[INFO] fetching crate json-trait-rs 0.11.0... [INFO] testing json-trait-rs-0.11.0 against beta-2021-09-08 for beta-1.56-1 [INFO] extracting crate json-trait-rs 0.11.0 into /workspace/builds/worker-8/source [INFO] validating manifest of crates.io crate json-trait-rs 0.11.0 on toolchain beta-2021-09-08 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] removed /workspace/builds/worker-8/source/rust-toolchain [INFO] started tweaking crates.io crate json-trait-rs 0.11.0 [INFO] finished tweaking crates.io crate json-trait-rs 0.11.0 [INFO] tweaked toml for crates.io crate json-trait-rs 0.11.0 written to /workspace/builds/worker-8/source/Cargo.toml [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }` [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded pyo3-macros v0.14.5 [INFO] [stderr] Downloaded serde_yaml v0.8.21 [INFO] [stderr] Downloaded pyo3 v0.14.5 [INFO] [stderr] Downloaded indoc-impl v0.3.6 [INFO] [stderr] Downloaded pyo3-build-config v0.14.5 [INFO] [stderr] Downloaded join-lazy-fmt v0.9.2 [INFO] [stderr] Downloaded strum v0.21.0 [INFO] [stderr] Downloaded indoc v0.3.6 [INFO] [stderr] Downloaded strum_macros v0.21.1 [INFO] [stderr] Downloaded pyo3-macros-backend v0.14.5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 0485c6708a83f5f356fe94e70f1926c479d51be862f5d1f39da08f97eac7a6d5 [INFO] running `Command { std: "docker" "start" "-a" "0485c6708a83f5f356fe94e70f1926c479d51be862f5d1f39da08f97eac7a6d5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "0485c6708a83f5f356fe94e70f1926c479d51be862f5d1f39da08f97eac7a6d5", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0485c6708a83f5f356fe94e70f1926c479d51be862f5d1f39da08f97eac7a6d5", kill_on_drop: false }` [INFO] [stdout] 0485c6708a83f5f356fe94e70f1926c479d51be862f5d1f39da08f97eac7a6d5 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 52b190845bbc94ed94e960d1a3bee7ac4cc2ed0942be882bf284c26a798130c9 [INFO] running `Command { std: "docker" "start" "-a" "52b190845bbc94ed94e960d1a3bee7ac4cc2ed0942be882bf284c26a798130c9", kill_on_drop: false }` [INFO] [stderr] Compiling join-lazy-fmt v0.9.2 [INFO] [stderr] Compiling strum_macros v0.21.1 [INFO] [stderr] Compiling failure v0.1.8 [INFO] [stderr] Compiling json-trait-rs v0.11.0 (/opt/rustwide/workdir) [INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel [INFO] [stdout] --> src/lib.rs:43:1 [INFO] [stdout] | [INFO] [stdout] 43 | #![feature(specialization)] [INFO] [stdout] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes [INFO] [stdout] --> src/lib.rs:43:12 [INFO] [stdout] | [INFO] [stdout] 43 | #![feature(specialization)] [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] note: the lint level is defined here [INFO] [stdout] --> src/lib.rs:37:5 [INFO] [stdout] | [INFO] [stdout] 37 | warnings, [INFO] [stdout] | ^^^^^^^^ [INFO] [stdout] = note: `#[warn(incomplete_features)]` implied by `#[warn(warnings)]` [INFO] [stdout] = note: see issue #31844 for more information [INFO] [stdout] = help: consider using `min_specialization` instead, which is more stable and complete [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: aborting due to previous error; 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] For more information about this error, try `rustc --explain E0554`. [INFO] [stdout] [INFO] [stderr] error: could not compile `json-trait-rs` due to 2 previous errors; 1 warning emitted [INFO] running `Command { std: "docker" "inspect" "52b190845bbc94ed94e960d1a3bee7ac4cc2ed0942be882bf284c26a798130c9", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "52b190845bbc94ed94e960d1a3bee7ac4cc2ed0942be882bf284c26a798130c9", kill_on_drop: false }` [INFO] [stdout] 52b190845bbc94ed94e960d1a3bee7ac4cc2ed0942be882bf284c26a798130c9