[INFO] fetching crate modus_ponens_derive 0.1.3...
[INFO] documenting modus_ponens_derive-0.1.3 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate modus_ponens_derive 0.1.3 into /workspace/builds/worker-39/source
[INFO] validating manifest of crates.io crate modus_ponens_derive 0.1.3 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate modus_ponens_derive 0.1.3
[INFO] finished tweaking crates.io crate modus_ponens_derive 0.1.3
[INFO] tweaked toml for crates.io crate modus_ponens_derive 0.1.3 written to /workspace/builds/worker-39/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded modus_ponens v0.11.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6bc66d5e4cf884352663bd4da5a54e706f582c4d663b89a6c15f0fb6207249ac
[INFO] running `Command { std: "docker" "start" "-a" "6bc66d5e4cf884352663bd4da5a54e706f582c4d663b89a6c15f0fb6207249ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6bc66d5e4cf884352663bd4da5a54e706f582c4d663b89a6c15f0fb6207249ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6bc66d5e4cf884352663bd4da5a54e706f582c4d663b89a6c15f0fb6207249ac", kill_on_drop: false }`
[INFO] [stdout] 6bc66d5e4cf884352663bd4da5a54e706f582c4d663b89a6c15f0fb6207249ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-39/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" "RUSTDOCFLAGS=--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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6999f55237c70968d313535a6eb3039467716a4b1be00c2023448bdbf1c20084
[INFO] running `Command { std: "docker" "start" "-a" "6999f55237c70968d313535a6eb3039467716a4b1be00c2023448bdbf1c20084", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking quote v1.0.18
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]     Checking modus_ponens v0.11.5
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/modus_ponens-0.11.5/src/lib.rs:42:12
[INFO] [stdout]    |
[INFO] [stdout] 42 | #![feature(hash_set_entry)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `modus_ponens` due to 2 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "6999f55237c70968d313535a6eb3039467716a4b1be00c2023448bdbf1c20084", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6999f55237c70968d313535a6eb3039467716a4b1be00c2023448bdbf1c20084", kill_on_drop: false }`
[INFO] [stdout] 6999f55237c70968d313535a6eb3039467716a4b1be00c2023448bdbf1c20084