[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] checking MeetMon/MeetMon-BackEnd against master#bd0bacc694d7d8175804bb6f690cb846bfa4a9ee for pr-71665
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMeetMon%2FMeetMon-BackEnd" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MeetMon/MeetMon-BackEnd on toolchain bd0bacc694d7d8175804bb6f690cb846bfa4a9ee
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "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-4/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" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "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] 55cbbbd18834c9e57b42fb321f97dbf6cb15f88834f0b5e8e15141e054b45cb7
[INFO] running `"docker" "start" "-a" "55cbbbd18834c9e57b42fb321f97dbf6cb15f88834f0b5e8e15141e054b45cb7"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling yansi v0.4.0
[INFO] [stderr]     Checking safemem v0.2.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]    Compiling byteorder v1.2.4
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling percent-encoding v1.0.1
[INFO] [stderr]     Checking untrusted v0.6.2
[INFO] [stderr]     Checking ucd-util v0.1.1
[INFO] [stderr]    Compiling gcc v0.3.54
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]     Checking utf8-ranges v1.0.0
[INFO] [stderr]     Checking state v0.4.1
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]    Compiling indexmap v1.0.1
[INFO] [stderr]     Checking try_from v0.2.2
[INFO] [stderr]     Checking md5 v0.3.7
[INFO] [stderr]     Checking semver-parser v0.7.0
[INFO] [stderr]     Checking hex v0.3.2
[INFO] [stderr]     Checking separator v0.3.1
[INFO] [stderr]     Checking data-encoding v2.1.1
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]    Compiling ring v0.13.2
[INFO] [stderr]     Checking rand v0.5.4
[INFO] [stderr]    Compiling proc-macro2 v0.4.9
[INFO] [stderr]     Checking base64 v0.9.2
[INFO] [stderr]     Checking base64 v0.6.0
[INFO] [stderr]     Checking unreachable v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.5.6
[INFO] [stderr]    Compiling smallvec v0.6.3
[INFO] [stderr]     Checking semver v0.8.0
[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]     Checking thread_local v0.3.5
[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" "55cbbbd18834c9e57b42fb321f97dbf6cb15f88834f0b5e8e15141e054b45cb7"`
[INFO] running `"docker" "rm" "-f" "55cbbbd18834c9e57b42fb321f97dbf6cb15f88834f0b5e8e15141e054b45cb7"`
[INFO] [stdout] 55cbbbd18834c9e57b42fb321f97dbf6cb15f88834f0b5e8e15141e054b45cb7