[INFO] cloning repository https://github.com/sdaigo/collections
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sdaigo/collections" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsdaigo%2Fcollections", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsdaigo%2Fcollections'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c67deb3e26f75f48154cf6cece0886713e363652
[INFO] checking sdaigo/collections against master#5a45ab9738330fb317d49e3594c2db5248b1e971 for pr-136303
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsdaigo%2Fcollections" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sdaigo/collections on toolchain 5a45ab9738330fb317d49e3594c2db5248b1e971
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sdaigo/collections
[INFO] finished tweaking git repo https://github.com/sdaigo/collections
[INFO] tweaked toml for git repo https://github.com/sdaigo/collections written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sdaigo/collections 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" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bbea0acbe05d243f8c72dc2bed3a57a1eeaccc7e5dae90c045024449c674f47f
[INFO] running `Command { std: "docker" "start" "-a" "bbea0acbe05d243f8c72dc2bed3a57a1eeaccc7e5dae90c045024449c674f47f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bbea0acbe05d243f8c72dc2bed3a57a1eeaccc7e5dae90c045024449c674f47f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bbea0acbe05d243f8c72dc2bed3a57a1eeaccc7e5dae90c045024449c674f47f", kill_on_drop: false }`
[INFO] [stdout] bbea0acbe05d243f8c72dc2bed3a57a1eeaccc7e5dae90c045024449c674f47f
[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:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+5a45ab9738330fb317d49e3594c2db5248b1e971" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b4de339bbfdecd14c113f66672c93fdb56a293e8291eb8ed2916da8fdb50a6d
[INFO] running `Command { std: "docker" "start" "-a" "3b4de339bbfdecd14c113f66672c93fdb56a293e8291eb8ed2916da8fdb50a6d", kill_on_drop: false }`
[INFO] [stderr]     Checking collections v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]  --> src/vector_examples.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let v1: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hashmap_example` is never used
[INFO] [stdout]  --> src/hashmap_examples.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn hashmap_example() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vector_example` is never used
[INFO] [stdout]  --> src/vector_examples.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn vector_example() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]  --> src/vector_examples.rs:2:6
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let v1: Vec<i32> = Vec::new();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `hashmap_example` is never used
[INFO] [stdout]  --> src/hashmap_examples.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub fn hashmap_example() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `vector_example` is never used
[INFO] [stdout]  --> src/vector_examples.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub fn vector_example() {
[INFO] [stdout]   |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] running `Command { std: "docker" "inspect" "3b4de339bbfdecd14c113f66672c93fdb56a293e8291eb8ed2916da8fdb50a6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b4de339bbfdecd14c113f66672c93fdb56a293e8291eb8ed2916da8fdb50a6d", kill_on_drop: false }`
[INFO] [stdout] 3b4de339bbfdecd14c113f66672c93fdb56a293e8291eb8ed2916da8fdb50a6d