[INFO] cloning repository https://github.com/nrxus/advent_of_code
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nrxus/advent_of_code" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnrxus%2Fadvent_of_code", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnrxus%2Fadvent_of_code'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b038001d31bc6171e29bf2ac963c8067bf692333
[INFO] testing nrxus/advent_of_code against 1.54.0 for beta-1.55-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnrxus%2Fadvent_of_code" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/nrxus/advent_of_code on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/nrxus/advent_of_code
[INFO] finished tweaking git repo https://github.com/nrxus/advent_of_code
[INFO] tweaked toml for git repo https://github.com/nrxus/advent_of_code written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/nrxus/advent_of_code already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a7e8f0e5dbc2ca54a227f41be04f79f6f6c6bdf8405a58c1734c4b6a5182f2f4
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a7e8f0e5dbc2ca54a227f41be04f79f6f6c6bdf8405a58c1734c4b6a5182f2f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a7e8f0e5dbc2ca54a227f41be04f79f6f6c6bdf8405a58c1734c4b6a5182f2f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a7e8f0e5dbc2ca54a227f41be04f79f6f6c6bdf8405a58c1734c4b6a5182f2f4", kill_on_drop: false }`
[INFO] [stdout] a7e8f0e5dbc2ca54a227f41be04f79f6f6c6bdf8405a58c1734c4b6a5182f2f4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3959ad072a9900a7012dc3e174d09ba52471c57c302fe975e71dffe68c2a4901
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "3959ad072a9900a7012dc3e174d09ba52471c57c302fe975e71dffe68c2a4901", kill_on_drop: false }`
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_01a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_01a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_01a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_01b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_01b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_01b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_02a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_02a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_02a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_02b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_02b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_02b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_03a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_03a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_03a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_03b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_03b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_03b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_04a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_04a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_04a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_04b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_04b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_04b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_05a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_05a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_05a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_05b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_05b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_05b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_06a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_06a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_06a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_06b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_06b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_06b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_07a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_07a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_07a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_07b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_07b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_07b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_08a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_08a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_08a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_08b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_08b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_08b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_09a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_09a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_09a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_09b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_09b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_09b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_10a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_10a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_10a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_10b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_10b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_10b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_11a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_11a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_11a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_11b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_11b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_11b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_12a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_12a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_12a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_12b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_12b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_12b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_13a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_13a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_13a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_13b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_13b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_13b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_14a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_14a` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_14a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_14b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)` has the same output filename as the bin target `day_14b` in package `twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_14b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_01a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_01a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_01a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_01b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_01b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_01b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_02a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_02a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_02a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_02b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_02b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_02b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_03a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_03a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_03a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_03b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_03b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_03b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_04a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_04a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_04a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_04b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_04b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_04b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_05a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_05a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_05a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_05b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)` has the same output filename as the bin target `day_05b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_05b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_01a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_01a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_01a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_01b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_01b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_01b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_02a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_02a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_02a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_02b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_02b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_02b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_03a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_03a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_03a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_03b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_03b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_03b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_04a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_04a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_04a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_04b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_04b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_04b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_05a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_05a` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_05a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_05b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_05b` in package `twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_05b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_06a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_06a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_06a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_06b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_06b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_06b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_07a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_07a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_07a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_07b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_07b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_07b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_08a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_08a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_08a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_08b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_08b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_08b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_09a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_09a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_09a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_09b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_09b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_09b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_10a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_10a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_10a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_10b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_10b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_10b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_11a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_11a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_11a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_11b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_11b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_11b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_12a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_12a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_12a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_12b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_12b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_12b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_13a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_13a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_13a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_13b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_13b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_13b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_14a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_14a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_14a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_14b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_14b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_14b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_15a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_15a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_15a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_15b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_15b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_15b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_16a` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_16a` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_16a
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr] warning: output filename collision.
[INFO] [stderr] The bin target `day_16b` in package `twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)` has the same output filename as the bin target `day_16b` in package `twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)`.
[INFO] [stderr] Colliding filename is: /opt/rustwide/target/debug/day_16b
[INFO] [stderr] The targets should have unique names.
[INFO] [stderr] Consider changing their names to be unique or compiling them separately.
