[INFO] fetching crate dm_x 0.2.3...
[INFO] testing dm_x-0.2.3 against 1.75.0 for beta-1.76-1
[INFO] extracting crate dm_x 0.2.3 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate dm_x 0.2.3 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate dm_x 0.2.3
[INFO] finished tweaking crates.io crate dm_x 0.2.3
[INFO] tweaked toml for crates.io crate dm_x 0.2.3 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate dm_x 0.2.3 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7ab8d413edc0cfa96ebd1c95aaede54938d1d4ee5cad5c92ffacaebc0b47b9be
[INFO] running `Command { std: "docker" "start" "-a" "7ab8d413edc0cfa96ebd1c95aaede54938d1d4ee5cad5c92ffacaebc0b47b9be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7ab8d413edc0cfa96ebd1c95aaede54938d1d4ee5cad5c92ffacaebc0b47b9be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7ab8d413edc0cfa96ebd1c95aaede54938d1d4ee5cad5c92ffacaebc0b47b9be", kill_on_drop: false }`
[INFO] [stdout] 7ab8d413edc0cfa96ebd1c95aaede54938d1d4ee5cad5c92ffacaebc0b47b9be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8f26581a0ec615fb3806354a19ce0e62abd46dc84fcfdfc26a94c20e2c3509ab
[INFO] running `Command { std: "docker" "start" "-a" "8f26581a0ec615fb3806354a19ce0e62abd46dc84fcfdfc26a94c20e2c3509ab", kill_on_drop: false }`
[INFO] [stderr]    Compiling dm_x v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:97:1
[INFO] [stdout]    |
[INFO] [stdout] 97 | #![feature(doc_cfg)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dm_x` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "8f26581a0ec615fb3806354a19ce0e62abd46dc84fcfdfc26a94c20e2c3509ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f26581a0ec615fb3806354a19ce0e62abd46dc84fcfdfc26a94c20e2c3509ab", kill_on_drop: false }`
[INFO] [stdout] 8f26581a0ec615fb3806354a19ce0e62abd46dc84fcfdfc26a94c20e2c3509ab
