[INFO] crate cowrc 0.0.4 is already in cache
[INFO] checking cowrc-0.0.4 against master#30ca215b4e38b32aa7abdd635c5e2d56f5724494 for pr-66037
[INFO] extracting crate cowrc 0.0.4 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate cowrc 0.0.4 on toolchain 30ca215b4e38b32aa7abdd635c5e2d56f5724494
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate cowrc 0.0.4
[INFO] finished tweaking crates.io crate cowrc 0.0.4
[INFO] tweaked toml for crates.io crate cowrc 0.0.4 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+30ca215b4e38b32aa7abdd635c5e2d56f5724494" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f8d3dd83bac86276b6070b33d15d3073d32aa054251588338990174daea0162e
[INFO] running `"docker" "start" "-a" "f8d3dd83bac86276b6070b33d15d3073d32aa054251588338990174daea0162e"`
[INFO] [stderr]     Checking cowrc v0.0.4 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0599]: no method named `make_unique` found for struct `std::rc::Rc<T>` in the current scope
[INFO] [stderr]   --> src/lib.rs:42:16
[INFO] [stderr]    |
[INFO] [stderr] 42 |         self.v.make_unique()
[INFO] [stderr]    |                ^^^^^^^^^^^ method not found in `std::rc::Rc<T>`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `make_unique` found for struct `std::sync::Arc<T>` in the current scope
[INFO] [stderr]   --> src/lib.rs:55:16
[INFO] [stderr]    |
[INFO] [stderr] 55 |         self.v.make_unique()
[INFO] [stderr]    |                ^^^^^^^^^^^ method not found in `std::sync::Arc<T>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: could not compile `cowrc`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0599]: no method named `make_unique` found for struct `std::rc::Rc<T>` in the current scope
[INFO] [stderr]   --> src/lib.rs:42:16
[INFO] [stderr]    |
[INFO] [stderr] 42 |         self.v.make_unique()
[INFO] [stderr]    |                ^^^^^^^^^^^ method not found in `std::rc::Rc<T>`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `make_unique` found for struct `std::sync::Arc<T>` in the current scope
[INFO] [stderr]   --> src/lib.rs:55:16
[INFO] [stderr]    |
[INFO] [stderr] 55 |         self.v.make_unique()
[INFO] [stderr]    |                ^^^^^^^^^^^ method not found in `std::sync::Arc<T>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: could not compile `cowrc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f8d3dd83bac86276b6070b33d15d3073d32aa054251588338990174daea0162e"`
[INFO] running `"docker" "rm" "-f" "f8d3dd83bac86276b6070b33d15d3073d32aa054251588338990174daea0162e"`
[INFO] [stdout] f8d3dd83bac86276b6070b33d15d3073d32aa054251588338990174daea0162e