[INFO] fetching crate backtrace 0.3.50...
[INFO] checking backtrace-0.3.50 against beta-2020-07-24 for pr-75494-beta
[INFO] extracting crate backtrace 0.3.50 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate backtrace 0.3.50 on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate backtrace 0.3.50
[INFO] removed 0 missing examples
[INFO] removed 1 missing tests
[INFO] finished tweaking crates.io crate backtrace 0.3.50
[INFO] tweaked toml for crates.io crate backtrace 0.3.50 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate backtrace 0.3.50 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0d68a9a16215ea953e30787ddffe1d76505d4b377738f5d425bc00e0d0c15c31
[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" "0d68a9a16215ea953e30787ddffe1d76505d4b377738f5d425bc00e0d0c15c31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0d68a9a16215ea953e30787ddffe1d76505d4b377738f5d425bc00e0d0c15c31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0d68a9a16215ea953e30787ddffe1d76505d4b377738f5d425bc00e0d0c15c31", kill_on_drop: false }`
[INFO] [stdout] 0d68a9a16215ea953e30787ddffe1d76505d4b377738f5d425bc00e0d0c15c31
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7dc55f3eb7be170bbe7920c29eb1fa433c6cebde4da879e535d2fa7a0f075d06
[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" "7dc55f3eb7be170bbe7920c29eb1fa433c6cebde4da879e535d2fa7a0f075d06", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.71
[INFO] [stderr]     Checking adler v0.2.2
[INFO] [stderr]    Compiling libloading v0.6.2
[INFO] [stderr]     Checking rustc-demangle v0.1.16
[INFO] [stderr]     Checking miniz_oxide v0.4.0
[INFO] [stderr]     Checking backtrace v0.3.50 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> benches/benchmarks.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `backtrace`.
[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 `Command { std: "docker" "inspect" "7dc55f3eb7be170bbe7920c29eb1fa433c6cebde4da879e535d2fa7a0f075d06", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7dc55f3eb7be170bbe7920c29eb1fa433c6cebde4da879e535d2fa7a0f075d06", kill_on_drop: false }`
[INFO] [stdout] 7dc55f3eb7be170bbe7920c29eb1fa433c6cebde4da879e535d2fa7a0f075d06
