[INFO] fetching crate psp 0.1.3...
[INFO] testing psp-0.1.3 against 1.49.0 for beta-1.50-1
[INFO] extracting crate psp 0.1.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate psp 0.1.3 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 psp 0.1.3
[INFO] finished tweaking crates.io crate psp 0.1.3
[INFO] tweaked toml for crates.io crate psp 0.1.3 written to /workspace/builds/worker-4/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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] d64f26b41eaf7c85bec578f1a076bd446dcbf03822f3b5f97a830ce8f780352d
[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" "d64f26b41eaf7c85bec578f1a076bd446dcbf03822f3b5f97a830ce8f780352d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d64f26b41eaf7c85bec578f1a076bd446dcbf03822f3b5f97a830ce8f780352d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d64f26b41eaf7c85bec578f1a076bd446dcbf03822f3b5f97a830ce8f780352d", kill_on_drop: false }`
[INFO] [stdout] d64f26b41eaf7c85bec578f1a076bd446dcbf03822f3b5f97a830ce8f780352d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 35146647e3949444ac366ae2a2c9c8a8ba3b8f6366ffd7c60891edec72d894e2
[INFO] running `Command { std: "docker" "start" "-a" "35146647e3949444ac366ae2a2c9c8a8ba3b8f6366ffd7c60891edec72d894e2", kill_on_drop: false }`
[INFO] [stderr]    Compiling psp v0.1.3 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling derivative v2.1.3
[INFO] [stderr]    Compiling num_enum_derive v0.5.1
[INFO] [stderr]    Compiling num_enum v0.5.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:2:1
[INFO] [stdout]    |
[INFO] [stdout] 2  | / #![feature(
[INFO] [stdout] 3  | |     alloc_error_handler,
[INFO] [stdout] 4  | |     llvm_asm,
[INFO] [stdout] 5  | |     global_asm,
[INFO] [stdout] ...  |
[INFO] [stdout] 12 | |     lang_items,
[INFO] [stdout] 13 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:16:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(std_internals, panic_info_message, panic_internals, unwind_attributes)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:17:41
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![cfg_attr(not(feature = "stub-only"), feature(panic_unwind))]
[INFO] [stdout]    |                                         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `psp`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "35146647e3949444ac366ae2a2c9c8a8ba3b8f6366ffd7c60891edec72d894e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "35146647e3949444ac366ae2a2c9c8a8ba3b8f6366ffd7c60891edec72d894e2", kill_on_drop: false }`
[INFO] [stdout] 35146647e3949444ac366ae2a2c9c8a8ba3b8f6366ffd7c60891edec72d894e2