[INFO] fetching crate frepl 0.1.1...
[INFO] documenting frepl-0.1.1 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate frepl 0.1.1 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate frepl 0.1.1 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate frepl 0.1.1
[INFO] finished tweaking crates.io crate frepl 0.1.1
[INFO] tweaked toml for crates.io crate frepl 0.1.1 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate frepl 0.1.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0609ab6ff514fe5be4f9207a60cf02733a7da2d86cea9502cc3e0e834d90ae13
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "0609ab6ff514fe5be4f9207a60cf02733a7da2d86cea9502cc3e0e834d90ae13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0609ab6ff514fe5be4f9207a60cf02733a7da2d86cea9502cc3e0e834d90ae13", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0609ab6ff514fe5be4f9207a60cf02733a7da2d86cea9502cc3e0e834d90ae13", kill_on_drop: false }`
[INFO] [stdout] 0609ab6ff514fe5be4f9207a60cf02733a7da2d86cea9502cc3e0e834d90ae13
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d5b80acef6c87c53cc75408b50db673258f7892103d60d4a6b70e4b4cfb73efd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "d5b80acef6c87c53cc75408b50db673258f7892103d60d4a6b70e4b4cfb73efd", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling cc v1.0.58
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking smallvec v1.4.1
[INFO] [stderr]    Compiling subtle v2.2.3
[INFO] [stderr]    Compiling cranelift-entity v0.59.0
[INFO] [stderr]    Compiling cranelift-codegen-shared v0.59.0
[INFO] [stderr]    Compiling constant_time_eq v0.1.5
[INFO] [stderr]    Compiling arrayvec v0.5.1
[INFO] [stderr]    Compiling nix v0.15.0
[INFO] [stderr]     Checking wasmparser v0.51.4
[INFO] [stderr]     Checking leb128 v0.2.4
[INFO] [stderr]    Compiling inventory v0.1.7
[INFO] [stderr]     Checking safe-transmute v0.11.0
[INFO] [stderr]     Checking id-arena v2.2.1
[INFO] [stderr]     Checking wasmparser v0.55.0
[INFO] [stderr]     Checking parity-wasm v0.41.0
[INFO] [stderr]     Checking boolinator v2.4.0
[INFO] [stderr]     Checking utf8parse v0.1.1
[INFO] [stderr]     Checking cmd_lib v0.7.8
[INFO] [stderr]     Checking utf8parse v0.2.0
[INFO] [stderr]     Checking rustop v1.1.0
[INFO] [stderr]    Compiling hashbrown v0.8.2
[INFO] [stderr]    Compiling indexmap v1.5.1
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking cranelift-bforest v0.59.0
[INFO] [stderr]     Checking wast v8.0.0
[INFO] [stderr]    Compiling cranelift-codegen-meta v0.59.0
[INFO] [stderr]     Checking vte v0.3.3
[INFO] [stderr]     Checking fuzzy-matcher v0.3.5
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]     Checking crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling blake3 v0.3.6
[INFO] [stderr]    Compiling raw-cpuid v7.0.3
[INFO] [stderr]     Checking pwasm-utils v0.12.0
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking errno v0.2.6
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking page_size v0.4.2
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking memmap v0.7.0
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking dirs-sys-next v0.1.0
[INFO] [stderr]     Checking nix v0.17.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]     Checking clap v2.33.2
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]     Checking dirs-next v1.0.1
[INFO] [stderr]     Checking rayon-core v1.7.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]    Compiling wasmer-runtime-core-fl v0.17.0
[INFO] [stderr]     Checking rayon v1.3.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking timer v0.2.0
[INFO] [stderr]     Checking uuid v0.8.1
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]     Checking tuikit v0.2.9
[INFO] [stderr]    Compiling cranelift-codegen v0.59.0
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]    Compiling thiserror-impl v1.0.20
[INFO] [stderr]    Compiling ctor v0.1.15
[INFO] [stderr]    Compiling ghost v0.1.2
[INFO] [stderr]    Compiling inventory-impl v0.1.7
[INFO] [stderr]    Compiling walrus-macro v0.17.0
[INFO] [stderr]    Compiling typetag-impl v0.1.5
[INFO] [stderr]    Compiling rustyline-derive v0.3.1
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]     Checking thiserror v1.0.20
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]     Checking walrus v0.17.0
[INFO] [stderr]    Compiling derive_builder_core v0.9.0
[INFO] [stderr]    Compiling derive_builder v0.9.0
[INFO] [stderr]     Checking skim v0.7.0
[INFO] [stderr]     Checking serde v1.0.115
[INFO] [stderr]     Checking rustyline v6.2.0
[INFO] [stderr]     Checking bincode v1.3.1
[INFO] [stderr]     Checking serde_bytes v0.11.5
[INFO] [stderr]     Checking serde-bench v0.0.7
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking erased-serde v0.3.12
[INFO] [stderr]     Checking multimap v0.8.1
[INFO] [stderr]     Checking generational-arena v0.2.8
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking gimli v0.20.0
[INFO] [stderr]     Checking typetag v0.1.5
[INFO] [stderr]     Checking wasmer-interface-types-fl v0.17.0
[INFO] [stderr]     Checking fce-wit-interfaces v0.1.0
[INFO] [stderr]     Checking fce-wit-parser v0.1.2
[INFO] [stderr]     Checking wasmer-wasi-fl v0.17.0
[INFO] [stderr]     Checking wasmer-clif-fork-frontend v0.59.0
[INFO] [stderr]     Checking cranelift-native v0.59.0
[INFO] [stderr]     Checking wasmer-clif-fork-wasm v0.59.0
[INFO] [stderr]     Checking wasmer-clif-backend-fl v0.17.0
[INFO] [stderr]     Checking wasmer-runtime-fl v0.17.0
[INFO] [stderr]     Checking fce v0.1.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/fce-0.1.1/src/lib.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![feature(get_mut_unchecked)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/fce-0.1.1/src/lib.rs:18:1
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(new_uninit)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/fce-0.1.1/src/lib.rs:19:1
[INFO] [stdout]    |
[INFO] [stdout] 19 | #![feature(stmt_expr_attributes)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 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 `fce`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "d5b80acef6c87c53cc75408b50db673258f7892103d60d4a6b70e4b4cfb73efd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5b80acef6c87c53cc75408b50db673258f7892103d60d4a6b70e4b4cfb73efd", kill_on_drop: false }`
[INFO] [stdout] d5b80acef6c87c53cc75408b50db673258f7892103d60d4a6b70e4b4cfb73efd