[INFO] fetching crate qwant 1.0.3...
[INFO] testing qwant-1.0.3 against 1.91.0 for beta-1.92-2
[INFO] extracting crate qwant 1.0.3 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate qwant 1.0.3
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate qwant 1.0.3
[INFO] tweaked toml for crates.io crate qwant 1.0.3 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate qwant 1.0.3 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate qwant 1.0.3 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" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded atools v0.1.9
[INFO] [stderr]   Downloaded array_chunks v1.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 534e1998f726788c0650c1e3d86e49c2599f87c5053d993cccf8d4fe93382696
[INFO] running `Command { std: "docker" "start" "-a" "534e1998f726788c0650c1e3d86e49c2599f87c5053d993cccf8d4fe93382696", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "534e1998f726788c0650c1e3d86e49c2599f87c5053d993cccf8d4fe93382696", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "534e1998f726788c0650c1e3d86e49c2599f87c5053d993cccf8d4fe93382696", kill_on_drop: false }`
[INFO] [stdout] 534e1998f726788c0650c1e3d86e49c2599f87c5053d993cccf8d4fe93382696
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26ddde02c8268965ed5b3a3fac1ca8048ab16bb8c466bbeb63c4f30db6bb98d7
[INFO] running `Command { std: "docker" "start" "-a" "26ddde02c8268965ed5b3a3fac1ca8048ab16bb8c466bbeb63c4f30db6bb98d7", kill_on_drop: false }`
[INFO] [stderr]    Compiling atools v0.1.9
[INFO] [stderr]    Compiling array_chunks v1.0.0
[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/atools-0.1.9/src/lib.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout]  4 | / #![feature(
[INFO] [stdout]  5 | |     const_destruct,
[INFO] [stdout]  6 | |     adt_const_params,
[INFO] [stdout]  7 | |     generic_const_exprs,
[INFO] [stdout] ...  |
[INFO] [stdout] 13 | |     iter_map_windows
[INFO] [stdout] 14 | | )]
[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 `atools` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "26ddde02c8268965ed5b3a3fac1ca8048ab16bb8c466bbeb63c4f30db6bb98d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26ddde02c8268965ed5b3a3fac1ca8048ab16bb8c466bbeb63c4f30db6bb98d7", kill_on_drop: false }`
[INFO] [stdout] 26ddde02c8268965ed5b3a3fac1ca8048ab16bb8c466bbeb63c4f30db6bb98d7