[INFO] fetching crate artlr_syntax 0.3.0...
[INFO] checking artlr_syntax-0.3.0 against master#38352b01ae4af9300be03b805d6db68c45e51068 for pr-129864
[INFO] extracting crate artlr_syntax 0.3.0 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate artlr_syntax 0.3.0 on toolchain 38352b01ae4af9300be03b805d6db68c45e51068
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate artlr_syntax 0.3.0
[INFO] finished tweaking crates.io crate artlr_syntax 0.3.0
[INFO] tweaked toml for crates.io crate artlr_syntax 0.3.0 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b93aecfbe602c61aaf736d5e1a3b70001d20409fbca9af0cb6e86e3469be2b1e
[INFO] running `Command { std: "docker" "start" "-a" "b93aecfbe602c61aaf736d5e1a3b70001d20409fbca9af0cb6e86e3469be2b1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b93aecfbe602c61aaf736d5e1a3b70001d20409fbca9af0cb6e86e3469be2b1e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b93aecfbe602c61aaf736d5e1a3b70001d20409fbca9af0cb6e86e3469be2b1e", kill_on_drop: false }`
[INFO] [stdout] b93aecfbe602c61aaf736d5e1a3b70001d20409fbca9af0cb6e86e3469be2b1e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:ceb6ea022f8a89cebbe621bb4987e73a935bd40dfbb726f832cfff4742a5b95a" "/opt/rustwide/cargo-home/bin/cargo" "+38352b01ae4af9300be03b805d6db68c45e51068" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 162f2f27f04cda5245155e21387fbc3f2fd80701c534af8dec4f9591d18ad3c6
[INFO] running `Command { std: "docker" "start" "-a" "162f2f27f04cda5245155e21387fbc3f2fd80701c534af8dec4f9591d18ad3c6", kill_on_drop: false }`
[INFO] [stderr]     Checking artlr_syntax v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/grammar/first_follow_symbols.rs:296:45
[INFO] [stdout]     |
[INFO] [stdout] 296 |                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout]     |                                             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `HashSet<T>` does not implement `Borrow`, so calling `borrow` on `&HashSet<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 296 -                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout] 296 +                 .get(output_symbol).unwrap();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/grammar/first_follow_symbols.rs:296:45
[INFO] [stdout]     |
[INFO] [stdout] 296 |                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout]     |                                             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `HashSet<T>` does not implement `Borrow`, so calling `borrow` on `&HashSet<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 296 -                 .get(output_symbol).unwrap().borrow();
[INFO] [stdout] 296 +                 .get(output_symbol).unwrap();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "162f2f27f04cda5245155e21387fbc3f2fd80701c534af8dec4f9591d18ad3c6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "162f2f27f04cda5245155e21387fbc3f2fd80701c534af8dec4f9591d18ad3c6", kill_on_drop: false }`
[INFO] [stdout] 162f2f27f04cda5245155e21387fbc3f2fd80701c534af8dec4f9591d18ad3c6