[INFO] fetching crate birds 0.2.0...
[INFO] checking birds-0.2.0 against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] extracting crate birds 0.2.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate birds 0.2.0 on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate birds 0.2.0
[INFO] finished tweaking crates.io crate birds 0.2.0
[INFO] tweaked toml for crates.io crate birds 0.2.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff9fb297402fb4c84b54e57fd551449eaf891053b552e231a0c32b6b814fabc6
[INFO] running `Command { std: "docker" "start" "-a" "ff9fb297402fb4c84b54e57fd551449eaf891053b552e231a0c32b6b814fabc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff9fb297402fb4c84b54e57fd551449eaf891053b552e231a0c32b6b814fabc6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff9fb297402fb4c84b54e57fd551449eaf891053b552e231a0c32b6b814fabc6", kill_on_drop: false }`
[INFO] [stdout] ff9fb297402fb4c84b54e57fd551449eaf891053b552e231a0c32b6b814fabc6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac36bc8dc305805a54f7c0f26b0323b9224baf9c865d012dcc33fff264bef87c
[INFO] running `Command { std: "docker" "start" "-a" "ac36bc8dc305805a54f7c0f26b0323b9224baf9c865d012dcc33fff264bef87c", kill_on_drop: false }`
[INFO] [stderr]     Checking birds v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/lib.rs:142:1
[INFO] [stdout]     |
[INFO] [stdout] 142 | / pub fn sage<A, X>(x: X) -> A
[INFO] [stdout] 143 | | where
[INFO] [stdout] 144 | |     X: Fn(A) -> A + Clone,
[INFO] [stdout]     | |__________________________^ cannot return without recursing
[INFO] [stdout] 145 |   {
[INFO] [stdout] 146 |       x(sage(x.clone()))
[INFO] [stdout]     |         --------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/lib.rs:142:1
[INFO] [stdout]     |
[INFO] [stdout] 142 | / pub fn sage<A, X>(x: X) -> A
[INFO] [stdout] 143 | | where
[INFO] [stdout] 144 | |     X: Fn(A) -> A + Clone,
[INFO] [stdout]     | |__________________________^ cannot return without recursing
[INFO] [stdout] 145 |   {
[INFO] [stdout] 146 |       x(sage(x.clone()))
[INFO] [stdout]     |         --------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` 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` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] running `Command { std: "docker" "inspect" "ac36bc8dc305805a54f7c0f26b0323b9224baf9c865d012dcc33fff264bef87c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac36bc8dc305805a54f7c0f26b0323b9224baf9c865d012dcc33fff264bef87c", kill_on_drop: false }`
[INFO] [stdout] ac36bc8dc305805a54f7c0f26b0323b9224baf9c865d012dcc33fff264bef87c