[INFO] fetching crate artlr_syntax 0.3.0...
[INFO] checking artlr_syntax-0.3.0 against try#c387b04bf028733cd561d62128c8a5eee4bc1458+rustflags=-Dtail_expr_drop_order for pr-130930
[INFO] extracting crate artlr_syntax 0.3.0 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate artlr_syntax 0.3.0 on toolchain c387b04bf028733cd561d62128c8a5eee4bc1458
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "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-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "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" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 45d295bf9dfcb88e3541b878c956e8f19c2909ff6e810dd7e64057bebf5bb788
[INFO] running `Command { std: "docker" "start" "-a" "45d295bf9dfcb88e3541b878c956e8f19c2909ff6e810dd7e64057bebf5bb788", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "45d295bf9dfcb88e3541b878c956e8f19c2909ff6e810dd7e64057bebf5bb788", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "45d295bf9dfcb88e3541b878c956e8f19c2909ff6e810dd7e64057bebf5bb788", kill_on_drop: false }`
[INFO] [stdout] 45d295bf9dfcb88e3541b878c956e8f19c2909ff6e810dd7e64057bebf5bb788
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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 -Dtail_expr_drop_order" "-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@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+c387b04bf028733cd561d62128c8a5eee4bc1458" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 77e40d294846874583256f2c5627b871066e01f1dadc2d6b0779c28126bc083b
[INFO] running `Command { std: "docker" "start" "-a" "77e40d294846874583256f2c5627b871066e01f1dadc2d6b0779c28126bc083b", 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 0.25s
[INFO] running `Command { std: "docker" "inspect" "77e40d294846874583256f2c5627b871066e01f1dadc2d6b0779c28126bc083b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "77e40d294846874583256f2c5627b871066e01f1dadc2d6b0779c28126bc083b", kill_on_drop: false }`
[INFO] [stdout] 77e40d294846874583256f2c5627b871066e01f1dadc2d6b0779c28126bc083b