[INFO] cloning repository https://github.com/awm/rvfs-sim
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/awm/rvfs-sim" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fawm%2Frvfs-sim", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fawm%2Frvfs-sim'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e9c8703fe55dfdf5ef86c96c2ed5a45251d714f2
[INFO] checking awm/rvfs-sim against try#901e6d56697c79b2e80df6a487b2318ec6f57ee3 for pr-142287
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fawm%2Frvfs-sim" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/awm/rvfs-sim on toolchain 901e6d56697c79b2e80df6a487b2318ec6f57ee3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0-tc2/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/awm/rvfs-sim
[INFO] finished tweaking git repo https://github.com/awm/rvfs-sim
[INFO] tweaked toml for git repo https://github.com/awm/rvfs-sim written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/awm/rvfs-sim 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" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 10af910f7cf9a082d18403e47b8e004edb4f7513e4a89439d333b866c4895940
[INFO] running `Command { std: "docker" "start" "-a" "10af910f7cf9a082d18403e47b8e004edb4f7513e4a89439d333b866c4895940", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10af910f7cf9a082d18403e47b8e004edb4f7513e4a89439d333b866c4895940", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10af910f7cf9a082d18403e47b8e004edb4f7513e4a89439d333b866c4895940", kill_on_drop: false }`
[INFO] [stdout] 10af910f7cf9a082d18403e47b8e004edb4f7513e4a89439d333b866c4895940
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c120bb9d394b6a20e8ab8c6c0d8155ea1ac0c306ca7e7b4fec8e99c65d30c22
[INFO] running `Command { std: "docker" "start" "-a" "3c120bb9d394b6a20e8ab8c6c0d8155ea1ac0c306ca7e7b4fec8e99c65d30c22", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.159
[INFO] [stderr]     Checking rvfs-sim v0.1.0 (/opt/rustwide/workdir/rvfs-sim)
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]     Checking float-cmp v0.10.0
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking rvfs-sim-core v0.1.0 (/opt/rustwide/workdir/rvfs-sim-core)
[INFO] [stdout] error[E0515]: cannot return reference to temporary value
[INFO] [stdout]   --> rvfs-sim-core/src/library.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             &None
[INFO] [stdout]    |             ^----
[INFO] [stdout]    |             ||
[INFO] [stdout]    |             |temporary value created here
[INFO] [stdout]    |             returns a reference to data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rvfs-sim-core` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0515]: cannot return reference to temporary value
[INFO] [stdout]   --> rvfs-sim-core/src/library.rs:45:13
[INFO] [stdout]    |
[INFO] [stdout] 45 |             &None
[INFO] [stdout]    |             ^----
[INFO] [stdout]    |             ||
[INFO] [stdout]    |             |temporary value created here
[INFO] [stdout]    |             returns a reference to data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rvfs-sim-core` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "3c120bb9d394b6a20e8ab8c6c0d8155ea1ac0c306ca7e7b4fec8e99c65d30c22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c120bb9d394b6a20e8ab8c6c0d8155ea1ac0c306ca7e7b4fec8e99c65d30c22", kill_on_drop: false }`
[INFO] [stdout] 3c120bb9d394b6a20e8ab8c6c0d8155ea1ac0c306ca7e7b4fec8e99c65d30c22