[INFO] fetching crate ddgg 0.10.1...
[INFO] checking ddgg-0.10.1 against master#8a703520e80d87d4423c01f9d4fbc9e5f6533a02 for pr-154205-1
[INFO] extracting crate ddgg 0.10.1 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate ddgg 0.10.1
[INFO] finished tweaking crates.io crate ddgg 0.10.1
[INFO] tweaked toml for crates.io crate ddgg 0.10.1 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ddgg 0.10.1 on toolchain 8a703520e80d87d4423c01f9d4fbc9e5f6533a02
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 16 packages to latest compatible versions
[INFO] [stderr]       Adding snafu v0.7.5 (available: v0.9.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded snafu-derive v0.7.5
[INFO] [stderr]   Downloaded snafu v0.7.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 20bdc1b39fbaf60fa92a6f05d2978c9ff58fb9f511cc84c9e663775ecb1f0634
[INFO] running `Command { std: "docker" "start" "-a" "20bdc1b39fbaf60fa92a6f05d2978c9ff58fb9f511cc84c9e663775ecb1f0634", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "20bdc1b39fbaf60fa92a6f05d2978c9ff58fb9f511cc84c9e663775ecb1f0634", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "20bdc1b39fbaf60fa92a6f05d2978c9ff58fb9f511cc84c9e663775ecb1f0634", kill_on_drop: false }`
[INFO] [stdout] 20bdc1b39fbaf60fa92a6f05d2978c9ff58fb9f511cc84c9e663775ecb1f0634
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+8a703520e80d87d4423c01f9d4fbc9e5f6533a02" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 460b8351323e35d5a044e6e3948b3215a516ed0fe52f71613d005f8ec5ce269a
[INFO] running `Command { std: "docker" "start" "-a" "460b8351323e35d5a044e6e3948b3215a516ed0fe52f71613d005f8ec5ce269a", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling doc-comment v0.3.4
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling serde v1.0.228
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]     Checking serde_json v1.0.149
[INFO] [stderr]    Compiling snafu-derive v0.7.5
[INFO] [stderr]     Checking snafu v0.7.5
[INFO] [stderr]     Checking ddgg v0.10.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `vec_ref` is never used
[INFO] [stdout]    --> src/gen_vec.rs:299:19
[INFO] [stdout]     |
[INFO] [stdout] 127 | impl<T> GenVec<T> {
[INFO] [stdout]     | ----------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 299 |     pub(crate) fn vec_ref(&self) -> &Vec<Element<T>> {
[INFO] [stdout]     |                   ^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `vec_ref` is never used
[INFO] [stdout]    --> src/gen_vec.rs:299:19
[INFO] [stdout]     |
[INFO] [stdout] 127 | impl<T> GenVec<T> {
[INFO] [stdout]     | ----------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 299 |     pub(crate) fn vec_ref(&self) -> &Vec<Element<T>> {
[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 10.78s
[INFO] running `Command { std: "docker" "inspect" "460b8351323e35d5a044e6e3948b3215a516ed0fe52f71613d005f8ec5ce269a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "460b8351323e35d5a044e6e3948b3215a516ed0fe52f71613d005f8ec5ce269a", kill_on_drop: false }`
[INFO] [stdout] 460b8351323e35d5a044e6e3948b3215a516ed0fe52f71613d005f8ec5ce269a