[INFO] fetching crate emitter 0.0.1...
[INFO] testing emitter-0.0.1 against 1.49.0 for beta-1.50-1
[INFO] extracting crate emitter 0.0.1 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate emitter 0.0.1 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate emitter 0.0.1
[INFO] finished tweaking crates.io crate emitter 0.0.1
[INFO] tweaked toml for crates.io crate emitter 0.0.1 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e428d610d5e86c4a24e89a353c359fe4e890cc3bd9b55d9aed77f247466206f0
[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" "e428d610d5e86c4a24e89a353c359fe4e890cc3bd9b55d9aed77f247466206f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e428d610d5e86c4a24e89a353c359fe4e890cc3bd9b55d9aed77f247466206f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e428d610d5e86c4a24e89a353c359fe4e890cc3bd9b55d9aed77f247466206f0", kill_on_drop: false }`
[INFO] [stdout] e428d610d5e86c4a24e89a353c359fe4e890cc3bd9b55d9aed77f247466206f0
[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=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:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f2462a920bdddd7db514f797b1fdfaceeb1fb115df7ae06b2526dd57d9db60d
[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" "4f2462a920bdddd7db514f797b1fdfaceeb1fb115df7ae06b2526dd57d9db60d", kill_on_drop: false }`
[INFO] [stderr]    Compiling emitter v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: expected one of `,`, `:`, `=`, or `>`, found `?`
[INFO] [stdout]   --> src/lib.rs:13:22
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub trait Event<Sized? X>: 'static {}
[INFO] [stdout]    |                      ^ expected one of `,`, `:`, `=`, or `>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `emitter`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "4f2462a920bdddd7db514f797b1fdfaceeb1fb115df7ae06b2526dd57d9db60d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f2462a920bdddd7db514f797b1fdfaceeb1fb115df7ae06b2526dd57d9db60d", kill_on_drop: false }`
[INFO] [stdout] 4f2462a920bdddd7db514f797b1fdfaceeb1fb115df7ae06b2526dd57d9db60d