[INFO] cloning repository https://github.com/nelhage/feature-in-mod
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nelhage/feature-in-mod" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnelhage%2Ffeature-in-mod", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnelhage%2Ffeature-in-mod'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ceb2d2e6646635f5161c3a99739889e4d0092eef
[INFO] checking nelhage/feature-in-mod against master#b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18 for pr-79470
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnelhage%2Ffeature-in-mod" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nelhage/feature-in-mod on toolchain b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nelhage/feature-in-mod
[INFO] finished tweaking git repo https://github.com/nelhage/feature-in-mod
[INFO] tweaked toml for git repo https://github.com/nelhage/feature-in-mod written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/nelhage/feature-in-mod already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "metadata" "--no-deps" "--format-version=1", 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] 387c628ea907e07fe54cc3c8a7f2bb1d539ad917eb24f37883c497b279ac5d7b
[INFO] running `Command { std: "docker" "start" "-a" "387c628ea907e07fe54cc3c8a7f2bb1d539ad917eb24f37883c497b279ac5d7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "387c628ea907e07fe54cc3c8a7f2bb1d539ad917eb24f37883c497b279ac5d7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "387c628ea907e07fe54cc3c8a7f2bb1d539ad917eb24f37883c497b279ac5d7b", kill_on_drop: false }`
[INFO] [stdout] 387c628ea907e07fe54cc3c8a7f2bb1d539ad917eb24f37883c497b279ac5d7b
[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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+b7ebc6b0c1ba3c27ebb17c0b496ece778ef11e18" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6a1300731fcfdc222a0b7e2d0758147f079ac6cd22a8965977599902d5aa4f81
[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" "6a1300731fcfdc222a0b7e2d0758147f079ac6cd22a8965977599902d5aa4f81", kill_on_drop: false }`
[INFO] [stderr]     Checking feature-in-mod v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0658]: box pattern syntax is experimental
[INFO] [stdout]  --> src/transform.rs:7:18
[INFO] [stdout]   |
[INFO] [stdout] 7 |         AST::Add(box AST::Add(ll, lr), r) => AST::Add(ll, Box::new(AST::Add(lr, r))),
[INFO] [stdout]   |                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29641 <https://github.com/rust-lang/rust/issues/29641> for more information
[INFO] [stdout]   = help: add `#![feature(box_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: box pattern syntax is experimental
[INFO] [stdout]  --> src/transform.rs:7:18
[INFO] [stdout]   |
[INFO] [stdout] 7 |         AST::Add(box AST::Add(ll, lr), r) => AST::Add(ll, Box::new(AST::Add(lr, r))),
[INFO] [stdout]   |                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #29641 <https://github.com/rust-lang/rust/issues/29641> for more information
[INFO] [stdout]   = help: add `#![feature(box_patterns)]` to the crate attributes to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `feature-in-mod`
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stdout] For more information about this error, try `rustc --explain E0658`.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "6a1300731fcfdc222a0b7e2d0758147f079ac6cd22a8965977599902d5aa4f81", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a1300731fcfdc222a0b7e2d0758147f079ac6cd22a8965977599902d5aa4f81", kill_on_drop: false }`
[INFO] [stdout] 6a1300731fcfdc222a0b7e2d0758147f079ac6cd22a8965977599902d5aa4f81