[INFO] fetching crate kv-par-merge-sort 0.1.0...
[INFO] checking kv-par-merge-sort-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate kv-par-merge-sort 0.1.0 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate kv-par-merge-sort 0.1.0
[INFO] finished tweaking crates.io crate kv-par-merge-sort 0.1.0
[INFO] tweaked toml for crates.io crate kv-par-merge-sort 0.1.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate kv-par-merge-sort 0.1.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate kv-par-merge-sort 0.1.0 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "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-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 29748e1ba6738a37ecf17fff40913154277910147f4b1560ddbb90c91f08f2be
[INFO] running `Command { std: "docker" "start" "-a" "29748e1ba6738a37ecf17fff40913154277910147f4b1560ddbb90c91f08f2be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "29748e1ba6738a37ecf17fff40913154277910147f4b1560ddbb90c91f08f2be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "29748e1ba6738a37ecf17fff40913154277910147f4b1560ddbb90c91f08f2be", kill_on_drop: false }`
[INFO] [stdout] 29748e1ba6738a37ecf17fff40913154277910147f4b1560ddbb90c91f08f2be
[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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3676cfd825de7c60e861ff98896e10e9cde9f93a4c6f3d0cd8b5b2a7eb3bb87f
[INFO] running `Command { std: "docker" "start" "-a" "3676cfd825de7c60e861ff98896e10e9cde9f93a4c6f3d0cd8b5b2a7eb3bb87f", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]    Compiling crossbeam-queue v0.3.5
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking once_cell v1.12.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking hashbrown v0.11.2
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking tracing-core v0.1.26
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]     Checking fastrand v1.7.0
[INFO] [stderr]     Checking os_str_bytes v6.1.0
[INFO] [stderr]     Checking termcolor v1.1.3
[INFO] [stderr]     Checking ansi_term v0.12.1
[INFO] [stderr]    Compiling heck v0.4.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking thread_local v1.1.4
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]     Checking remove_dir_all v0.5.3
[INFO] [stderr]     Checking clap_lex v0.2.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]     Checking strsim v0.10.0
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking tracing-log v0.1.3
[INFO] [stderr]     Checking bytemuck v1.9.1
[INFO] [stderr]     Checking textwrap v0.15.0
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking tempfile v3.3.0
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling indexmap v1.8.2
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking json v0.12.4
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking tracing-subscriber v0.3.11
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking crossbeam-channel v0.5.4
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]     Checking crossbeam v0.8.1
[INFO] [stderr]     Checking env_logger v0.9.0
[INFO] [stderr]    Compiling tracing-attributes v0.1.21
[INFO] [stderr]    Compiling clap_derive v3.1.18
[INFO] [stderr]     Checking tracing v0.1.34
[INFO] [stderr]     Checking tracing-chrome v0.6.0
[INFO] [stderr]     Checking kv-par-merge-sort v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking clap v3.1.18
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> examples/large_data_set.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 | /     #[clap(short = 'o', long)]
[INFO] [stdout] 13 | |     output_dir: PathBuf,
[INFO] [stdout]    | |_______________________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<PathBuf, Infallible>
[INFO] [stdout]   --> examples/large_data_set.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 | /     #[clap(short = 't', long)]
[INFO] [stdout] 15 | |     temp_dir: PathBuf,
[INFO] [stdout]    | |_____________________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `kv-par-merge-sort` (example "large_data_set") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "3676cfd825de7c60e861ff98896e10e9cde9f93a4c6f3d0cd8b5b2a7eb3bb87f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3676cfd825de7c60e861ff98896e10e9cde9f93a4c6f3d0cd8b5b2a7eb3bb87f", kill_on_drop: false }`
[INFO] [stdout] 3676cfd825de7c60e861ff98896e10e9cde9f93a4c6f3d0cd8b5b2a7eb3bb87f