[INFO] cloning repository https://github.com/taybart/hyperloglog
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/taybart/hyperloglog" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftaybart%2Fhyperloglog", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftaybart%2Fhyperloglog'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 94c8bf4d4ed339549c7b5c9c5999b25a818adafd
[INFO] checking taybart/hyperloglog against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftaybart%2Fhyperloglog" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/taybart/hyperloglog
[INFO] finished tweaking git repo https://github.com/taybart/hyperloglog
[INFO] tweaked toml for git repo https://github.com/taybart/hyperloglog written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/taybart/hyperloglog 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 git repo https://github.com/taybart/hyperloglog 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] 5a55c247fe1ced8ec50177fd2662a3c9388a61b07f5ace867f9c1ac38a5aa4d9
[INFO] running `Command { std: "docker" "start" "-a" "5a55c247fe1ced8ec50177fd2662a3c9388a61b07f5ace867f9c1ac38a5aa4d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a55c247fe1ced8ec50177fd2662a3c9388a61b07f5ace867f9c1ac38a5aa4d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a55c247fe1ced8ec50177fd2662a3c9388a61b07f5ace867f9c1ac38a5aa4d9", kill_on_drop: false }`
[INFO] [stdout] 5a55c247fe1ced8ec50177fd2662a3c9388a61b07f5ace867f9c1ac38a5aa4d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] a292875535c698a96fd164450e68902e624ba4087871ba3466f199060bb01589
[INFO] running `Command { std: "docker" "start" "-a" "a292875535c698a96fd164450e68902e624ba4087871ba3466f199060bb01589", kill_on_drop: false }`
[INFO] [stderr]     Checking hyperloglog v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `merge` is never used
[INFO] [stdout]    --> src/hll.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout]  36 | impl HyperLogLog {
[INFO] [stdout]     | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 125 |     pub fn merge(mut self, other: HyperLogLog) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout]     |
[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<String, Infallible>
[INFO] [stdout]  --> src/main.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |       let s = std::fs::read_to_string("./shakespeare.txt")
[INFO] [stdout]   |  _____________^
[INFO] [stdout] 7 | |         .expect("load file")
[INFO] [stdout] 8 | |         .parse::<String>()
[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 `hyperloglog` (bin "hyperloglog") due to 1 previous error; 1 warning emitted
[INFO] [stdout] warning: method `merge` is never used
[INFO] [stdout]    --> src/hll.rs:125:12
[INFO] [stdout]     |
[INFO] [stdout]  36 | impl HyperLogLog {
[INFO] [stdout]     | ---------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 125 |     pub fn merge(mut self, other: HyperLogLog) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]  --> src/main.rs:6:13
[INFO] [stdout]   |
[INFO] [stdout] 6 |       let s = std::fs::read_to_string("./shakespeare.txt")
[INFO] [stdout]   |  _____________^
[INFO] [stdout] 7 | |         .expect("load file")
[INFO] [stdout] 8 | |         .parse::<String>()
[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 `hyperloglog` (bin "hyperloglog" test) due to 1 previous error; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "a292875535c698a96fd164450e68902e624ba4087871ba3466f199060bb01589", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a292875535c698a96fd164450e68902e624ba4087871ba3466f199060bb01589", kill_on_drop: false }`
[INFO] [stdout] a292875535c698a96fd164450e68902e624ba4087871ba3466f199060bb01589