[INFO] fetching crate meiosis 0.1.0...
[INFO] testing meiosis-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate meiosis 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] removed /workspace/builds/worker-4-tc1/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate meiosis 0.1.0
[INFO] finished tweaking crates.io crate meiosis 0.1.0
[INFO] tweaked toml for crates.io crate meiosis 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate meiosis 0.1.0 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 meiosis 0.1.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] fc6e338314df7eefc9ae1e3c08d9e4203013b26ce682247fc34d84c0da463a03
[INFO] running `Command { std: "docker" "start" "-a" "fc6e338314df7eefc9ae1e3c08d9e4203013b26ce682247fc34d84c0da463a03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fc6e338314df7eefc9ae1e3c08d9e4203013b26ce682247fc34d84c0da463a03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc6e338314df7eefc9ae1e3c08d9e4203013b26ce682247fc34d84c0da463a03", kill_on_drop: false }`
[INFO] [stdout] fc6e338314df7eefc9ae1e3c08d9e4203013b26ce682247fc34d84c0da463a03
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 7acdae2cd5d53fbe7cdb712169cb56325439bfd2fbfbfac410e573b73ed89a73
[INFO] running `Command { std: "docker" "start" "-a" "7acdae2cd5d53fbe7cdb712169cb56325439bfd2fbfbfac410e573b73ed89a73", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.135
[INFO] [stderr]    Compiling getrandom v0.2.8
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling meiosis v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(generic_const_exprs)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lint `box_pointers` has been removed: it does not detect other kinds of allocations, and existed only for historical reasons
[INFO] [stdout]  --> src/operators/mutation/combination.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![allow(box_pointers)]
[INFO] [stdout]   |          ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(renamed_and_removed_lints)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lint `box_pointers` has been removed: it does not detect other kinds of allocations, and existed only for historical reasons
[INFO] [stdout]  --> src/termination/combination.rs:1:10
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![allow(box_pointers)]
[INFO] [stdout]   |          ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/operators/recombination/single_point.rs:35:13
[INFO] [stdout]    |
[INFO] [stdout] 35 |         let [parent_one, parent_two] = parents;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^ expected `2`, found `<Self as Recombination<Vec<GENE>>>::PARENTS`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected constant `2`
[INFO] [stdout]               found constant `<Self as Recombination<Vec<GENE>>>::PARENTS`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/operators/recombination/single_point.rs:59:20
[INFO] [stdout]    |
[INFO] [stdout] 59 |             return [offspring1, offspring2];
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^ expected `<Self as Recombination<Vec<GENE>>>::OFFSPRING`, found `2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected constant `<Self as Recombination<Vec<GENE>>>::OFFSPRING`
[INFO] [stdout]               found constant `2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/operators/recombination/single_point.rs:84:9
[INFO] [stdout]    |
[INFO] [stdout] 84 |         [offspring1, offspring2]
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^ expected `<Self as Recombination<Vec<GENE>>>::OFFSPRING`, found `2`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected constant `<Self as Recombination<Vec<GENE>>>::OFFSPRING`
[INFO] [stdout]               found constant `2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/operators/recombination/single_point.rs:107:13
[INFO] [stdout]     |
[INFO] [stdout] 107 |         let [parent_one, parent_two] = parents;
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^ expected `2`, found `<Self as Recombination<[GENE; GENES]>>::PARENTS`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected constant `2`
[INFO] [stdout]                found constant `<Self as Recombination<[GENE; GENES]>>::PARENTS`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/operators/recombination/single_point.rs:128:9
[INFO] [stdout]     |
[INFO] [stdout] 128 |         [offspring1, offspring2]
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^ expected `<Self as Recombination<[GENE; GENES]>>::OFFSPRING`, found `2`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected constant `<Self as Recombination<[GENE; GENES]>>::OFFSPRING`
[INFO] [stdout]                found constant `2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `meiosis` (lib) due to 6 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "7acdae2cd5d53fbe7cdb712169cb56325439bfd2fbfbfac410e573b73ed89a73", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7acdae2cd5d53fbe7cdb712169cb56325439bfd2fbfbfac410e573b73ed89a73", kill_on_drop: false }`
[INFO] [stdout] 7acdae2cd5d53fbe7cdb712169cb56325439bfd2fbfbfac410e573b73ed89a73