[INFO] cloning repository https://github.com/caente/coursera_graphs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/caente/coursera_graphs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaente%2Fcoursera_graphs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaente%2Fcoursera_graphs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a9816c0618c7bdf018b1cbc44f7bbf39fa88bc6a
[INFO] testing caente/coursera_graphs against 1.47.0 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaente%2Fcoursera_graphs" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] [stderr] Checking out files:  32% (8/25)   
Checking out files:  36% (9/25)   
Checking out files:  40% (10/25)   
Checking out files:  44% (11/25)   
Checking out files:  48% (12/25)   
Checking out files:  52% (13/25)   
Checking out files:  56% (14/25)   
Checking out files:  60% (15/25)   
Checking out files:  64% (16/25)   
Checking out files:  68% (17/25)   
Checking out files:  72% (18/25)   
Checking out files:  76% (19/25)   
Checking out files:  80% (20/25)   
Checking out files:  84% (21/25)   
Checking out files:  88% (22/25)   
Checking out files:  92% (23/25)   
Checking out files:  96% (24/25)   
Checking out files: 100% (25/25)   
Checking out files: 100% (25/25), done.
[INFO] validating manifest of git repo https://github.com/caente/coursera_graphs on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/caente/coursera_graphs
[INFO] finished tweaking git repo https://github.com/caente/coursera_graphs
[INFO] tweaked toml for git repo https://github.com/caente/coursera_graphs written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/caente/coursera_graphs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b08d145cdfff3c944f3567718bce658eeaa4aa079a92e81ba23677532dbd958b
[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" "b08d145cdfff3c944f3567718bce658eeaa4aa079a92e81ba23677532dbd958b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b08d145cdfff3c944f3567718bce658eeaa4aa079a92e81ba23677532dbd958b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b08d145cdfff3c944f3567718bce658eeaa4aa079a92e81ba23677532dbd958b", kill_on_drop: false }`
[INFO] [stdout] b08d145cdfff3c944f3567718bce658eeaa4aa079a92e81ba23677532dbd958b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f29011174f3835564d92a0822698f3fb3dd7d88aeafb4e92e9984061bddc4b07
[INFO] running `Command { std: "docker" "start" "-a" "f29011174f3835564d92a0822698f3fb3dd7d88aeafb4e92e9984061bddc4b07", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling graphs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[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 `graphs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "f29011174f3835564d92a0822698f3fb3dd7d88aeafb4e92e9984061bddc4b07", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f29011174f3835564d92a0822698f3fb3dd7d88aeafb4e92e9984061bddc4b07", kill_on_drop: false }`
[INFO] [stdout] f29011174f3835564d92a0822698f3fb3dd7d88aeafb4e92e9984061bddc4b07
