[INFO] fetching crate modus_ponens_derive 0.1.3...
[INFO] checking modus_ponens_derive-0.1.3 against 1.95.0 for pr-155915
[INFO] extracting crate modus_ponens_derive 0.1.3 into /workspace/builds/worker-4-tc1/source
[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-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate modus_ponens_derive 0.1.3 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 39 packages to latest compatible versions
[INFO] [stderr]       Adding generic-array v0.14.7 (available: v0.14.9)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "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-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 65927bdbba16647a3fc5b825baa29b374c5f42e280ee8b98eb41e0b3a19edb2d
[INFO] running `Command { std: "docker" "start" "-a" "65927bdbba16647a3fc5b825baa29b374c5f42e280ee8b98eb41e0b3a19edb2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "65927bdbba16647a3fc5b825baa29b374c5f42e280ee8b98eb41e0b3a19edb2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65927bdbba16647a3fc5b825baa29b374c5f42e280ee8b98eb41e0b3a19edb2d", kill_on_drop: false }`
[INFO] [stdout] 65927bdbba16647a3fc5b825baa29b374c5f42e280ee8b98eb41e0b3a19edb2d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0514f93548490a0d1cf0dcd59532519c12c938d81803c97366429b518f340b4c
[INFO] running `Command { std: "docker" "start" "-a" "0514f93548490a0d1cf0dcd59532519c12c938d81803c97366429b518f340b4c", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.8.0
[INFO] [stderr]     Checking regex-syntax v0.8.10
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking log v0.4.29
[INFO] [stderr]     Checking termcolor v1.4.1
[INFO] [stderr]     Checking ucd-trie v0.1.7
[INFO] [stderr]     Checking libc v0.2.186
[INFO] [stderr]    Compiling pest_generator v2.8.6
[INFO] [stderr]     Checking humantime v1.3.0
[INFO] [stderr]     Checking aho-corasick v1.1.4
[INFO] [stderr]     Checking pest v2.8.6
[INFO] [stderr]    Compiling pest_derive v2.8.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking regex-automata v0.4.14
[INFO] [stderr]     Checking regex v1.12.3
[INFO] [stderr]     Checking env_logger v0.7.1
[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/index.crates.io-1949cf8c6b5b557f/modus_ponens-0.11.5/src/lib.rs:42:1
[INFO] [stdout]    |
[INFO] [stdout] 42 | #![feature(hash_set_entry)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `modus_ponens` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "0514f93548490a0d1cf0dcd59532519c12c938d81803c97366429b518f340b4c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0514f93548490a0d1cf0dcd59532519c12c938d81803c97366429b518f340b4c", kill_on_drop: false }`
[INFO] [stdout] 0514f93548490a0d1cf0dcd59532519c12c938d81803c97366429b518f340b4c