[INFO] fetching crate potpack 0.1.2...
[INFO] checking potpack-0.1.2 against master#783139bd8fc3b94fac9a1bf81bba2c506e8221b6 for pr-72644
[INFO] extracting crate potpack 0.1.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate potpack 0.1.2 on toolchain 783139bd8fc3b94fac9a1bf81bba2c506e8221b6
[INFO] running `"/workspace/cargo-home/bin/cargo" "+783139bd8fc3b94fac9a1bf81bba2c506e8221b6" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate potpack 0.1.2
[INFO] finished tweaking crates.io crate potpack 0.1.2
[INFO] tweaked toml for crates.io crate potpack 0.1.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate potpack 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+783139bd8fc3b94fac9a1bf81bba2c506e8221b6" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "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" "+783139bd8fc3b94fac9a1bf81bba2c506e8221b6" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 54013c2e926ddf1b673a3285d6324293733140099373676da1d1b9671b62f22b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "54013c2e926ddf1b673a3285d6324293733140099373676da1d1b9671b62f22b"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking potpack v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `PotPack`, `SizedItem`, `approx_eq`
[INFO] [stderr]    --> src/lib.rs:192:9
[INFO] [stderr]     |
[INFO] [stderr] 192 |         approx_eq,
[INFO] [stderr]     |         ^^^^^^^^^
[INFO] [stderr] 193 |         PotPack,
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr] 194 |         SizedItem
[INFO] [stderr]     |         ^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `spaces` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/lib.rs:155:21
[INFO] [stderr]     |
[INFO] [stderr] 104 |             for (i, space) in spaces.iter().enumerate().rev() {
[INFO] [stderr]     |                               ------ immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 155 |                     spaces.push(Space {
[INFO] [stderr]     |                     ^^^^^^ mutable borrow occurs here
[INFO] [stderr] 156 |                         id: space.id,
[INFO] [stderr]     |                             -------- immutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `spaces` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/lib.rs:155:21
[INFO] [stderr]     |
[INFO] [stderr] 104 |             for (i, space) in spaces.iter().enumerate().rev() {
[INFO] [stderr]     |                               ------ immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 155 |                     spaces.push(Space {
[INFO] [stderr]     |                     ^^^^^^ mutable borrow occurs here
[INFO] [stderr] 156 |                         id: space.id,
[INFO] [stderr]     |                             -------- immutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.30s
[INFO] running `"docker" "inspect" "54013c2e926ddf1b673a3285d6324293733140099373676da1d1b9671b62f22b"`
[INFO] running `"docker" "rm" "-f" "54013c2e926ddf1b673a3285d6324293733140099373676da1d1b9671b62f22b"`
[INFO] [stdout] 54013c2e926ddf1b673a3285d6324293733140099373676da1d1b9671b62f22b