[INFO] updating cached repository https://github.com/sisshiki1969/ruruby
[INFO] running `Command { std: "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", kill_on_drop: false }`
[INFO] [stderr] From https://github.com/sisshiki1969/ruruby
[INFO] [stderr]    e28c391..6cd7371  master     -> master
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6cd7371d84ca46e3fefb1e3200d2d708205fb3e2
[INFO] checking sisshiki1969/ruruby against master#1557fb031b272b4c5bfcc7de5df7eddc7b36a584 for pr-73166
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsisshiki1969%2Fruruby" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sisshiki1969/ruruby on toolchain 1557fb031b272b4c5bfcc7de5df7eddc7b36a584
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sisshiki1969/ruruby
[INFO] finished tweaking git repo https://github.com/sisshiki1969/ruruby
[INFO] tweaked toml for git repo https://github.com/sisshiki1969/ruruby written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/sisshiki1969/ruruby already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "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_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fa01f88a4ae666ca3a8af9b433adeb22388d2ffe454dccd442bfd7a795fa774c
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fa01f88a4ae666ca3a8af9b433adeb22388d2ffe454dccd442bfd7a795fa774c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fa01f88a4ae666ca3a8af9b433adeb22388d2ffe454dccd442bfd7a795fa774c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa01f88a4ae666ca3a8af9b433adeb22388d2ffe454dccd442bfd7a795fa774c", kill_on_drop: false }`
[INFO] [stdout] fa01f88a4ae666ca3a8af9b433adeb22388d2ffe454dccd442bfd7a795fa774c
[INFO] running `Command { std: "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=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@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+1557fb031b272b4c5bfcc7de5df7eddc7b36a584" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9e7d119337ebe01fa1f1b5872d75d39405e6adb826f3604a29b18bf5d97eaab1
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9e7d119337ebe01fa1f1b5872d75d39405e6adb826f3604a29b18bf5d97eaab1", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking bit-vec v0.6.2
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking unicode-segmentation v1.6.0
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking utf8parse v0.2.0
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]     Checking divrem v0.1.0
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking bit-set v0.5.2
[INFO] [stderr]     Checking aho-corasick v0.7.10
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking dirs-sys-next v0.1.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]     Checking dirs-next v1.0.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking fancy-regex v0.3.5
[INFO] [stderr]     Checking rustyline v6.2.0
[INFO] [stderr]     Checking ruruby v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'leading_trailing_ones'
[INFO] [stdout]    --> src/alloc.rs:385:23
[INFO] [stdout]     |
[INFO] [stdout] 385 |         let min = map.trailing_ones() as usize;
[INFO] [stdout]     |                       ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #57969 <https://github.com/rust-lang/rust/issues/57969> for more information
[INFO] [stdout]     = help: add `#![feature(leading_trailing_ones)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'leading_trailing_ones'
[INFO] [stdout]    --> src/alloc.rs:385:23
[INFO] [stdout]     |
[INFO] [stdout] 385 |         let min = map.trailing_ones() as usize;
[INFO] [stdout]     |                       ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: see issue #57969 <https://github.com/rust-lang/rust/issues/57969> for more information
[INFO] [stdout]     = help: add `#![feature(leading_trailing_ones)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ruruby`.
[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] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9e7d119337ebe01fa1f1b5872d75d39405e6adb826f3604a29b18bf5d97eaab1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e7d119337ebe01fa1f1b5872d75d39405e6adb826f3604a29b18bf5d97eaab1", kill_on_drop: false }`
[INFO] [stdout] 9e7d119337ebe01fa1f1b5872d75d39405e6adb826f3604a29b18bf5d97eaab1