[INFO] cloning repository https://github.com/zni/slippy
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zni/slippy" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzni%2Fslippy", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzni%2Fslippy'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9b542d3057a89c105a8e9affb2b5602b4d2263d2
[INFO] checking zni/slippy against try#b2f80f6008cdafc35b4472bd46afa16cc6b0cd63 for pr-79470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fzni%2Fslippy" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/zni/slippy on toolchain b2f80f6008cdafc35b4472bd46afa16cc6b0cd63
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zni/slippy
[INFO] finished tweaking git repo https://github.com/zni/slippy
[INFO] tweaked toml for git repo https://github.com/zni/slippy written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/zni/slippy already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded utf8parse v0.1.1
[INFO] [stderr]   Downloaded dirs v2.0.1
[INFO] [stderr]   Downloaded log v0.4.7
[INFO] [stderr]   Downloaded rustyline v5.0.0
[INFO] [stderr]   Downloaded dirs-sys v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "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] e3757fc5ad864676f69316d5273aabe42eb2d45abe5bcfe49131b6bc93268b18
[INFO] running `Command { std: "docker" "start" "-a" "e3757fc5ad864676f69316d5273aabe42eb2d45abe5bcfe49131b6bc93268b18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3757fc5ad864676f69316d5273aabe42eb2d45abe5bcfe49131b6bc93268b18", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3757fc5ad864676f69316d5273aabe42eb2d45abe5bcfe49131b6bc93268b18", kill_on_drop: false }`
[INFO] [stdout] e3757fc5ad864676f69316d5273aabe42eb2d45abe5bcfe49131b6bc93268b18
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b2f80f6008cdafc35b4472bd46afa16cc6b0cd63" "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] 3717408d687dae86acd409004d23205c5e4c84819f893be9922f3171ea3a39a6
[INFO] running `Command { std: "docker" "start" "-a" "3717408d687dae86acd409004d23205c5e4c84819f893be9922f3171ea3a39a6", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.60
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling log v0.4.7
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking dirs-sys v0.3.3
[INFO] [stderr]     Checking dirs v2.0.1
[INFO] [stderr]     Checking rustyline v5.0.0
[INFO] [stderr]     Checking slippy v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]    --> src/builtins.rs:488:31
[INFO] [stdout]     |
[INFO] [stdout] 488 | pub fn display(list: &[Expr], env: Rc<RefCell<Env>>) -> Result<Expr, &'static str> {
[INFO] [stdout]     |                               ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `env`
[INFO] [stdout]    --> src/builtins.rs:488:31
[INFO] [stdout]     |
[INFO] [stdout] 488 | pub fn display(list: &[Expr], env: Rc<RefCell<Env>>) -> Result<Expr, &'static str> {
[INFO] [stdout]     |                               ^^^ help: if this is intentional, prefix it with an underscore: `_env`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.14s
[INFO] running `Command { std: "docker" "inspect" "3717408d687dae86acd409004d23205c5e4c84819f893be9922f3171ea3a39a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3717408d687dae86acd409004d23205c5e4c84819f893be9922f3171ea3a39a6", kill_on_drop: false }`
[INFO] [stdout] 3717408d687dae86acd409004d23205c5e4c84819f893be9922f3171ea3a39a6