[INFO] fetching crate rustc-ap-rustc_attr 727.0.0...
[INFO] testing rustc-ap-rustc_attr-727.0.0 against try#d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2 for pr-86479
[INFO] extracting crate rustc-ap-rustc_attr 727.0.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate rustc-ap-rustc_attr 727.0.0 on toolchain d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rustc-ap-rustc_attr 727.0.0
[INFO] finished tweaking crates.io crate rustc-ap-rustc_attr 727.0.0
[INFO] tweaked toml for crates.io crate rustc-ap-rustc_attr 727.0.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e481c6c1a3e5f65060c22561f70cd718f0fade9a19ce6ee23b5cbf8975679bf3
[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" "e481c6c1a3e5f65060c22561f70cd718f0fade9a19ce6ee23b5cbf8975679bf3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e481c6c1a3e5f65060c22561f70cd718f0fade9a19ce6ee23b5cbf8975679bf3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e481c6c1a3e5f65060c22561f70cd718f0fade9a19ce6ee23b5cbf8975679bf3", kill_on_drop: false }`
[INFO] [stdout] e481c6c1a3e5f65060c22561f70cd718f0fade9a19ce6ee23b5cbf8975679bf3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3d12061ee4f31dcfc2a3fd4555198f21ffe6e7b7182987744fe7ecdfd512dbbd
[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" "3d12061ee4f31dcfc2a3fd4555198f21ffe6e7b7182987744fe7ecdfd512dbbd", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-ap-rustc_ast_pretty v727.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_session v727.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_attr v727.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: environment variable `CFG_RELEASE` not defined
[INFO] [stdout]    --> src/builtin.rs:594:47
[INFO] [stdout]     |
[INFO] [stdout] 594 |             let rustc_version = parse_version(env!("CFG_RELEASE"), true).unwrap();
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this error originates in the macro `env` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-ap-rustc_attr` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3d12061ee4f31dcfc2a3fd4555198f21ffe6e7b7182987744fe7ecdfd512dbbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d12061ee4f31dcfc2a3fd4555198f21ffe6e7b7182987744fe7ecdfd512dbbd", kill_on_drop: false }`
[INFO] [stdout] 3d12061ee4f31dcfc2a3fd4555198f21ffe6e7b7182987744fe7ecdfd512dbbd