[INFO] fetching crate cargo-referendum 0.1.1...
[INFO] checking cargo-referendum-0.1.1 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate cargo-referendum 0.1.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate cargo-referendum 0.1.1
[INFO] finished tweaking crates.io crate cargo-referendum 0.1.1
[INFO] tweaked toml for crates.io crate cargo-referendum 0.1.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate cargo-referendum 0.1.1 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 cargo-referendum 0.1.1 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] b05473bab7f69a3ade733afcc6956182e12a08485923218d4ad4e6ab3863e7bc
[INFO] running `Command { std: "docker" "start" "-a" "b05473bab7f69a3ade733afcc6956182e12a08485923218d4ad4e6ab3863e7bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b05473bab7f69a3ade733afcc6956182e12a08485923218d4ad4e6ab3863e7bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b05473bab7f69a3ade733afcc6956182e12a08485923218d4ad4e6ab3863e7bc", kill_on_drop: false }`
[INFO] [stdout] b05473bab7f69a3ade733afcc6956182e12a08485923218d4ad4e6ab3863e7bc
[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] fde3b2d222391ba44e9a98fef9cc4d13adc819d6d9c6d7f3a40cb6d020ffdcb2
[INFO] running `Command { std: "docker" "start" "-a" "fde3b2d222391ba44e9a98fef9cc4d13adc819d6d9c6d7f3a40cb6d020ffdcb2", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.97
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling gcc v0.3.55
[INFO] [stderr]    Compiling syn v1.0.73
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]     Checking seahash v3.0.7
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking string-builder v0.2.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling fasthash-sys v0.3.2
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking xoroshiro128 v0.3.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]    Compiling thiserror-impl v1.0.25
[INFO] [stderr]     Checking thiserror v1.0.25
[INFO] [stderr]     Checking fasthash v0.4.0
[INFO] [stderr]     Checking cargo-referendum v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/lib.rs:59:30
[INFO] [stdout]    |
[INFO] [stdout] 59 |         .filter_map(|digits| digits.as_str().parse().ok())
[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: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/lib.rs:75:30
[INFO] [stdout]    |
[INFO] [stdout] 75 |         .filter_map(|digits| digits.as_str().parse().ok())
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/lib.rs:80:30
[INFO] [stdout]    |
[INFO] [stdout] 80 |         .filter_map(|digits| digits.as_str().parse().ok())
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/lib.rs:59:30
[INFO] [stdout]    |
[INFO] [stdout] 59 |         .filter_map(|digits| digits.as_str().parse().ok())
[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: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/lib.rs:75:30
[INFO] [stdout]    |
[INFO] [stdout] 75 |         .filter_map(|digits| digits.as_str().parse().ok())
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<String, Infallible>
[INFO] [stdout]   --> src/lib.rs:80:30
[INFO] [stdout]    |
[INFO] [stdout] 80 |         .filter_map(|digits| digits.as_str().parse().ok())
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `cargo-referendum` (lib) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `cargo-referendum` (lib test) due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "fde3b2d222391ba44e9a98fef9cc4d13adc819d6d9c6d7f3a40cb6d020ffdcb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fde3b2d222391ba44e9a98fef9cc4d13adc819d6d9c6d7f3a40cb6d020ffdcb2", kill_on_drop: false }`
[INFO] [stdout] fde3b2d222391ba44e9a98fef9cc4d13adc819d6d9c6d7f3a40cb6d020ffdcb2