[INFO] cloning repository https://github.com/CompPrakt21/first-follow-generator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CompPrakt21/first-follow-generator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCompPrakt21%2Ffirst-follow-generator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCompPrakt21%2Ffirst-follow-generator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d34b8fd388dd48c403405ad6b2b33a3b1c7a47d8
[INFO] testing CompPrakt21/first-follow-generator against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCompPrakt21%2Ffirst-follow-generator" "/workspace/builds/worker-27/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-27/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CompPrakt21/first-follow-generator 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 git repo https://github.com/CompPrakt21/first-follow-generator
[INFO] finished tweaking git repo https://github.com/CompPrakt21/first-follow-generator
[INFO] tweaked toml for git repo https://github.com/CompPrakt21/first-follow-generator written to /workspace/builds/worker-27/source/Cargo.toml
[INFO] crate git repo https://github.com/CompPrakt21/first-follow-generator already has a lockfile, it will not be regenerated
[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]     Blocking waiting for file lock on package cache
[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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24a020fe887c57cbb0477bd53703af6fb1d58a81f733de3bfbac556f7b5f6ea9
[INFO] running `Command { std: "docker" "start" "-a" "24a020fe887c57cbb0477bd53703af6fb1d58a81f733de3bfbac556f7b5f6ea9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24a020fe887c57cbb0477bd53703af6fb1d58a81f733de3bfbac556f7b5f6ea9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24a020fe887c57cbb0477bd53703af6fb1d58a81f733de3bfbac556f7b5f6ea9", kill_on_drop: false }`
[INFO] [stdout] 24a020fe887c57cbb0477bd53703af6fb1d58a81f733de3bfbac556f7b5f6ea9
[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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] beb55ba3533029810eec004b5b8ca58c0c53f5e0f34da699a2d3c6c7bf56047e
[INFO] running `Command { std: "docker" "start" "-a" "beb55ba3533029810eec004b5b8ca58c0c53f5e0f34da699a2d3c6c7bf56047e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.30
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling serde_derive v1.0.130
[INFO] [stderr]    Compiling libc v0.2.104
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling unicode-width v0.1.9
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling serde_json v1.0.68
[INFO] [stderr]    Compiling bitflags v1.3.2
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling itoa v0.4.8
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling anyhow v1.0.44
[INFO] [stderr]    Compiling minimal-lexical v0.1.4
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling convert_case v0.4.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling nom v7.0.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.33.3
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling structopt-derive v0.4.18
[INFO] [stderr]    Compiling thiserror-impl v1.0.30
[INFO] [stderr]    Compiling derive_more v0.99.16
[INFO] [stderr]    Compiling structopt v0.3.25
[INFO] [stderr]    Compiling thiserror v1.0.30
[INFO] [stderr]    Compiling tinytemplate v1.2.1
[INFO] [stderr]    Compiling first-follow v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `ends_with_non_terms`
[INFO] [stdout]    --> src/grammar/mod.rs:328:8
[INFO] [stdout]     |
[INFO] [stdout] 328 |     fn ends_with_non_terms(&self, sym: &Symbol) -> HashSet<String> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(array_windows)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `first-follow` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "beb55ba3533029810eec004b5b8ca58c0c53f5e0f34da699a2d3c6c7bf56047e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "beb55ba3533029810eec004b5b8ca58c0c53f5e0f34da699a2d3c6c7bf56047e", kill_on_drop: false }`
[INFO] [stdout] beb55ba3533029810eec004b5b8ca58c0c53f5e0f34da699a2d3c6c7bf56047e