[INFO] fetching crate src-graph 0.1.4...
[INFO] testing src-graph-0.1.4 against 1.91.0 for beta-1.92-2
[INFO] extracting crate src-graph 0.1.4 into /workspace/builds/worker-3-tc1/source
[INFO] removed /workspace/builds/worker-3-tc1/source/rust-toolchain
[INFO] started tweaking crates.io crate src-graph 0.1.4
[INFO] finished tweaking crates.io crate src-graph 0.1.4
[INFO] tweaked toml for crates.io crate src-graph 0.1.4 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate src-graph 0.1.4 on toolchain 1.91.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate src-graph 0.1.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.91.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-ap-graphviz v662.0.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4f0f49156fe0f0af672c7c7844fee03571d79c941cac6a6315ab241d3ee4fc10
[INFO] running `Command { std: "docker" "start" "-a" "4f0f49156fe0f0af672c7c7844fee03571d79c941cac6a6315ab241d3ee4fc10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4f0f49156fe0f0af672c7c7844fee03571d79c941cac6a6315ab241d3ee4fc10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4f0f49156fe0f0af672c7c7844fee03571d79c941cac6a6315ab241d3ee4fc10", kill_on_drop: false }`
[INFO] [stdout] 4f0f49156fe0f0af672c7c7844fee03571d79c941cac6a6315ab241d3ee4fc10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+1.91.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f9b0f4c0c74691d4875115315afd2a26f9e72fb5d3462277060f9cad2f4d7ed5
[INFO] running `Command { std: "docker" "start" "-a" "f9b0f4c0c74691d4875115315afd2a26f9e72fb5d3462277060f9cad2f4d7ed5", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-ap-graphviz v662.0.0
[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/rustc-ap-graphviz-662.0.0/lib.rs:278:1
[INFO] [stdout]     |
[INFO] [stdout] 278 | #![feature(rustc_private, nll)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: the feature `nll` has been stable since `1.63.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustc-ap-graphviz` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "f9b0f4c0c74691d4875115315afd2a26f9e72fb5d3462277060f9cad2f4d7ed5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9b0f4c0c74691d4875115315afd2a26f9e72fb5d3462277060f9cad2f4d7ed5", kill_on_drop: false }`
[INFO] [stdout] f9b0f4c0c74691d4875115315afd2a26f9e72fb5d3462277060f9cad2f4d7ed5