[INFO] fetching crate include_optional 1.0.1...
[INFO] testing include_optional-1.0.1 against 1.60.0 for beta-1.61-1
[INFO] extracting crate include_optional 1.0.1 into /workspace/builds/worker-48/source
[INFO] validating manifest of crates.io crate include_optional 1.0.1 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate include_optional 1.0.1
[INFO] finished tweaking crates.io crate include_optional 1.0.1
[INFO] tweaked toml for crates.io crate include_optional 1.0.1 written to /workspace/builds/worker-48/source/Cargo.toml
[INFO] crate crates.io crate include_optional 1.0.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded trybuild v1.0.43
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 50d8433d4b324c735d9d5fcade17d44ba0eec37d3296fac051371de9cf9ee8a8
[INFO] running `Command { std: "docker" "start" "-a" "50d8433d4b324c735d9d5fcade17d44ba0eec37d3296fac051371de9cf9ee8a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "50d8433d4b324c735d9d5fcade17d44ba0eec37d3296fac051371de9cf9ee8a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50d8433d4b324c735d9d5fcade17d44ba0eec37d3296fac051371de9cf9ee8a8", kill_on_drop: false }`
[INFO] [stdout] 50d8433d4b324c735d9d5fcade17d44ba0eec37d3296fac051371de9cf9ee8a8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-48/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2f97969a1a9d693422dccff53597ae2090cc4266294b4d7c42c346e6cfececa5
[INFO] running `Command { std: "docker" "start" "-a" "2f97969a1a9d693422dccff53597ae2090cc4266294b4d7c42c346e6cfececa5", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling include_optional v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_span, path_try_exists)]
[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:4:29
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_span, path_try_exists)]
[INFO] [stdout]   |                             ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `include_optional` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "2f97969a1a9d693422dccff53597ae2090cc4266294b4d7c42c346e6cfececa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f97969a1a9d693422dccff53597ae2090cc4266294b4d7c42c346e6cfececa5", kill_on_drop: false }`
[INFO] [stdout] 2f97969a1a9d693422dccff53597ae2090cc4266294b4d7c42c346e6cfececa5