[INFO] fetching crate tuc 1.3.0...
[INFO] checking tuc-1.3.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate tuc 1.3.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate tuc 1.3.0
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate tuc 1.3.0
[INFO] tweaked toml for crates.io crate tuc 1.3.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tuc 1.3.0 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 tuc 1.3.0 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] 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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0e0094a784d7fd6300e6efa8e8e74fa0623598bd5977430a57f73080491db18a
[INFO] running `Command { std: "docker" "start" "-a" "0e0094a784d7fd6300e6efa8e8e74fa0623598bd5977430a57f73080491db18a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0e0094a784d7fd6300e6efa8e8e74fa0623598bd5977430a57f73080491db18a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0e0094a784d7fd6300e6efa8e8e74fa0623598bd5977430a57f73080491db18a", kill_on_drop: false }`
[INFO] [stdout] 0e0094a784d7fd6300e6efa8e8e74fa0623598bd5977430a57f73080491db18a
[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 -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] 0ee7e657c960a5231d5279c715a58c1a0716bb9710cbe202b18337bde7461da5
[INFO] running `Command { std: "docker" "start" "-a" "0ee7e657c960a5231d5279c715a58c1a0716bb9710cbe202b18337bde7461da5", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.155
[INFO] [stderr]     Checking aho-corasick v1.1.2
[INFO] [stderr]    Compiling serde v1.0.196
[INFO] [stderr]     Checking ryu v1.0.16
[INFO] [stderr]    Compiling assert_cmd v2.0.17
[INFO] [stderr]     Checking pico-args v0.5.0
[INFO] [stderr]     Checking anstyle v1.0.0
[INFO] [stderr]     Checking predicates-tree v1.0.2
[INFO] [stderr]     Checking predicates v3.1.3
[INFO] [stderr]     Checking memmap2 v0.9.8
[INFO] [stderr]     Checking wait-timeout v0.2.0
[INFO] [stderr]     Checking regex-automata v0.4.8
[INFO] [stderr]     Checking serde_json v1.0.143
[INFO] [stderr]     Checking bstr v1.12.0
[INFO] [stderr]     Checking regex v1.11.2
[INFO] [stderr]     Checking tuc v1.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<Opt, !>
[INFO] [stdout]   --> src/bin/tuc.rs:71:20
[INFO] [stdout]    |
[INFO] [stdout] 71 |       let opt: Opt = args
[INFO] [stdout]    |  ____________________^
[INFO] [stdout] 72 | |         .try_into()
[INFO] [stdout] 73 | |         .map_err(|e| {
[INFO] [stdout] 74 | |             eprintln!("{}", e);
[INFO] [stdout] 75 | |             std::process::exit(1);
[INFO] [stdout] 76 | |         })
[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<Opt, !>
[INFO] [stdout]   --> src/bin/tuc.rs:71:20
[INFO] [stdout]    |
[INFO] [stdout] 71 |       let opt: Opt = args
[INFO] [stdout]    |  ____________________^
[INFO] [stdout] 72 | |         .try_into()
[INFO] [stdout] 73 | |         .map_err(|e| {
[INFO] [stdout] 74 | |             eprintln!("{}", e);
[INFO] [stdout] 75 | |             std::process::exit(1);
[INFO] [stdout] 76 | |         })
[INFO] [stdout]    | |__________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tuc` (bin "tuc" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `tuc` (bin "tuc") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "0ee7e657c960a5231d5279c715a58c1a0716bb9710cbe202b18337bde7461da5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0ee7e657c960a5231d5279c715a58c1a0716bb9710cbe202b18337bde7461da5", kill_on_drop: false }`
[INFO] [stdout] 0ee7e657c960a5231d5279c715a58c1a0716bb9710cbe202b18337bde7461da5