.3.1
[INFO] tweaked toml for crates.io crate carbon-lib 0.3.1 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 73c488b8b83f3ff7edf68a1419c6ecf8b6d55348f663331bacf2660411e6337c
[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" "73c488b8b83f3ff7edf68a1419c6ecf8b6d55348f663331bacf2660411e6337c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "73c488b8b83f3ff7edf68a1419c6ecf8b6d55348f663331bacf2660411e6337c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "73c488b8b83f3ff7edf68a1419c6ecf8b6d55348f663331bacf2660411e6337c", kill_on_drop: false }`
[INFO] [stdout] 73c488b8b83f3ff7edf68a1419c6ecf8b6d55348f663331bacf2660411e6337c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 539278168ec95e92c109218ac08859f4478e539b2f8dd8384b76ff6fea4e8e17
[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" "539278168ec95e92c109218ac08859f4478e539b2f8dd8384b76ff6fea4e8e17", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.62
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling syn v1.0.48
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking serde_json v1.0.59
[INFO] [stderr]     Checking flate2 v1.0.19
[INFO] [stderr]    Compiling onig_sys v69.5.1
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking plist v1.0.0
[INFO] [stderr]    Compiling serde_derive v1.0.117
[INFO] [stderr]     Checking onig v6.1.0
[INFO] [stderr]     Checking syntect v4.4.0
[INFO] [stderr]     Checking carbon-dump v1.2.2
[INFO] [stderr]     Checking carbon-lib v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/highlight.rs:54:22
[INFO] [stdout]    |
[INFO] [stdout] 54 |                 Some(s) => {
[INFO] [stdout]    |                      ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s`
[INFO] [stdout]   --> src/highlight.rs:54:22
[INFO] [stdout]    |
[INFO] [stdout] 54 |                 Some(s) => {
[INFO] [stdout]    |                      ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `html_fancy_box`
[INFO] [stdout]   --> src/utils/html.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn html_fancy_box(s: &str, title: &Option<String>) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `html_fancy_box`
[INFO] [stdout]   --> src/utils/html.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | pub fn html_fancy_box(s: &str, title: &Option<String>) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 28.19s
[INFO] running `Command { std: "docker" "inspect" "539278168ec95e92c109218ac08859f4478e539b2f8dd8384b76ff6fea4e8e17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "539278168ec95e92c109218ac08859f4478e539b2f8dd8384b76ff6fea4e8e17", kill_on_drop: false }`
[INFO] [stdout] 539278168ec95e92c109218ac08859f4478e539b2f8dd8384b76ff6fea4e8e17