[INFO] cloning repository https://github.com/austbot/tab
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/austbot/tab" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faustbot%2Ftab", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faustbot%2Ftab'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 922cd656794b80c0dc2ffdec337eda325fbf253a
[INFO] checking austbot/tab against master#195ad4830e11a544391abe296b146450dea8411b for pr-82781
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Faustbot%2Ftab" "/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/austbot/tab on toolchain 195ad4830e11a544391abe296b146450dea8411b
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/austbot/tab
[INFO] finished tweaking git repo https://github.com/austbot/tab
[INFO] tweaked toml for git repo https://github.com/austbot/tab written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/austbot/tab already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "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-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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b8dc05b6d3b6bc61bff8316da22bd0f5996862514ace544c03d8d95d515997ab
[INFO] running `Command { std: "docker" "start" "-a" "b8dc05b6d3b6bc61bff8316da22bd0f5996862514ace544c03d8d95d515997ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b8dc05b6d3b6bc61bff8316da22bd0f5996862514ace544c03d8d95d515997ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b8dc05b6d3b6bc61bff8316da22bd0f5996862514ace544c03d8d95d515997ab", kill_on_drop: false }`
[INFO] [stdout] b8dc05b6d3b6bc61bff8316da22bd0f5996862514ace544c03d8d95d515997ab
[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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+195ad4830e11a544391abe296b146450dea8411b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 499ce9cbd400161cb0cacbc4177d3cae0818102cd2debb19f0f7685ee0284fbb
[INFO] running `Command { std: "docker" "start" "-a" "499ce9cbd400161cb0cacbc4177d3cae0818102cd2debb19f0f7685ee0284fbb", kill_on_drop: false }`
[INFO] [stderr]     Checking swim v0.1.0 (/opt/rustwide/workdir/swim)
[INFO] [stderr]     Checking rand v0.3.18
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> swim/src/lib.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub type Swimmer = Box<FnBox + Send + 'static>;
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnBox + Send + 'static`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> swim/src/lib.rs:14:24
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub type Swimmer = Box<FnBox + Send + 'static>;
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnBox + Send + 'static`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> swim/src/lib.rs:53:34
[INFO] [stdout]    |
[INFO] [stdout] 53 |         assert!(self.is_setup(), true);
[INFO] [stdout]    |                                  ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 53 |         assert!(self.is_setup(), "{}", true);
[INFO] [stdout]    |                                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> swim/src/lib.rs:53:34
[INFO] [stdout]    |
[INFO] [stdout] 53 |         assert!(self.is_setup(), true);
[INFO] [stdout]    |                                  ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 53 |         assert!(self.is_setup(), "{}", true);
[INFO] [stdout]    |                                  ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> swim/src/lib.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |         self.sender.as_ref().unwrap().send(job);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> swim/src/lib.rs:54:9
[INFO] [stdout]    |
[INFO] [stdout] 54 |         self.sender.as_ref().unwrap().send(job);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking tab v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.13s
[INFO] running `Command { std: "docker" "inspect" "499ce9cbd400161cb0cacbc4177d3cae0818102cd2debb19f0f7685ee0284fbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "499ce9cbd400161cb0cacbc4177d3cae0818102cd2debb19f0f7685ee0284fbb", kill_on_drop: false }`
[INFO] [stdout] 499ce9cbd400161cb0cacbc4177d3cae0818102cd2debb19f0f7685ee0284fbb