[INFO] [stderr] This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
[INFO] [stderr]    Compiling common v0.1.0 (/opt/rustwide/workdir/common)
[INFO] [stderr]    Compiling syn v1.0.53
[INFO] [stderr]    Compiling serde v1.0.101
[INFO] [stderr]    Compiling libc v0.2.80
[INFO] [stderr]    Compiling autocfg v0.1.6
[INFO] [stderr]    Compiling pkg-config v0.3.16
[INFO] [stderr]    Compiling openssl v0.10.25
[INFO] [stderr]    Compiling futures-task v0.3.8
[INFO] [stderr]    Compiling unicode-segmentation v1.3.0
[INFO] [stderr]    Compiling tap v1.0.0
[INFO] [stderr]    Compiling funty v1.0.1
[INFO] [stderr]    Compiling strum v0.20.0
[INFO] [stderr]    Compiling intcode v0.1.0 (/opt/rustwide/workdir/intcode)
[INFO] [stderr]    Compiling bit-vec v0.6.2
[INFO] [stderr]    Compiling itertools v0.9.0
[INFO] [stderr]    Compiling unicase v2.5.1
[INFO] [stderr]    Compiling standback v0.2.13
[INFO] [stderr]    Compiling http v0.2.1
[INFO] [stderr]    Compiling futures-channel v0.3.8
[INFO] [stderr]    Compiling time v0.2.23
[INFO] [stderr]    Compiling cookie v0.14.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling idna v0.2.0
[INFO] [stderr]    Compiling tracing v0.1.22
[INFO] [stderr]    Compiling want v0.3.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling regex v1.4.2
[INFO] [stderr]    Compiling indexmap v1.3.0
[INFO] [stderr]    Compiling bitvec v0.19.4
[INFO] [stderr]    Compiling openssl-sys v0.9.51
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]    Compiling mime_guess v2.0.1
[INFO] [stderr]    Compiling url v2.2.0
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling net2 v0.2.33
[INFO] [stderr]    Compiling socket2 v0.3.17
[INFO] [stderr]    Compiling num_cpus v1.10.1
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling mio v0.6.22
[INFO] [stderr]    Compiling native-tls v0.2.3
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling http-body v0.3.1
[INFO] [stderr]    Compiling tokio v0.2.23
[INFO] [stderr]    Compiling twenty-sixteen v0.1.0 (/opt/rustwide/workdir/2016)
[INFO] [stderr]    Compiling twenty-twenty v0.1.0 (/opt/rustwide/workdir/2020)
[INFO] [stderr]    Compiling serde_urlencoded v0.7.0
[INFO] [stderr]    Compiling serde_json v1.0.59
[INFO] [stderr]    Compiling tokio-util v0.3.1
[INFO] [stderr]    Compiling tokio-tls v0.3.1
[INFO] [stderr]    Compiling twenty-fifteen v0.1.0 (/opt/rustwide/workdir/2015)
[INFO] [stderr]    Compiling enum-map-derive v0.4.3
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]    Compiling pin-project-internal v1.0.2
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling strum_macros v0.20.1
[INFO] [stderr]    Compiling enum-map v0.6.4
[INFO] [stderr]    Compiling time-macros v0.1.1
[INFO] [stderr]    Compiling twenty-nineteen v0.1.0 (/opt/rustwide/workdir/2019)
[INFO] [stderr]    Compiling pin-project v1.0.2
[INFO] [stderr]    Compiling pin-project v0.4.27
[INFO] [stderr]    Compiling futures-util v0.3.8
[INFO] [stderr]    Compiling tracing-futures v0.2.4
[INFO] [stderr]    Compiling h2 v0.2.7
[INFO] [stderr]    Compiling hyper v0.13.9
[INFO] [stderr]    Compiling hyper-tls v0.4.3
[INFO] [stderr]    Compiling reqwest v0.10.9
[INFO] [stderr]    Compiling twenty-eighteen v0.1.0 (/opt/rustwide/workdir/2018)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> 2018/src/twenty_five.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(drain_filter)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `twenty-eighteen`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3959ad072a9900a7012dc3e174d09ba52471c57c302fe975e71dffe68c2a4901", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3959ad072a9900a7012dc3e174d09ba52471c57c302fe975e71dffe68c2a4901", kill_on_drop: false }`
[INFO] [stdout] 3959ad072a9900a7012dc3e174d09ba52471c57c302fe975e71dffe68c2a4901
