[INFO] fetching crate slog-dtrace 0.2.0...
[INFO] testing slog-dtrace-0.2.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate slog-dtrace 0.2.0 into /workspace/builds/worker-27/source
[INFO] validating manifest of crates.io crate slog-dtrace 0.2.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slog-dtrace 0.2.0
[INFO] finished tweaking crates.io crate slog-dtrace 0.2.0
[INFO] tweaked toml for crates.io crate slog-dtrace 0.2.0 written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] crate crates.io crate slog-dtrace 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded thread-id v4.0.0
[INFO] [stderr]   Downloaded dtrace-parser v0.1.12
[INFO] [stderr]   Downloaded libc v0.2.104
[INFO] [stderr]   Downloaded dof v0.1.5
[INFO] [stderr]   Downloaded subprocess v0.2.8
[INFO] [stderr]   Downloaded usdt-impl v0.2.0
[INFO] [stderr]   Downloaded usdt v0.2.0
[INFO] [stderr]   Downloaded serde_tokenstream v0.1.2
[INFO] [stderr]   Downloaded usdt-macro v0.2.0
[INFO] [stderr]   Downloaded usdt-attr-macro v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f34bc6bc60d8cc67a177728caa643e592ab5cac350d887f2c33d6e344227621
[INFO] running `Command { std: "docker" "start" "-a" "8f34bc6bc60d8cc67a177728caa643e592ab5cac350d887f2c33d6e344227621", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f34bc6bc60d8cc67a177728caa643e592ab5cac350d887f2c33d6e344227621", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f34bc6bc60d8cc67a177728caa643e592ab5cac350d887f2c33d6e344227621", kill_on_drop: false }`
[INFO] [stdout] 8f34bc6bc60d8cc67a177728caa643e592ab5cac350d887f2c33d6e344227621
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-27/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1848a09a9d427b6f1a3029dd32fc86b312167d512ce2f5c205237a54b01b1fbc
[INFO] running `Command { std: "docker" "start" "-a" "1848a09a9d427b6f1a3029dd32fc86b312167d512ce2f5c205237a54b01b1fbc", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling ucd-trie v0.1.3
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling libc v0.2.104
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling pest v2.1.3
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling pest_meta v2.1.3
[INFO] [stderr]    Compiling thread-id v4.0.0
[INFO] [stderr]    Compiling time v0.1.43
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]    Compiling pest_generator v2.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling zerocopy-derive v0.2.0
[INFO] [stderr]    Compiling pest_derive v2.1.0
[INFO] [stderr]    Compiling zerocopy v0.3.0
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling dof v0.1.5
[INFO] [stderr]    Compiling dtrace-parser v0.1.12
[INFO] [stderr]    Compiling serde_tokenstream v0.1.2
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling usdt-impl v0.2.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/usdt-impl-0.2.0/src/lib.rs:5:38
[INFO] [stdout]   |
[INFO] [stdout] 5 | #![cfg_attr(feature = "asm", feature(asm))]
[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 `usdt-impl` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "1848a09a9d427b6f1a3029dd32fc86b312167d512ce2f5c205237a54b01b1fbc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1848a09a9d427b6f1a3029dd32fc86b312167d512ce2f5c205237a54b01b1fbc", kill_on_drop: false }`
[INFO] [stdout] 1848a09a9d427b6f1a3029dd32fc86b312167d512ce2f5c205237a54b01b1fbc