[INFO] fetching crate command-builder 0.2.0...
[INFO] checking command-builder-0.2.0 against master#936f2600b6c903b04387f74ed5cbce88bb06d243 for pr-91141
[INFO] extracting crate command-builder 0.2.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate command-builder 0.2.0 on toolchain 936f2600b6c903b04387f74ed5cbce88bb06d243
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate command-builder 0.2.0
[INFO] finished tweaking crates.io crate command-builder 0.2.0
[INFO] tweaked toml for crates.io crate command-builder 0.2.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "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] 268043ccc9ca660f1f422d91cff548f791ced6fd17c334c9e6e90cdfa4f3cefb
[INFO] running `Command { std: "docker" "start" "-a" "268043ccc9ca660f1f422d91cff548f791ced6fd17c334c9e6e90cdfa4f3cefb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "268043ccc9ca660f1f422d91cff548f791ced6fd17c334c9e6e90cdfa4f3cefb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "268043ccc9ca660f1f422d91cff548f791ced6fd17c334c9e6e90cdfa4f3cefb", kill_on_drop: false }`
[INFO] [stdout] 268043ccc9ca660f1f422d91cff548f791ced6fd17c334c9e6e90cdfa4f3cefb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+936f2600b6c903b04387f74ed5cbce88bb06d243" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 42974fe7de62cc43a5351d5ffdc2317769a976d81482f9be711bb6f5d8aefb23
[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" "42974fe7de62cc43a5351d5ffdc2317769a976d81482f9be711bb6f5d8aefb23", kill_on_drop: false }`
[INFO] [stderr]     Checking command-builder v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `on`
[INFO] [stdout]    --> src/lib.rs:179:5
[INFO] [stdout]     |
[INFO] [stdout] 179 |     on: C,
[INFO] [stdout]     |     ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `keys`
[INFO] [stdout]    --> src/lib.rs:180:5
[INFO] [stdout]     |
[INFO] [stdout] 180 |     keys: I,
[INFO] [stdout]     |     ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `a` found for struct `Single` in the current scope
[INFO] [stdout]    --> src/lib.rs:8:14
[INFO] [stdout]     |
[INFO] [stdout] 8   |             .a("foo\nbar\nbaz")
[INFO] [stdout]     |              ^ method not found in `Single`
[INFO] [stdout] ...
[INFO] [stdout] 453 | pub struct Single(Vec<String>);
[INFO] [stdout]     | ------------------------------- method `a` not found for this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `a` found for struct `Single` in the current scope
[INFO] [stdout]    --> src/lib.rs:9:39
[INFO] [stdout]     |
[INFO] [stdout] 9   |             .pipe(Single::new("grep").a("bar"));
[INFO] [stdout]     |                                       ^ method not found in `Single`
[INFO] [stdout] ...
[INFO] [stdout] 453 | pub struct Single(Vec<String>);
[INFO] [stdout]     | ------------------------------- method `a` not found for this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `command-builder` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "42974fe7de62cc43a5351d5ffdc2317769a976d81482f9be711bb6f5d8aefb23", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42974fe7de62cc43a5351d5ffdc2317769a976d81482f9be711bb6f5d8aefb23", kill_on_drop: false }`
[INFO] [stdout] 42974fe7de62cc43a5351d5ffdc2317769a976d81482f9be711bb6f5d8aefb23