[INFO] fetching crate qcollect-traits 0.7.4...
[INFO] testing qcollect-traits-0.7.4 against 1.44.0 for beta-1.45-1
[INFO] extracting crate qcollect-traits 0.7.4 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate qcollect-traits 0.7.4 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate qcollect-traits 0.7.4
[INFO] finished tweaking crates.io crate qcollect-traits 0.7.4
[INFO] tweaked toml for crates.io crate qcollect-traits 0.7.4 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 09dd33ae973eecbcee3f5996a2fdbeb2f7fc0b0e1cc8db1648f189f73f2363c7
[INFO] running `"docker" "start" "-a" "09dd33ae973eecbcee3f5996a2fdbeb2f7fc0b0e1cc8db1648f189f73f2363c7"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling bit-vec v0.4.4
[INFO] [stderr]    Compiling vec_map v0.3.0
[INFO] [stderr]    Compiling qcollect-traits v0.7.4 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> src/lib.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | / #![feature(
[INFO] [stderr] 52 | |     associated_type_defaults,
[INFO] [stderr] 53 | |     collections, 
[INFO] [stderr] 54 | |     collections_bound, 
[INFO] [stderr] 55 | |     btree_range, 
[INFO] [stderr] 56 | |     drain,
[INFO] [stderr] 57 | | )]
[INFO] [stderr]    | |__^
[INFO] [stderr] 
[INFO] [stderr] error[E0061]: this function takes 1 argument but 0 arguments were supplied
[INFO] [stderr]   --> src/impls/vec_deque.rs:51:14
[INFO] [stderr]    |
[INFO] [stderr] 51 |         self.drain()
[INFO] [stderr]    |              ^^^^^- supplied 0 arguments
[INFO] [stderr]    |              |
[INFO] [stderr]    |              expected 1 argument
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0061, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0061`.
[INFO] [stderr] error: could not compile `qcollect-traits`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "09dd33ae973eecbcee3f5996a2fdbeb2f7fc0b0e1cc8db1648f189f73f2363c7"`
[INFO] running `"docker" "rm" "-f" "09dd33ae973eecbcee3f5996a2fdbeb2f7fc0b0e1cc8db1648f189f73f2363c7"`
[INFO] [stdout] 09dd33ae973eecbcee3f5996a2fdbeb2f7fc0b0e1cc8db1648f189f73f2363c7