[INFO] fetching crate word_counter 0.3.0... [INFO] checking word_counter-0.3.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577 [INFO] extracting crate word_counter 0.3.0 into /workspace/builds/worker-6-tc2/source [INFO] started tweaking crates.io crate word_counter 0.3.0 [INFO] finished tweaking crates.io crate word_counter 0.3.0 [INFO] tweaked toml for crates.io crate word_counter 0.3.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate word_counter 0.3.0 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 word_counter 0.3.0 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] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f50e4c47e48285e409378ea511a55fab5fdf0fe9f3fe02a2e3427d099e41c320 [INFO] running `Command { std: "docker" "start" "-a" "f50e4c47e48285e409378ea511a55fab5fdf0fe9f3fe02a2e3427d099e41c320", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "f50e4c47e48285e409378ea511a55fab5fdf0fe9f3fe02a2e3427d099e41c320", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "f50e4c47e48285e409378ea511a55fab5fdf0fe9f3fe02a2e3427d099e41c320", kill_on_drop: false }` [INFO] [stdout] f50e4c47e48285e409378ea511a55fab5fdf0fe9f3fe02a2e3427d099e41c320 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 9f28b102aab2a0f68ebaa266b019a77f4865c4cddf907202ddb09b47f6498d7b [INFO] running `Command { std: "docker" "start" "-a" "9f28b102aab2a0f68ebaa266b019a77f4865c4cddf907202ddb09b47f6498d7b", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.28 [INFO] [stderr] Compiling libc v0.2.100 [INFO] [stderr] Compiling memchr v2.4.1 [INFO] [stderr] Compiling serde v1.0.127 [INFO] [stderr] Compiling syn v1.0.75 [INFO] [stderr] Compiling unicode-segmentation v1.8.0 [INFO] [stderr] Checking byteorder v1.4.3 [INFO] [stderr] Checking encode_unicode v0.3.6 [INFO] [stderr] Compiling heck v0.3.3 [INFO] [stderr] Compiling quote v1.0.9 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking dirs v1.0.5 [INFO] [stderr] Checking term v0.5.2 [INFO] [stderr] Checking clap v2.33.3 [INFO] [stderr] Compiling proc-macro-error-attr v1.0.4 [INFO] [stderr] Checking csv-core v0.1.10 [INFO] [stderr] Compiling proc-macro-error v1.0.4 [INFO] [stderr] Checking bstr v0.2.16 [INFO] [stderr] Compiling structopt-derive v0.4.15 [INFO] [stderr] Checking csv v1.1.6 [INFO] [stderr] Checking prettytable-rs v0.8.0 [INFO] [stderr] Checking structopt v0.3.22 [INFO] [stderr] Checking word_counter v0.3.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: field `output` is never read [INFO] [stdout] --> src/lib.rs:48:5 [INFO] [stdout] | [INFO] [stdout] 21 | pub struct Opt { [INFO] [stdout] | --- field in this struct [INFO] [stdout] ... [INFO] [stdout] 48 | output: Option, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this type will no longer be must used: Result [INFO] [stdout] --> src/lib.rs:34:5 [INFO] [stdout] | [INFO] [stdout] 34 | / /// Search specific word [INFO] [stdout] 35 | | #[structopt(short = "s", long = "--search")] [INFO] [stdout] 36 | | search: Option, [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 `word_counter` (lib test) due to 1 previous error; 1 warning emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stdout] warning: field `output` is never read [INFO] [stdout] --> src/lib.rs:48:5 [INFO] [stdout] | [INFO] [stdout] 21 | pub struct Opt { [INFO] [stdout] | --- field in this struct [INFO] [stdout] ... [INFO] [stdout] 48 | output: Option, [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `Opt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this type will no longer be must used: Result [INFO] [stdout] --> src/lib.rs:34:5 [INFO] [stdout] | [INFO] [stdout] 34 | / /// Search specific word [INFO] [stdout] 35 | | #[structopt(short = "s", long = "--search")] [INFO] [stdout] 36 | | search: Option, [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 `word_counter` (lib) due to 1 previous error; 1 warning emitted [INFO] running `Command { std: "docker" "inspect" "9f28b102aab2a0f68ebaa266b019a77f4865c4cddf907202ddb09b47f6498d7b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "9f28b102aab2a0f68ebaa266b019a77f4865c4cddf907202ddb09b47f6498d7b", kill_on_drop: false }` [INFO] [stdout] 9f28b102aab2a0f68ebaa266b019a77f4865c4cddf907202ddb09b47f6498d7b