[INFO] cloning repository https://github.com/JoshMcguigan/cost-of-indirection
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JoshMcguigan/cost-of-indirection" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshMcguigan%2Fcost-of-indirection", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshMcguigan%2Fcost-of-indirection'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9cb37bd172aa53fae36c0e55d6742839e8bcef02
[INFO] testing JoshMcguigan/cost-of-indirection against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJoshMcguigan%2Fcost-of-indirection" "/workspace/builds/worker-19/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-19/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JoshMcguigan/cost-of-indirection on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JoshMcguigan/cost-of-indirection
[INFO] finished tweaking git repo https://github.com/JoshMcguigan/cost-of-indirection
[INFO] tweaked toml for git repo https://github.com/JoshMcguigan/cost-of-indirection written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] crate git repo https://github.com/JoshMcguigan/cost-of-indirection already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 600778d86e4daea537df72c8df9d6f066f59acc039bc3c24801bdcdcb2320cac
[INFO] running `Command { std: "docker" "start" "-a" "600778d86e4daea537df72c8df9d6f066f59acc039bc3c24801bdcdcb2320cac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "600778d86e4daea537df72c8df9d6f066f59acc039bc3c24801bdcdcb2320cac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "600778d86e4daea537df72c8df9d6f066f59acc039bc3c24801bdcdcb2320cac", kill_on_drop: false }`
[INFO] [stdout] 600778d86e4daea537df72c8df9d6f066f59acc039bc3c24801bdcdcb2320cac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92b27747e5b33ee6c3bedd75a9bfb37eb0db523a6fb0c6cb29a644b0f5886f17
[INFO] running `Command { std: "docker" "start" "-a" "92b27747e5b33ee6c3bedd75a9bfb37eb0db523a6fb0c6cb29a644b0f5886f17", kill_on_drop: false }`
[INFO] [stderr]    Compiling cost-of-indirection v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> src/bin/trait_object_black_box.rs:10:31
[INFO] [stdout]    |
[INFO] [stdout] 10 |     let result = find_nth_odd(std::hint::black_box::<&dyn OddFinder>(&finder), 1_000_000_000);
[INFO] [stdout]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout]    = help: add `#![feature(bench_black_box)]` 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 `cost-of-indirection` 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" "92b27747e5b33ee6c3bedd75a9bfb37eb0db523a6fb0c6cb29a644b0f5886f17", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92b27747e5b33ee6c3bedd75a9bfb37eb0db523a6fb0c6cb29a644b0f5886f17", kill_on_drop: false }`
[INFO] [stdout] 92b27747e5b33ee6c3bedd75a9bfb37eb0db523a6fb0c6cb29a644b0f5886f17