[INFO] fetching crate why3 0.6.0...
[INFO] testing why3-0.6.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate why3 0.6.0 into /workspace/builds/worker-5-tc1/source
[INFO] started tweaking crates.io crate why3 0.6.0
[INFO] finished tweaking crates.io crate why3 0.6.0
[INFO] tweaked toml for crates.io crate why3 0.6.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate why3 0.6.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate why3 0.6.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_xorshift v0.4.0
[INFO] [stderr]   Downloaded typed-arena v2.0.2
[INFO] [stderr]   Downloaded pretty v0.12.4
[INFO] [stderr]   Downloaded string-interner v0.18.0
[INFO] [stderr]   Downloaded proptest v1.7.0
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a631fce6a2970c8ed51cece49eb818834be769b9d8728357b73fc4a09445e5f7
[INFO] running `Command { std: "docker" "start" "-a" "a631fce6a2970c8ed51cece49eb818834be769b9d8728357b73fc4a09445e5f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a631fce6a2970c8ed51cece49eb818834be769b9d8728357b73fc4a09445e5f7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a631fce6a2970c8ed51cece49eb818834be769b9d8728357b73fc4a09445e5f7", kill_on_drop: false }`
[INFO] [stdout] a631fce6a2970c8ed51cece49eb818834be769b9d8728357b73fc4a09445e5f7
[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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 646dd9fd0576a7163b907f4243d543a22381dfe7916cce8de10cd7f9c00ddfae
[INFO] running `Command { std: "docker" "start" "-a" "646dd9fd0576a7163b907f4243d543a22381dfe7916cce8de10cd7f9c00ddfae", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling typed-arena v2.0.2
[INFO] [stderr]    Compiling hashbrown v0.15.4
[INFO] [stderr]    Compiling arrayvec v0.5.2
[INFO] [stderr]    Compiling itertools v0.14.0
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling num-iter v0.1.45
[INFO] [stderr]    Compiling pretty v0.12.4
[INFO] [stderr]    Compiling indexmap v2.10.0
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling num v0.4.3
[INFO] [stderr]    Compiling string-interner v0.18.0
[INFO] [stderr]    Compiling serde_json v1.0.140
[INFO] [stderr]    Compiling why3 v0.6.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_as_array)]
[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 `why3` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "646dd9fd0576a7163b907f4243d543a22381dfe7916cce8de10cd7f9c00ddfae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "646dd9fd0576a7163b907f4243d543a22381dfe7916cce8de10cd7f9c00ddfae", kill_on_drop: false }`
[INFO] [stdout] 646dd9fd0576a7163b907f4243d543a22381dfe7916cce8de10cd7f9c00ddfae