[INFO] fetching crate wordtop 0.1.6... [INFO] checking wordtop-0.1.6 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577 [INFO] extracting crate wordtop 0.1.6 into /workspace/builds/worker-6-tc2/source [INFO] started tweaking crates.io crate wordtop 0.1.6 [INFO] finished tweaking crates.io crate wordtop 0.1.6 [INFO] tweaked toml for crates.io crate wordtop 0.1.6 written to /workspace/builds/worker-6-tc2/source/Cargo.toml [INFO] validating manifest of crates.io crate wordtop 0.1.6 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 wordtop 0.1.6 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-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] a0a550df573f13257f40373c68571b5e71bbd101cde7d31825cc42de2d205230 [INFO] running `Command { std: "docker" "start" "-a" "a0a550df573f13257f40373c68571b5e71bbd101cde7d31825cc42de2d205230", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "a0a550df573f13257f40373c68571b5e71bbd101cde7d31825cc42de2d205230", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "a0a550df573f13257f40373c68571b5e71bbd101cde7d31825cc42de2d205230", kill_on_drop: false }` [INFO] [stdout] a0a550df573f13257f40373c68571b5e71bbd101cde7d31825cc42de2d205230 [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] 367d4fe9078a14cfc972af10afaf0deed17bfa2329dbba3b8d13e39cfbf68b79 [INFO] running `Command { std: "docker" "start" "-a" "367d4fe9078a14cfc972af10afaf0deed17bfa2329dbba3b8d13e39cfbf68b79", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.108 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking nix v0.23.0 [INFO] [stderr] Checking clap v2.34.0 [INFO] [stderr] Checking ctrlc v3.2.1 [INFO] [stderr] Checking wordtop v0.1.6 (/opt/rustwide/workdir) [INFO] [stdout] warning: value assigned to `count` is never read [INFO] [stdout] --> src/print.rs:21:17 [INFO] [stdout] | [INFO] [stdout] 21 | count = 0; [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: value assigned to `count` is never read [INFO] [stdout] --> src/print.rs:21:17 [INFO] [stdout] | [INFO] [stdout] 21 | count = 0; [INFO] [stdout] | ^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = help: maybe it is overwritten before being read? [INFO] [stdout] = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/print.rs:76:14 [INFO] [stdout] | [INFO] [stdout] 76 | let (mut k, mut t) = print_stats(&x, 10, 10); [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] --> src/print.rs:76:21 [INFO] [stdout] | [INFO] [stdout] 76 | let (mut k, mut t) = print_stats(&x, 10, 10); [INFO] [stdout] | ----^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `k` [INFO] [stdout] --> src/print.rs:76:14 [INFO] [stdout] | [INFO] [stdout] 76 | let (mut k, mut t) = print_stats(&x, 10, 10); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_k` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused variable: `t` [INFO] [stdout] --> src/print.rs:76:21 [INFO] [stdout] | [INFO] [stdout] 76 | let (mut k, mut t) = print_stats(&x, 10, 10); [INFO] [stdout] | ^^^^^ help: if this is intentional, prefix it with an underscore: `_t` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] error: this type will no longer be must used: Result [INFO] [stdout] --> src/main.rs:73:13 [INFO] [stdout] | [INFO] [stdout] 73 | let s = matches [INFO] [stdout] | _____________^ [INFO] [stdout] 74 | | .value_of("sort") [INFO] [stdout] 75 | | .expect("sort can't be none") [INFO] [stdout] 76 | | .parse::() [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 [INFO] [stdout] --> src/main.rs:73:13 [INFO] [stdout] | [INFO] [stdout] 73 | let s = matches [INFO] [stdout] | _____________^ [INFO] [stdout] 74 | | .value_of("sort") [INFO] [stdout] 75 | | .expect("sort can't be none") [INFO] [stdout] 76 | | .parse::() [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 `wordtop` (bin "wordtop") due to 1 previous error; 1 warning emitted [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] [stderr] error: could not compile `wordtop` (bin "wordtop" test) due to 1 previous error; 5 warnings emitted [INFO] running `Command { std: "docker" "inspect" "367d4fe9078a14cfc972af10afaf0deed17bfa2329dbba3b8d13e39cfbf68b79", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "367d4fe9078a14cfc972af10afaf0deed17bfa2329dbba3b8d13e39cfbf68b79", kill_on_drop: false }` [INFO] [stdout] 367d4fe9078a14cfc972af10afaf0deed17bfa2329dbba3b8d13e39cfbf68b79