[INFO] fetching crate enso-flexer 0.2.0...
[INFO] testing enso-flexer-0.2.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate enso-flexer 0.2.0 into /workspace/builds/worker-27/source
[INFO] validating manifest of crates.io crate enso-flexer 0.2.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate enso-flexer 0.2.0
[INFO] finished tweaking crates.io crate enso-flexer 0.2.0
[INFO] tweaked toml for crates.io crate enso-flexer 0.2.0 written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "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" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bb9459c765af48d18cb00bef86cefe6a1bf9e2b406cce240b73eea3cbbb4a0b3
[INFO] running `Command { std: "docker" "start" "-a" "bb9459c765af48d18cb00bef86cefe6a1bf9e2b406cce240b73eea3cbbb4a0b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb9459c765af48d18cb00bef86cefe6a1bf9e2b406cce240b73eea3cbbb4a0b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb9459c765af48d18cb00bef86cefe6a1bf9e2b406cce240b73eea3cbbb4a0b3", kill_on_drop: false }`
[INFO] [stdout] bb9459c765af48d18cb00bef86cefe6a1bf9e2b406cce240b73eea3cbbb4a0b3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4f28239c1a88265e45105b02f7ac860fc46fbcbdd0931eedd08eb9d32253b0a6
[INFO] running `Command { std: "docker" "start" "-a" "4f28239c1a88265e45105b02f7ac860fc46fbcbdd0931eedd08eb9d32253b0a6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling wasm-bindgen-shared v0.2.58
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling bumpalo v3.9.1
[INFO] [stderr]    Compiling libc v0.2.119
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling anyhow v1.0.55
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling unicode-segmentation v1.9.0
[INFO] [stderr]    Compiling crc32fast v1.3.2
[INFO] [stderr]    Compiling wasm-bindgen v0.2.58
[INFO] [stderr]    Compiling serde_derive v1.0.136
[INFO] [stderr]    Compiling cfg-if v0.1.10
[INFO] [stderr]    Compiling rustversion v1.0.6
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling sourcefile v0.1.4
[INFO] [stderr]    Compiling rawpointer v0.2.1
[INFO] [stderr]    Compiling boolinator v2.4.0
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling paste v1.0.6
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling enclose v1.1.8
[INFO] [stderr]    Compiling weak-table v0.3.2
[INFO] [stderr]    Compiling smallvec v1.8.0
[INFO] [stderr]    Compiling nonempty v0.1.5
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.4.3
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling num-rational v0.4.0
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling matrixmultiply v0.3.2
[INFO] [stderr]    Compiling nom v4.2.3
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling itertools v0.10.3
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling object v0.27.1
[INFO] [stderr]    Compiling num-complex v0.3.1
[INFO] [stderr]    Compiling approx v0.4.0
[INFO] [stderr]    Compiling num-complex v0.4.0
[INFO] [stderr]    Compiling weedle v0.10.0
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling flate2 v1.0.22
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling colored v2.0.0
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]    Compiling simba v0.4.0
[INFO] [stderr]    Compiling object v0.24.0
[INFO] [stderr]    Compiling paste v0.1.18
[INFO] [stderr]    Compiling Inflector v0.11.4
[INFO] [stderr]    Compiling num v0.4.0
[INFO] [stderr]    Compiling backtrace v0.3.64
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.58
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.58
[INFO] [stderr]    Compiling wasm-bindgen-webidl v0.2.58
[INFO] [stderr]    Compiling enso-macro-utils v0.2.0
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]    Compiling ifmt-impl v0.3.3
[INFO] [stderr]    Compiling derivative v2.2.0
[INFO] [stderr]    Compiling shrinkwraprs v0.3.0
[INFO] [stderr]    Compiling derive_more v0.99.17
[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/enso-macro-utils-0.2.0/src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![feature(trait_alias)]
[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 `enso-macro-utils` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "4f28239c1a88265e45105b02f7ac860fc46fbcbdd0931eedd08eb9d32253b0a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f28239c1a88265e45105b02f7ac860fc46fbcbdd0931eedd08eb9d32253b0a6", kill_on_drop: false }`
[INFO] [stdout] 4f28239c1a88265e45105b02f7ac860fc46fbcbdd0931eedd08eb9d32253b0a6