[INFO] fetching crate casper-erc20-crate 0.1.3...
[INFO] checking casper-erc20-crate-0.1.3 against 1.95.0 for pr-155915
[INFO] extracting crate casper-erc20-crate 0.1.3 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate casper-erc20-crate 0.1.3
[INFO] finished tweaking crates.io crate casper-erc20-crate 0.1.3
[INFO] tweaked toml for crates.io crate casper-erc20-crate 0.1.3 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate casper-erc20-crate 0.1.3 on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "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" "+1.95.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 79 packages to latest compatible versions
[INFO] [stderr]       Adding base64 v0.13.1 (available: v0.22.1)
[INFO] [stderr]       Adding casper-contract v1.4.4 (available: v5.1.1)
[INFO] [stderr]       Adding casper-types v1.5.0 (available: v7.0.0)
[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" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 450bde4752a74faed1a9211a30bff319bd6881d909e40ce1035e9132ff502b91
[INFO] running `Command { std: "docker" "start" "-a" "450bde4752a74faed1a9211a30bff319bd6881d909e40ce1035e9132ff502b91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "450bde4752a74faed1a9211a30bff319bd6881d909e40ce1035e9132ff502b91", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "450bde4752a74faed1a9211a30bff319bd6881d909e40ce1035e9132ff502b91", kill_on_drop: false }`
[INFO] [stdout] 450bde4752a74faed1a9211a30bff319bd6881d909e40ce1035e9132ff502b91
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 18d86e23152ead4dce519ce89d2ab8078f98a94977a62d3d12dea531937093e6
[INFO] running `Command { std: "docker" "start" "-a" "18d86e23152ead4dce519ce89d2ab8078f98a94977a62d3d12dea531937093e6", kill_on_drop: false }`
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking subtle v2.4.1
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling crunchy v0.2.4
[INFO] [stderr]     Checking block-buffer v0.9.0
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]     Checking ppv-lite86 v0.2.21
[INFO] [stderr]    Compiling num-derive v0.3.3
[INFO] [stderr]     Checking base64 v0.13.1
[INFO] [stderr]     Checking once_cell v1.21.4
[INFO] [stderr]     Checking crypto-mac v0.10.1
[INFO] [stderr]     Checking crypto-mac v0.8.0
[INFO] [stderr]     Checking sha2 v0.9.9
[INFO] [stderr]     Checking blake2 v0.9.2
[INFO] [stderr]     Checking ff v0.8.0
[INFO] [stderr]     Checking signature v1.2.2
[INFO] [stderr]     Checking curve25519-dalek v3.2.1
[INFO] [stderr]     Checking hmac v0.10.1
[INFO] [stderr]     Checking ed25519 v1.2.0
[INFO] [stderr]     Checking group v0.8.0
[INFO] [stderr]     Checking elliptic-curve v0.8.5
[INFO] [stderr]     Checking uint v0.9.5
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking ecdsa v0.10.2
[INFO] [stderr]     Checking ed25519-dalek v1.0.1
[INFO] [stderr]     Checking k256 v0.7.3
[INFO] [stderr]     Checking serde_json v1.0.149
[INFO] [stderr]     Checking serde_bytes v0.11.19
[INFO] [stderr]     Checking casper-types v1.5.0
[INFO] [stderr]     Checking 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] running `Command { std: "docker" "inspect" "18d86e23152ead4dce519ce89d2ab8078f98a94977a62d3d12dea531937093e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18d86e23152ead4dce519ce89d2ab8078f98a94977a62d3d12dea531937093e6", kill_on_drop: false }`
[INFO] [stdout] 18d86e23152ead4dce519ce89d2ab8078f98a94977a62d3d12dea531937093e6