[INFO] fetching crate count_set_bits 0.0.18...
[INFO] checking count_set_bits-0.0.18 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate count_set_bits 0.0.18 into /workspace/builds/worker-7-tc2/source
[INFO] removed /workspace/builds/worker-7-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate count_set_bits 0.0.18
[INFO] finished tweaking crates.io crate count_set_bits 0.0.18
[INFO] tweaked toml for crates.io crate count_set_bits 0.0.18 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate count_set_bits 0.0.18 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 count_set_bits 0.0.18 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] ffbbda415548d596a29d2d38dd25dac7db3aa8056cd92977a6af585fe443de0f
[INFO] running `Command { std: "docker" "start" "-a" "ffbbda415548d596a29d2d38dd25dac7db3aa8056cd92977a6af585fe443de0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ffbbda415548d596a29d2d38dd25dac7db3aa8056cd92977a6af585fe443de0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ffbbda415548d596a29d2d38dd25dac7db3aa8056cd92977a6af585fe443de0f", kill_on_drop: false }`
[INFO] [stdout] ffbbda415548d596a29d2d38dd25dac7db3aa8056cd92977a6af585fe443de0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] b9ed647888287063a9fa4d27d36b1ae02e75fc188b36c3980fb5facbd77a57f9
[INFO] running `Command { std: "docker" "start" "-a" "b9ed647888287063a9fa4d27d36b1ae02e75fc188b36c3980fb5facbd77a57f9", kill_on_drop: false }`
[INFO] [stderr]     Checking count_set_bits v0.0.18 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]   --> src/bin/count_set_bits.rs:62:55
[INFO] [stdout]    |
[INFO] [stdout] 62 |                         let set_bits = count_set_bits(num.try_into().unwrap(), true);
[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<u128, Infallible>
[INFO] [stdout]   --> src/bin/count_set_bits.rs:84:55
[INFO] [stdout]    |
[INFO] [stdout] 84 |                         let set_bits = count_set_bits(num.try_into().unwrap(), true);
[INFO] [stdout]    |                                                       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]    --> src/bin/count_set_bits.rs:135:47
[INFO] [stdout]     |
[INFO] [stdout] 135 |                 let set_bits = count_set_bits(num.try_into().unwrap(), true);
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]    --> src/bin/count_set_bits.rs:150:47
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 let set_bits = count_set_bits(num.try_into().unwrap(), true);
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `count_set_bits` (bin "count_set_bits") due to 4 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]   --> src/bin/count_set_bits.rs:62:55
[INFO] [stdout]    |
[INFO] [stdout] 62 |                         let set_bits = count_set_bits(num.try_into().unwrap(), true);
[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<u128, Infallible>
[INFO] [stdout]   --> src/bin/count_set_bits.rs:84:55
[INFO] [stdout]    |
[INFO] [stdout] 84 |                         let set_bits = count_set_bits(num.try_into().unwrap(), true);
[INFO] [stdout]    |                                                       ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]    --> src/bin/count_set_bits.rs:135:47
[INFO] [stdout]     |
[INFO] [stdout] 135 |                 let set_bits = count_set_bits(num.try_into().unwrap(), true);
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u128, Infallible>
[INFO] [stdout]    --> src/bin/count_set_bits.rs:150:47
[INFO] [stdout]     |
[INFO] [stdout] 150 |                 let set_bits = count_set_bits(num.try_into().unwrap(), true);
[INFO] [stdout]     |                                               ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `count_set_bits` (bin "count_set_bits" test) due to 4 previous errors
[INFO] running `Command { std: "docker" "inspect" "b9ed647888287063a9fa4d27d36b1ae02e75fc188b36c3980fb5facbd77a57f9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b9ed647888287063a9fa4d27d36b1ae02e75fc188b36c3980fb5facbd77a57f9", kill_on_drop: false }`
[INFO] [stdout] b9ed647888287063a9fa4d27d36b1ae02e75fc188b36c3980fb5facbd77a57f9