[INFO] fetching crate merkle-tree-accumulator 0.2.0...
[INFO] testing merkle-tree-accumulator-0.2.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate merkle-tree-accumulator 0.2.0 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate merkle-tree-accumulator 0.2.0 on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate merkle-tree-accumulator 0.2.0
[INFO] finished tweaking crates.io crate merkle-tree-accumulator 0.2.0
[INFO] tweaked toml for crates.io crate merkle-tree-accumulator 0.2.0 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a0b921a99ec09f9058a708166bd605165a4b76f39cf7a4ae010603bf618ecabe
[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" "a0b921a99ec09f9058a708166bd605165a4b76f39cf7a4ae010603bf618ecabe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a0b921a99ec09f9058a708166bd605165a4b76f39cf7a4ae010603bf618ecabe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a0b921a99ec09f9058a708166bd605165a4b76f39cf7a4ae010603bf618ecabe", kill_on_drop: false }`
[INFO] [stdout] a0b921a99ec09f9058a708166bd605165a4b76f39cf7a4ae010603bf618ecabe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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" "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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 28c8988f4fa946ee7725ffc1203174fb3ef4b0c3995a5740a2b9eb7f053821a4
[INFO] running `Command { std: "docker" "start" "-a" "28c8988f4fa946ee7725ffc1203174fb3ef4b0c3995a5740a2b9eb7f053821a4", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]    Compiling memory_units v0.4.0
[INFO] [stderr]    Compiling bytes v1.1.0
[INFO] [stderr]    Compiling safe-transmute v0.11.2
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling near-runtime-utils v4.0.0-pre.1
[INFO] [stderr]    Compiling sha2 v0.9.9
[INFO] [stderr]    Compiling sha3 v0.9.1
[INFO] [stderr]    Compiling rlp v0.5.1
[INFO] [stderr]    Compiling borsh-derive-internal v0.8.2
[INFO] [stderr]    Compiling borsh-schema-derive-internal v0.8.2
[INFO] [stderr]    Compiling near-sdk-core v3.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]    Compiling near-sdk-macros v3.1.0
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling toml v0.5.8
[INFO] [stderr]    Compiling serde_json v1.0.79
[INFO] [stderr]    Compiling near-rpc-error-core v0.1.0
[INFO] [stderr]    Compiling proc-macro-crate v0.1.5
[INFO] [stderr]    Compiling near-rpc-error-macro v0.1.0
[INFO] [stderr]    Compiling borsh-derive v0.8.2
[INFO] [stderr]    Compiling borsh v0.8.2
[INFO] [stderr]    Compiling near-primitives-core v0.4.0
[INFO] [stderr]    Compiling near-vm-errors v4.0.0-pre.1
[INFO] [stderr]    Compiling near-vm-logic v4.0.0-pre.1
[INFO] [stderr]    Compiling near-sdk v3.1.0
[INFO] [stderr]    Compiling merkle-tree-accumulator v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(int_roundings)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `merkle-tree-accumulator` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "28c8988f4fa946ee7725ffc1203174fb3ef4b0c3995a5740a2b9eb7f053821a4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "28c8988f4fa946ee7725ffc1203174fb3ef4b0c3995a5740a2b9eb7f053821a4", kill_on_drop: false }`
[INFO] [stdout] 28c8988f4fa946ee7725ffc1203174fb3ef4b0c3995a5740a2b9eb7f053821a4