[INFO] cloning repository https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kazchimo/purely-functional-data-stuructures.rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7259f58fdcce9dc859d18d9a3f24d71bebea301a
[INFO] checking kazchimo/purely-functional-data-stuructures.rs against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkazchimo%2Fpurely-functional-data-stuructures.rs" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] finished tweaking git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs
[INFO] tweaked toml for git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/kazchimo/purely-functional-data-stuructures.rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2676d2824e856317576b2d06c0582e58546959a99c5235871ff8884c3bf71704
[INFO] running `Command { std: "docker" "start" "-a" "2676d2824e856317576b2d06c0582e58546959a99c5235871ff8884c3bf71704", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2676d2824e856317576b2d06c0582e58546959a99c5235871ff8884c3bf71704", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2676d2824e856317576b2d06c0582e58546959a99c5235871ff8884c3bf71704", kill_on_drop: false }`
[INFO] [stdout] 2676d2824e856317576b2d06c0582e58546959a99c5235871ff8884c3bf71704
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] aa0521011b364b5d8794569840b6be37d195039bdd227cae1ca5db37d12d40b6
[INFO] running `Command { std: "docker" "start" "-a" "aa0521011b364b5d8794569840b6be37d195039bdd227cae1ca5db37d12d40b6", kill_on_drop: false }`
[INFO] [stderr]     Checking purely-functional-data-structures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Nil`
[INFO] [stdout]  --> src/list.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Nil,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Cons`
[INFO] [stdout]  --> src/list.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Cons(&'a T, Box<&'a List<'a, T>>),
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `empty`
[INFO] [stdout]   --> src/list.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn empty() -> List<'static, T> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `one`
[INFO] [stdout]   --> src/list.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn one(a: &T) -> List<T> {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `cons`
[INFO] [stdout]   --> src/list.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn cons<'a>(x: &'a T, s: &'a List<T>) -> List<'a, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `is_empty`
[INFO] [stdout]   --> src/list.rs:22:8
[INFO] [stdout]    |
[INFO] [stdout] 22 |     fn is_empty(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `head`
[INFO] [stdout]   --> src/list.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn head(&self) -> &T {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `tail`
[INFO] [stdout]   --> src/list.rs:36:8
[INFO] [stdout]    |
[INFO] [stdout] 36 |     fn tail(&self) -> &List<'_, T> {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.34s
[INFO] running `Command { std: "docker" "inspect" "aa0521011b364b5d8794569840b6be37d195039bdd227cae1ca5db37d12d40b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aa0521011b364b5d8794569840b6be37d195039bdd227cae1ca5db37d12d40b6", kill_on_drop: false }`
[INFO] [stdout] aa0521011b364b5d8794569840b6be37d195039bdd227cae1ca5db37d12d40b6