[INFO] updating cached repository https://github.com/MeetMon/MeetMon-BackEnd
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 754b3734cc852cf50dc4e81a604ff6baf60a0660
[INFO] testing MeetMon/MeetMon-BackEnd against master#28742a1146f10a4f09369baad027a464acb7a766 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMeetMon%2FMeetMon-BackEnd" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MeetMon/MeetMon-BackEnd on toolchain 28742a1146f10a4f09369baad027a464acb7a766
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/MeetMon/MeetMon-BackEnd
[INFO] finished tweaking git repo https://github.com/MeetMon/MeetMon-BackEnd
[INFO] tweaked toml for git repo https://github.com/MeetMon/MeetMon-BackEnd written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/MeetMon/MeetMon-BackEnd already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+28742a1146f10a4f09369baad027a464acb7a766" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+28742a1146f10a4f09369baad027a464acb7a766" "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] 5e1b99f82f43bc493390887d5d46f5d82ecba8017cd08900dc643367e9d36f0f
[INFO] running `"docker" "start" "-a" "5e1b99f82f43bc493390887d5d46f5d82ecba8017cd08900dc643367e9d36f0f"`
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling lazy_static v1.0.2
[INFO] [stderr]    Compiling serde v1.0.70
[INFO] [stderr]    Compiling cc v1.0.18
[INFO] [stderr]    Compiling cfg-if v0.1.4
[INFO] [stderr]    Compiling unicode-normalization v0.1.7
[INFO] [stderr]    Compiling indexmap v1.0.1
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]    Compiling httparse v1.3.2
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling language-tags v0.2.2
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling itoa v0.4.2
[INFO] [stderr]    Compiling dtoa v0.4.3
[INFO] [stderr]    Compiling rand_core v0.2.1
[INFO] [stderr]    Compiling utf8-ranges v1.0.0
[INFO] [stderr]    Compiling try_from v0.2.2
[INFO] [stderr]    Compiling hex v0.3.2
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling md5 v0.3.7
[INFO] [stderr]    Compiling linked-hash-map v0.5.1
[INFO] [stderr]    Compiling bufstream v0.1.3
[INFO] [stderr]    Compiling data-encoding v2.1.1
[INFO] [stderr]    Compiling separator v0.3.1
[INFO] [stderr]    Compiling bitflags v1.0.3
[INFO] [stderr]    Compiling time v0.1.40
[INFO] [stderr]    Compiling base64 v0.9.2
[INFO] [stderr]    Compiling memchr v2.0.1
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling base64 v0.6.0
[INFO] [stderr]    Compiling isatty v0.1.8
[INFO] [stderr]    Compiling hostname v0.1.5
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling log v0.4.3
[INFO] [stderr]    Compiling unreachable v1.0.0
[INFO] [stderr]    Compiling regex-syntax v0.5.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.9
[INFO] [stderr]    Compiling semver v0.8.0
[INFO] [stderr]    Compiling rand v0.5.4
[INFO] [stderr]    Compiling rand v0.3.22
[INFO] [stderr] error[E0658]: use of unstable library feature 'proc_macro_def_site'
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.9/src/unstable.rs:347:27
[INFO] [stderr]     |
[INFO] [stderr] 347 |             Span::Nightly(proc_macro::Span::def_site())
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: see issue #54724 <https://github.com/rust-lang/rust/issues/54724> for more information
[INFO] [stderr]     = help: add `#![feature(proc_macro_def_site)]` to the crate attributes to enable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0658`.
[INFO] [stderr] error: could not compile `proc-macro2`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "5e1b99f82f43bc493390887d5d46f5d82ecba8017cd08900dc643367e9d36f0f"`
[INFO] running `"docker" "rm" "-f" "5e1b99f82f43bc493390887d5d46f5d82ecba8017cd08900dc643367e9d36f0f"`
[INFO] [stdout] 5e1b99f82f43bc493390887d5d46f5d82ecba8017cd08900dc643367e9d36f0f