[INFO] fetching crate growable 0.7.0...
[INFO] testing growable-0.7.0 against 1.75.0 for beta-1.76-1
[INFO] extracting crate growable 0.7.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate growable 0.7.0 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 growable 0.7.0
[INFO] finished tweaking crates.io crate growable 0.7.0
[INFO] tweaked toml for crates.io crate growable 0.7.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] abca39e54a73cc4e4dcefd2ba213260bd9a362b43a3a5e690166c6d77d19575f
[INFO] running `Command { std: "docker" "start" "-a" "abca39e54a73cc4e4dcefd2ba213260bd9a362b43a3a5e690166c6d77d19575f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "abca39e54a73cc4e4dcefd2ba213260bd9a362b43a3a5e690166c6d77d19575f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "abca39e54a73cc4e4dcefd2ba213260bd9a362b43a3a5e690166c6d77d19575f", kill_on_drop: false }`
[INFO] [stdout] abca39e54a73cc4e4dcefd2ba213260bd9a362b43a3a5e690166c6d77d19575f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] b7642f115fe6b9d039f50fc0b411ff354d0545f9088ac800802326ea5b03a289
[INFO] running `Command { std: "docker" "start" "-a" "b7642f115fe6b9d039f50fc0b411ff354d0545f9088ac800802326ea5b03a289", kill_on_drop: false }`
[INFO] [stderr]    Compiling growable v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(allocator_api, coerce_unsized, slice_ptr_get, unsize)]
[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:15:27
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(allocator_api, coerce_unsized, slice_ptr_get, unsize)]
[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:15:43
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(allocator_api, coerce_unsized, slice_ptr_get, unsize)]
[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:15:58
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(allocator_api, coerce_unsized, slice_ptr_get, unsize)]
[INFO] [stdout]    |                                                          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 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 `growable` (lib) due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "b7642f115fe6b9d039f50fc0b411ff354d0545f9088ac800802326ea5b03a289", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7642f115fe6b9d039f50fc0b411ff354d0545f9088ac800802326ea5b03a289", kill_on_drop: false }`
[INFO] [stdout] b7642f115fe6b9d039f50fc0b411ff354d0545f9088ac800802326ea5b03a289
