[INFO] fetching crate vrsc-rpc 0.0.2...
[INFO] testing vrsc-rpc-0.0.2 against 1.60.0 for beta-1.61-1
[INFO] extracting crate vrsc-rpc 0.0.2 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate vrsc-rpc 0.0.2 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate vrsc-rpc 0.0.2
[INFO] finished tweaking crates.io crate vrsc-rpc 0.0.2
[INFO] tweaked toml for crates.io crate vrsc-rpc 0.0.2 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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" "+1.60.0" "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 jsonrpc v0.11.0
[INFO] [stderr]   Downloaded vrsc-rpc-json v0.0.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] af193fd8686893bbdf26df03aeef6c355844d78b6eac84a6716290584a3730d5
[INFO] running `Command { std: "docker" "start" "-a" "af193fd8686893bbdf26df03aeef6c355844d78b6eac84a6716290584a3730d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "af193fd8686893bbdf26df03aeef6c355844d78b6eac84a6716290584a3730d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af193fd8686893bbdf26df03aeef6c355844d78b6eac84a6716290584a3730d5", kill_on_drop: false }`
[INFO] [stdout] af193fd8686893bbdf26df03aeef6c355844d78b6eac84a6716290584a3730d5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9554c17db8202c303f0e2723d10e3bc6f72ad7d8fca8f74714b0ef69254da4b6
[INFO] running `Command { std: "docker" "start" "-a" "9554c17db8202c303f0e2723d10e3bc6f72ad7d8fca8f74714b0ef69254da4b6", kill_on_drop: false }`
[INFO] [stderr]    Compiling bech32 v0.7.3
[INFO] [stderr]    Compiling bitcoin_hashes v0.9.7
[INFO] [stderr]    Compiling bech32 v0.8.1
[INFO] [stderr]    Compiling typeable v0.1.2
[INFO] [stderr]    Compiling traitobject v0.1.0
[INFO] [stderr]    Compiling secp256k1-sys v0.4.2
[INFO] [stderr]    Compiling secp256k1-sys v0.3.0
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling base64 v0.9.3
[INFO] [stderr]    Compiling log v0.3.9
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling dirs-sys v0.3.7
[INFO] [stderr]    Compiling bitcoin_hashes v0.10.0
[INFO] [stderr]    Compiling os_info v3.2.0
[INFO] [stderr]    Compiling mime v0.2.6
[INFO] [stderr]    Compiling dirs v4.0.0
[INFO] [stderr]    Compiling hyper v0.10.16
[INFO] [stderr]    Compiling secp256k1 v0.19.0
[INFO] [stderr]    Compiling secp256k1 v0.20.3
[INFO] [stderr]    Compiling bitcoin v0.26.2
[INFO] [stderr]    Compiling jsonrpc v0.11.0
[INFO] [stderr]    Compiling bitcoin v0.27.1
[INFO] [stderr]    Compiling vrsc v0.0.1
[INFO] [stderr]    Compiling vrsc-rpc-json v0.0.1
[INFO] [stderr]    Compiling vrsc-rpc v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:3:12
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![feature(io_error_more)]
[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 `vrsc-rpc` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9554c17db8202c303f0e2723d10e3bc6f72ad7d8fca8f74714b0ef69254da4b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9554c17db8202c303f0e2723d10e3bc6f72ad7d8fca8f74714b0ef69254da4b6", kill_on_drop: false }`
[INFO] [stdout] 9554c17db8202c303f0e2723d10e3bc6f72ad7d8fca8f74714b0ef69254da4b6