[INFO] fetching crate welford 0.1.0...
[INFO] building welford-0.1.0 against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] extracting crate welford 0.1.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate welford 0.1.0
[INFO] finished tweaking crates.io crate welford 0.1.0
[INFO] tweaked toml for crates.io crate welford 0.1.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate welford 0.1.0 on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate welford 0.1.0 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" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 36c49dd731d60a7fc9237ad8f8c2aebd694d83f9bb5f797261ad5ae16736379f
[INFO] running `Command { std: "docker" "start" "-a" "36c49dd731d60a7fc9237ad8f8c2aebd694d83f9bb5f797261ad5ae16736379f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "36c49dd731d60a7fc9237ad8f8c2aebd694d83f9bb5f797261ad5ae16736379f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36c49dd731d60a7fc9237ad8f8c2aebd694d83f9bb5f797261ad5ae16736379f", kill_on_drop: false }`
[INFO] [stdout] 36c49dd731d60a7fc9237ad8f8c2aebd694d83f9bb5f797261ad5ae16736379f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1973942a06190f9afecae2b3f265bdcc49e49091737be03d90aa39b239ad2f0d
[INFO] running `Command { std: "docker" "start" "-a" "1973942a06190f9afecae2b3f265bdcc49e49091737be03d90aa39b239ad2f0d", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling welford v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `merge` is never used
[INFO] [stdout]    --> src/lib.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout]  61 | / impl<T, W> Welford<T, W>
[INFO] [stdout]  62 | | where
[INFO] [stdout]  63 | |     T: Copy + Num + NumAssign + NumCast,
[INFO] [stdout]  64 | |     W: Copy + Num + NumAssign + NumCast + PartialOrd,
[INFO] [stdout]     | |_____________________________________________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |       fn merge(&mut self, other: Self) {
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.75s
[INFO] running `Command { std: "docker" "inspect" "1973942a06190f9afecae2b3f265bdcc49e49091737be03d90aa39b239ad2f0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1973942a06190f9afecae2b3f265bdcc49e49091737be03d90aa39b239ad2f0d", kill_on_drop: false }`
[INFO] [stdout] 1973942a06190f9afecae2b3f265bdcc49e49091737be03d90aa39b239ad2f0d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dd418a6dbf284a65ac5bdbda2bccd58f947d69a7d4bfb4748b289a62667b2d3a
[INFO] running `Command { std: "docker" "start" "-a" "dd418a6dbf284a65ac5bdbda2bccd58f947d69a7d4bfb4748b289a62667b2d3a", kill_on_drop: false }`
[INFO] [stderr]    Compiling welford v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `merge` is never used
[INFO] [stdout]    --> src/lib.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout]  61 | / impl<T, W> Welford<T, W>
[INFO] [stdout]  62 | | where
[INFO] [stdout]  63 | |     T: Copy + Num + NumAssign + NumCast,
[INFO] [stdout]  64 | |     W: Copy + Num + NumAssign + NumCast + PartialOrd,
[INFO] [stdout]     | |_____________________________________________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 100 |       fn merge(&mut self, other: Self) {
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.49s
[INFO] running `Command { std: "docker" "inspect" "dd418a6dbf284a65ac5bdbda2bccd58f947d69a7d4bfb4748b289a62667b2d3a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd418a6dbf284a65ac5bdbda2bccd58f947d69a7d4bfb4748b289a62667b2d3a", kill_on_drop: false }`
[INFO] [stdout] dd418a6dbf284a65ac5bdbda2bccd58f947d69a7d4bfb4748b289a62667b2d3a