[INFO] crate from_error_scope 0.0.1 is already in cache
[INFO] testing from_error_scope-0.0.1 against 1.44.0 for beta-1.45-1
[INFO] extracting crate from_error_scope 0.0.1 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate from_error_scope 0.0.1 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 from_error_scope 0.0.1
[INFO] finished tweaking crates.io crate from_error_scope 0.0.1
[INFO] tweaked toml for crates.io crate from_error_scope 0.0.1 written to /workspace/builds/worker-4/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-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=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] 3d4dbe5f54fd22c6428cb9a25a45b730c249069162a08b7a7b5c5755cec8c959
[INFO] running `"docker" "start" "-a" "3d4dbe5f54fd22c6428cb9a25a45b730c249069162a08b7a7b5c5755cec8c959"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling from_error_scope v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `"docker" "inspect" "3d4dbe5f54fd22c6428cb9a25a45b730c249069162a08b7a7b5c5755cec8c959"`
[INFO] running `"docker" "rm" "-f" "3d4dbe5f54fd22c6428cb9a25a45b730c249069162a08b7a7b5c5755cec8c959"`
[INFO] [stdout] 3d4dbe5f54fd22c6428cb9a25a45b730c249069162a08b7a7b5c5755cec8c959
[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=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" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 87343a0f6e4a851b8d4fc3372188f91854684b484e8d6d0268d2fe4cadfe7b06
[INFO] running `"docker" "start" "-a" "87343a0f6e4a851b8d4fc3372188f91854684b484e8d6d0268d2fe4cadfe7b06"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling from_error_scope v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::io::CharsError`
[INFO] [stderr]   --> examples/simple.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 | use std::io::CharsError;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^ no `CharsError` in `io`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]   --> examples/simple.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(core, io)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: could not compile `from_error_scope`.
[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" "87343a0f6e4a851b8d4fc3372188f91854684b484e8d6d0268d2fe4cadfe7b06"`
[INFO] running `"docker" "rm" "-f" "87343a0f6e4a851b8d4fc3372188f91854684b484e8d6d0268d2fe4cadfe7b06"`
[INFO] [stdout] 87343a0f6e4a851b8d4fc3372188f91854684b484e8d6d0268d2fe4cadfe7b06