[INFO] fetching crate lain 0.5.3... [INFO] testing lain-0.5.3 against 1.49.0 for beta-1.50-1 [INFO] extracting crate lain 0.5.3 into /workspace/builds/worker-11/source [INFO] validating manifest of crates.io crate lain 0.5.3 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 lain 0.5.3 [INFO] finished tweaking crates.io crate lain 0.5.3 [INFO] tweaked toml for crates.io crate lain 0.5.3 written to /workspace/builds/worker-11/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-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 0ab0492f38d4ce362c350dbc1b87f5ba07e1766b32201d785ac51dabae0949c3 [INFO] running `Command { std: "docker" "start" "-a" "0ab0492f38d4ce362c350dbc1b87f5ba07e1766b32201d785ac51dabae0949c3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "0ab0492f38d4ce362c350dbc1b87f5ba07e1766b32201d785ac51dabae0949c3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0ab0492f38d4ce362c350dbc1b87f5ba07e1766b32201d785ac51dabae0949c3", kill_on_drop: false }` [INFO] [stdout] 0ab0492f38d4ce362c350dbc1b87f5ba07e1766b32201d785ac51dabae0949c3 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] d7b4d6375248b2506542b13ef6e4297cd8068cded5aa1da2e70bbd49c8f36457 [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" "d7b4d6375248b2506542b13ef6e4297cd8068cded5aa1da2e70bbd49c8f36457", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro-hack-impl v0.4.2 [INFO] [stderr] Compiling getrandom v0.1.16 [INFO] [stderr] Compiling field-offset v0.3.2 [INFO] [stderr] Compiling num-complex v0.2.4 [INFO] [stderr] Compiling num-bigint v0.2.6 [INFO] [stderr] Compiling num-iter v0.1.42 [INFO] [stderr] Compiling num-derive v0.2.5 [INFO] [stderr] Compiling rand_core v0.5.1 [INFO] [stderr] Compiling proc-macro-hack v0.4.2 [INFO] [stderr] Compiling rand_pcg v0.2.1 [INFO] [stderr] Compiling rand_chacha v0.2.2 [INFO] [stderr] Compiling mashup-impl v0.1.12 [INFO] [stderr] Compiling rand v0.7.3 [INFO] [stderr] Compiling mashup v0.1.12 [INFO] [stderr] Compiling num-rational v0.2.4 [INFO] [stderr] Compiling lain_derive v0.5.3 [INFO] [stderr] Compiling num v0.2.1 [INFO] [stderr] Compiling lain v0.5.3 (/opt/rustwide/workdir) [INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel [INFO] [stdout] --> src/lib.rs:101:1 [INFO] [stdout] | [INFO] [stdout] 101 | #![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:101:12 [INFO] [stdout] | [INFO] [stdout] 101 | #![feature(specialization)] [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(incomplete_features)]` on by default [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 `lain` [INFO] [stderr] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] running `Command { std: "docker" "inspect" "d7b4d6375248b2506542b13ef6e4297cd8068cded5aa1da2e70bbd49c8f36457", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d7b4d6375248b2506542b13ef6e4297cd8068cded5aa1da2e70bbd49c8f36457", kill_on_drop: false }` [INFO] [stdout] d7b4d6375248b2506542b13ef6e4297cd8068cded5aa1da2e70bbd49c8f36457