[INFO] fetching crate crv20 0.1.0...
[INFO] testing crv20-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate crv20 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate crv20 0.1.0
[INFO] finished tweaking crates.io crate crv20 0.1.0
[INFO] tweaked toml for crates.io crate crv20 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate crv20 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 82 packages to latest compatible versions
[INFO] [stderr]       Adding casper-contract v1.4.4 (available: v5.1.1)
[INFO] [stderr]       Adding casper-types v1.5.0 (available: v6.0.1)
[INFO] [stderr]       Adding ed25519 v1.2.0 (available: v1.5.3)
[INFO] [stderr]       Adding signature v1.2.2 (available: v1.6.4)
[INFO] [stderr]       Adding subtle v2.4.1 (available: v2.6.1)
[INFO] [stderr]       Adding zeroize v1.3.0 (available: v1.8.2)
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded casperlabs-contract-utils v0.2.2
[INFO] [stderr]   Downloaded casper_types_derive v0.1.0
[INFO] [stderr]   Downloaded curve-casper-erc20 v0.1.0
[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] 5e774fd97d74b49d21253e59fd9565d178568b72db655bd8b8dbb44886915a35
[INFO] running `Command { std: "docker" "start" "-a" "5e774fd97d74b49d21253e59fd9565d178568b72db655bd8b8dbb44886915a35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5e774fd97d74b49d21253e59fd9565d178568b72db655bd8b8dbb44886915a35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5e774fd97d74b49d21253e59fd9565d178568b72db655bd8b8dbb44886915a35", kill_on_drop: false }`
[INFO] [stdout] 5e774fd97d74b49d21253e59fd9565d178568b72db655bd8b8dbb44886915a35
[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] 47badc675654123ed4aa51157c6db39c5de3f14bee2956ffa1e1320a183944c0
[INFO] running `Command { std: "docker" "start" "-a" "47badc675654123ed4aa51157c6db39c5de3f14bee2956ffa1e1320a183944c0", kill_on_drop: false }`
[INFO] [stderr]    Compiling casper_types_derive v0.1.0
[INFO] [stderr]    Compiling casper-contract v1.4.4
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/casper-contract-1.4.4/src/lib.rs:51:5
[INFO] [stdout]    |
[INFO] [stdout] 51 |     feature(alloc_error_handler, core_intrinsics, lang_items)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `casper-contract` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "47badc675654123ed4aa51157c6db39c5de3f14bee2956ffa1e1320a183944c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "47badc675654123ed4aa51157c6db39c5de3f14bee2956ffa1e1320a183944c0", kill_on_drop: false }`
[INFO] [stdout] 47badc675654123ed4aa51157c6db39c5de3f14bee2956ffa1e1320a183944c0