[INFO] fetching crate untyped-arena 0.1.1...
[INFO] testing untyped-arena-0.1.1 against try#2440211fe03bc45c89b6dc1a3df18382ce91e32b for pr-146098-1
[INFO] extracting crate untyped-arena 0.1.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate untyped-arena 0.1.1
[INFO] finished tweaking crates.io crate untyped-arena 0.1.1
[INFO] tweaked toml for crates.io crate untyped-arena 0.1.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate untyped-arena 0.1.1 on toolchain 2440211fe03bc45c89b6dc1a3df18382ce91e32b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate untyped-arena 0.1.1 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" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 781eedc23d78413342ef395f36d9fe44f27726ef46151d39cc15ec8f3179d2e2
[INFO] running `Command { std: "docker" "start" "-a" "781eedc23d78413342ef395f36d9fe44f27726ef46151d39cc15ec8f3179d2e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "781eedc23d78413342ef395f36d9fe44f27726ef46151d39cc15ec8f3179d2e2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "781eedc23d78413342ef395f36d9fe44f27726ef46151d39cc15ec8f3179d2e2", kill_on_drop: false }`
[INFO] [stdout] 781eedc23d78413342ef395f36d9fe44f27726ef46151d39cc15ec8f3179d2e2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dbfa9c38661de6610b7e599214af0af06898914a5680a690cf4213b8dafcfacf
[INFO] running `Command { std: "docker" "start" "-a" "dbfa9c38661de6610b7e599214af0af06898914a5680a690cf4213b8dafcfacf", kill_on_drop: false }`
[INFO] [stderr]    Compiling untyped-arena v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "dbfa9c38661de6610b7e599214af0af06898914a5680a690cf4213b8dafcfacf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbfa9c38661de6610b7e599214af0af06898914a5680a690cf4213b8dafcfacf", kill_on_drop: false }`
[INFO] [stdout] dbfa9c38661de6610b7e599214af0af06898914a5680a690cf4213b8dafcfacf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b00793ea013f02dde3c6091c2d9d40b1d4d3a405df98d47d179d4661da1f88d9
[INFO] running `Command { std: "docker" "start" "-a" "b00793ea013f02dde3c6091c2d9d40b1d4d3a405df98d47d179d4661da1f88d9", kill_on_drop: false }`
[INFO] [stderr]    Compiling untyped-arena v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/dropck_tests.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let mut a = arena.alloc(A::default());
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> examples/dropck_tests.rs:30:9
[INFO] [stdout]    |
[INFO] [stdout] 30 |     let mut b = arena.alloc(A::default());
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0597]: `arena` does not live long enough
[INFO] [stdout]   --> examples/dropck_tests.rs:29:17
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let arena = Arena::new();
[INFO] [stdout]    |         ----- binding `arena` declared here
[INFO] [stdout] 29 |     let mut a = arena.alloc(A::default());
[INFO] [stdout]    |                 ^^^^^ borrowed value does not live long enough
[INFO] [stdout] ...
[INFO] [stdout] 32 | }
[INFO] [stdout]    | -
[INFO] [stdout]    | |
[INFO] [stdout]    | `arena` dropped here while still borrowed
[INFO] [stdout]    | borrow might be used here, when `arena` is dropped and runs the `Drop` code for type `Arena`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0597`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `untyped-arena` (example "dropck_tests") due to 1 previous error; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "b00793ea013f02dde3c6091c2d9d40b1d4d3a405df98d47d179d4661da1f88d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b00793ea013f02dde3c6091c2d9d40b1d4d3a405df98d47d179d4661da1f88d9", kill_on_drop: false }`
[INFO] [stdout] b00793ea013f02dde3c6091c2d9d40b1d4d3a405df98d47d179d4661da1f88d9