[INFO] fetching crate extendr-api 0.2.0...
[INFO] checking extendr-api-0.2.0 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate extendr-api 0.2.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate extendr-api 0.2.0 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate extendr-api 0.2.0
[INFO] finished tweaking crates.io crate extendr-api 0.2.0
[INFO] tweaked toml for crates.io crate extendr-api 0.2.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded extendr-engine v0.2.0
[INFO] [stderr]   Downloaded extendr-macros v0.2.0
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd436981c10dcdb3538c6145bdd9894c8952161c25198190859fe99cb1b8597b
[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" "fd436981c10dcdb3538c6145bdd9894c8952161c25198190859fe99cb1b8597b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd436981c10dcdb3538c6145bdd9894c8952161c25198190859fe99cb1b8597b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd436981c10dcdb3538c6145bdd9894c8952161c25198190859fe99cb1b8597b", kill_on_drop: false }`
[INFO] [stdout] fd436981c10dcdb3538c6145bdd9894c8952161c25198190859fe99cb1b8597b
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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] 88925e8741b9098b4b030d667a5f3de5c1ff9d46136fed31ba6848ef7a25bcd4
[INFO] running `Command { std: "docker" "start" "-a" "88925e8741b9098b4b030d667a5f3de5c1ff9d46136fed31ba6848ef7a25bcd4", kill_on_drop: false }`
[INFO] [stderr]    Compiling libR-sys v0.2.2
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]    Compiling extendr-engine v0.2.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling extendr-macros v0.2.0
[INFO] [stderr]     Checking extendr-api v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `root_obj`
[INFO] [stdout]    --> src/iter.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 154 |     root_obj: Robj,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `root_obj`
[INFO] [stdout]    --> src/iter.rs:197:5
[INFO] [stdout]     |
[INFO] [stdout] 197 |     root_obj: Robj,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `root_obj`
[INFO] [stdout]    --> src/iter.rs:154:5
[INFO] [stdout]     |
[INFO] [stdout] 154 |     root_obj: Robj,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `root_obj`
[INFO] [stdout]    --> src/iter.rs:197:5
[INFO] [stdout]     |
[INFO] [stdout] 197 |     root_obj: Robj,
[INFO] [stdout]     |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 17.35s
[INFO] running `Command { std: "docker" "inspect" "88925e8741b9098b4b030d667a5f3de5c1ff9d46136fed31ba6848ef7a25bcd4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "88925e8741b9098b4b030d667a5f3de5c1ff9d46136fed31ba6848ef7a25bcd4", kill_on_drop: false }`
[INFO] [stdout] 88925e8741b9098b4b030d667a5f3de5c1ff9d46136fed31ba6848ef7a25bcd4