[INFO] fetching crate overloadf 0.1.8...
[INFO] testing overloadf-0.1.8 against 1.95.0 for beta-1.96-2
[INFO] extracting crate overloadf 0.1.8 into /workspace/builds/worker-6-tc1/source
[INFO] removed /workspace/builds/worker-6-tc1/source/rust-toolchain
[INFO] started tweaking crates.io crate overloadf 0.1.8
[INFO] finished tweaking crates.io crate overloadf 0.1.8
[INFO] tweaked toml for crates.io crate overloadf 0.1.8 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate overloadf 0.1.8 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 17 packages to latest compatible versions
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded futures-sink v0.3.32
[INFO] [stderr]   Downloaded futures-io v0.3.32
[INFO] [stderr]   Downloaded pin-project-lite v0.2.17
[INFO] [stderr]   Downloaded futures-macro v0.3.32
[INFO] [stderr]   Downloaded futures-executor v0.3.32
[INFO] [stderr]   Downloaded futures-channel v0.3.32
[INFO] [stderr]   Downloaded futures v0.3.32
[INFO] [stderr]   Downloaded slab v0.4.12
[INFO] [stderr]   Downloaded futures-core v0.3.32
[INFO] [stderr]   Downloaded futures-task v0.3.32
[INFO] [stderr]   Downloaded overloadf_derive v0.1.8
[INFO] [stderr]   Downloaded futures-util v0.3.32
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] eb7432b1b9549905d638fd12be6f7924176b28b74ae9b6778be127ca105796c9
[INFO] running `Command { std: "docker" "start" "-a" "eb7432b1b9549905d638fd12be6f7924176b28b74ae9b6778be127ca105796c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb7432b1b9549905d638fd12be6f7924176b28b74ae9b6778be127ca105796c9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb7432b1b9549905d638fd12be6f7924176b28b74ae9b6778be127ca105796c9", kill_on_drop: false }`
[INFO] [stdout] eb7432b1b9549905d638fd12be6f7924176b28b74ae9b6778be127ca105796c9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] addd354fd000fd9aa1eda10ba51775af5b44a33e9d7b443ce27d25a2300efdc5
[INFO] running `Command { std: "docker" "start" "-a" "addd354fd000fd9aa1eda10ba51775af5b44a33e9d7b443ce27d25a2300efdc5", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-ident v1.0.24
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling overloadf_derive v0.1.8
[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/overloadf_derive-0.1.8/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_diagnostic, proc_macro_span, lazy_cell)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `overloadf_derive` (lib) due to 1 previous error
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "addd354fd000fd9aa1eda10ba51775af5b44a33e9d7b443ce27d25a2300efdc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "addd354fd000fd9aa1eda10ba51775af5b44a33e9d7b443ce27d25a2300efdc5", kill_on_drop: false }`
[INFO] [stdout] addd354fd000fd9aa1eda10ba51775af5b44a33e9d7b443ce27d25a2300efdc5
