[INFO] fetching crate uniswap-erc20 0.3.0...
[INFO] testing uniswap-erc20-0.3.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate uniswap-erc20 0.3.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate uniswap-erc20 0.3.0
[INFO] finished tweaking crates.io crate uniswap-erc20 0.3.0
[INFO] tweaked toml for crates.io crate uniswap-erc20 0.3.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate uniswap-erc20 0.3.0 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]     Blocking waiting for file lock on package cache
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded casper_types_derive v0.1.0
[INFO] [stderr]   Downloaded casperlabs-contract-utils v0.2.2
[INFO] [stderr]   Downloaded k256 v0.7.3
[INFO] [stderr]   Downloaded ff v0.8.0
[INFO] [stderr]   Downloaded ecdsa v0.10.2
[INFO] [stderr]   Downloaded group v0.8.0
[INFO] [stderr]   Downloaded wee_alloc v0.4.5
[INFO] [stderr]   Downloaded memory_units v0.4.0
[INFO] [stderr]   Downloaded signature v1.2.2
[INFO] [stderr]   Downloaded casper-erc20-crate v0.1.3
[INFO] [stderr]   Downloaded casper-contract v1.4.4
[INFO] [stderr]   Downloaded blake2 v0.9.2
[INFO] [stderr]   Downloaded base16 v0.2.1
[INFO] [stderr]   Downloaded elliptic-curve v0.8.5
[INFO] [stderr]   Downloaded bitvec v0.18.5
[INFO] [stderr]   Downloaded casper-types v1.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 1e0b024efa62c169b214c26046ed166eda377c749e3e8937d9ce96b6adbea9bb
[INFO] running `Command { std: "docker" "start" "-a" "1e0b024efa62c169b214c26046ed166eda377c749e3e8937d9ce96b6adbea9bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e0b024efa62c169b214c26046ed166eda377c749e3e8937d9ce96b6adbea9bb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e0b024efa62c169b214c26046ed166eda377c749e3e8937d9ce96b6adbea9bb", kill_on_drop: false }`
[INFO] [stdout] 1e0b024efa62c169b214c26046ed166eda377c749e3e8937d9ce96b6adbea9bb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 31b4b9bca439af385d79bc324b6cbff20987ae7de53e8fc4292246e015838052
[INFO] running `Command { std: "docker" "start" "-a" "31b4b9bca439af385d79bc324b6cbff20987ae7de53e8fc4292246e015838052", kill_on_drop: false }`
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling subtle v2.4.1
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling funty v1.1.0
[INFO] [stderr]    Compiling wyz v0.2.0
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling crunchy v0.2.4
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling hex v0.4.3
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling memchr v2.7.6
[INFO] [stderr]    Compiling rand_core v0.6.4
[INFO] [stderr]    Compiling wee_alloc v0.4.5
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]    Compiling hex_fmt v0.3.0
[INFO] [stderr]    Compiling memory_units v0.4.0
[INFO] [stderr]    Compiling uint v0.9.5
[INFO] [stderr]    Compiling base64 v0.13.1
[INFO] [stderr]    Compiling base16 v0.2.1
[INFO] [stderr]    Compiling casper_types_derive v0.1.0
[INFO] [stderr]    Compiling bitvec v0.18.5
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling num-complex v0.4.6
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling digest v0.9.0
[INFO] [stderr]    Compiling crypto-mac v0.10.1
[INFO] [stderr]    Compiling block-buffer v0.9.0
[INFO] [stderr]    Compiling crypto-mac v0.8.0
[INFO] [stderr]    Compiling signature v1.2.2
[INFO] [stderr]    Compiling sha2 v0.9.9
[INFO] [stderr]    Compiling blake2 v0.9.2
[INFO] [stderr]    Compiling hmac v0.10.1
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling num-iter v0.1.45
[INFO] [stderr]    Compiling ed25519 v1.2.0
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling num-rational v0.4.2
[INFO] [stderr]    Compiling num v0.4.3
[INFO] [stderr]    Compiling ff v0.8.0
[INFO] [stderr]    Compiling group v0.8.0
[INFO] [stderr]    Compiling serde_bytes v0.11.19
[INFO] [stderr]    Compiling zeroize_derive v1.4.2
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling zeroize v1.3.0
[INFO] [stderr]    Compiling elliptic-curve v0.8.5
[INFO] [stderr]    Compiling curve25519-dalek v3.2.1
[INFO] [stderr]    Compiling ecdsa v0.10.2
[INFO] [stderr]    Compiling ed25519-dalek v1.0.1
[INFO] [stderr]    Compiling k256 v0.7.3
[INFO] [stderr]    Compiling casper-types v1.5.0
[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" "31b4b9bca439af385d79bc324b6cbff20987ae7de53e8fc4292246e015838052", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31b4b9bca439af385d79bc324b6cbff20987ae7de53e8fc4292246e015838052", kill_on_drop: false }`
[INFO] [stdout] 31b4b9bca439af385d79bc324b6cbff20987ae7de53e8fc4292246e015838052
