[INFO] fetching crate merkle-tree-accumulator 0.2.0...
[INFO] checking merkle-tree-accumulator-0.2.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate merkle-tree-accumulator 0.2.0 into /workspace/builds/worker-37/source
[INFO] validating manifest of crates.io crate merkle-tree-accumulator 0.2.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-37/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rlp v0.5.1
[INFO] [stderr]   Downloaded borsh-derive v0.8.2
[INFO] [stderr]   Downloaded near-rpc-error-core v0.1.0
[INFO] [stderr]   Downloaded borsh-derive-internal v0.8.2
[INFO] [stderr]   Downloaded near-vm-errors v4.0.0-pre.1
[INFO] [stderr]   Downloaded near-vm-logic v4.0.0-pre.1
[INFO] [stderr]   Downloaded near-sdk-core v3.1.0
[INFO] [stderr]   Downloaded near-rpc-error-macro v0.1.0
[INFO] [stderr]   Downloaded near-sdk v3.1.0
[INFO] [stderr]   Downloaded near-sdk-macros v3.1.0
[INFO] [stderr]   Downloaded near-primitives-core v0.4.0
[INFO] [stderr]   Downloaded near-runtime-utils v4.0.0-pre.1
[INFO] [stderr]   Downloaded borsh-schema-derive-internal v0.8.2
[INFO] [stderr]   Downloaded borsh v0.8.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1ef09cfe05c508cbbdc735f6d8363efb7aac2cf8820604aa59629b582d8835b0
[INFO] running `Command { std: "docker" "start" "-a" "1ef09cfe05c508cbbdc735f6d8363efb7aac2cf8820604aa59629b582d8835b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ef09cfe05c508cbbdc735f6d8363efb7aac2cf8820604aa59629b582d8835b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ef09cfe05c508cbbdc735f6d8363efb7aac2cf8820604aa59629b582d8835b0", kill_on_drop: false }`
[INFO] [stdout] 1ef09cfe05c508cbbdc735f6d8363efb7aac2cf8820604aa59629b582d8835b0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fccc9b6c07e9ddb22e7777688d93613c67cb9754c539fad43b40cdebbf70d008
[INFO] running `Command { std: "docker" "start" "-a" "fccc9b6c07e9ddb22e7777688d93613c67cb9754c539fad43b40cdebbf70d008", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.57
[INFO] [stderr]    Compiling serde_derive v1.0.118
[INFO] [stderr]    Compiling serde v1.0.118
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]    Compiling hashbrown v0.11.2
[INFO] [stderr]     Checking block-padding v0.2.1
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]     Checking ahash v0.4.7
[INFO] [stderr]     Checking opaque-debug v0.3.0
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]     Checking cpufeatures v0.2.1
[INFO] [stderr]     Checking hex v0.4.3
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking keccak v0.1.0
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking bs58 v0.4.0
[INFO] [stderr]    Compiling tiny-keccak v2.0.2
[INFO] [stderr]     Checking memory_units v0.4.0
[INFO] [stderr]     Checking rustc-hex v2.1.0
[INFO] [stderr]     Checking bytes v1.1.0
[INFO] [stderr]     Checking safe-transmute v0.11.2
[INFO] [stderr]    Compiling generic-array v0.14.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.3.3
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking rlp v0.5.1
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking sha2 v0.9.8
[INFO] [stderr]     Checking sha3 v0.9.1
[INFO] [stderr]     Checking near-runtime-utils v4.0.0-pre.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 derive_more v0.99.16
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling near-sdk-macros v3.1.0
[INFO] [stderr]     Checking thiserror v1.0.30
[INFO] [stderr]    Compiling toml v0.5.8
[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]     Checking borsh v0.8.2
[INFO] [stderr]     Checking near-vm-errors v4.0.0-pre.1
[INFO] [stderr]     Checking near-primitives-core v0.4.0
[INFO] [stderr]     Checking near-vm-logic v4.0.0-pre.1
[INFO] [stderr]     Checking near-sdk v3.1.0
[INFO] [stderr]     Checking merkle-tree-accumulator v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(int_roundings)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:1
[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] [stderr] warning: build failed, waiting for other jobs to finish...
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "fccc9b6c07e9ddb22e7777688d93613c67cb9754c539fad43b40cdebbf70d008", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fccc9b6c07e9ddb22e7777688d93613c67cb9754c539fad43b40cdebbf70d008", kill_on_drop: false }`
[INFO] [stdout] fccc9b6c07e9ddb22e7777688d93613c67cb9754c539fad43b40cdebbf70d008
