[INFO] cloning repository https://github.com/SpadeA-Tang/skiplist-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/SpadeA-Tang/skiplist-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSpadeA-Tang%2Fskiplist-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSpadeA-Tang%2Fskiplist-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a9d27501ddfc17d6df9afababcaa6280f1af9e77
[INFO] checking SpadeA-Tang/skiplist-rs against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSpadeA-Tang%2Fskiplist-rs" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/SpadeA-Tang/skiplist-rs on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SpadeA-Tang/skiplist-rs
[INFO] finished tweaking git repo https://github.com/SpadeA-Tang/skiplist-rs
[INFO] tweaked toml for git repo https://github.com/SpadeA-Tang/skiplist-rs written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/SpadeA-Tang/skiplist-rs 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" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded fail v0.5.1
[INFO] [stderr]   Downloaded loom v0.7.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d3fbe8c0755e22860d986e963a113102b59db8f73e985ed98cb4b8478f20a661
[INFO] running `Command { std: "docker" "start" "-a" "d3fbe8c0755e22860d986e963a113102b59db8f73e985ed98cb4b8478f20a661", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d3fbe8c0755e22860d986e963a113102b59db8f73e985ed98cb4b8478f20a661", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d3fbe8c0755e22860d986e963a113102b59db8f73e985ed98cb4b8478f20a661", kill_on_drop: false }`
[INFO] [stdout] d3fbe8c0755e22860d986e963a113102b59db8f73e985ed98cb4b8478f20a661
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4ee2293f219a40aa308a3217ed0250a1c3d2c292928a56de70da339fdc1ffc22
[INFO] running `Command { std: "docker" "start" "-a" "4ee2293f219a40aa308a3217ed0250a1c3d2c292928a56de70da339fdc1ffc22", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking regex-syntax v0.8.2
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking overload v0.1.1
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]     Checking tracing-log v0.2.0
[INFO] [stderr]     Checking nu-ansi-term v0.46.0
[INFO] [stderr]     Checking sharded-slab v0.1.7
[INFO] [stderr]     Checking thread_local v1.1.7
[INFO] [stderr]     Checking smallvec v1.13.1
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking getrandom v0.2.11
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking regex-automata v0.4.4
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling tikv-jemalloc-sys v0.5.4+5.3.0-patched
[INFO] [stderr]    Compiling generator v0.7.5
[INFO] [stderr]     Checking fail v0.5.1
[INFO] [stderr]     Checking matchers v0.1.0
[INFO] [stderr]     Checking regex v1.10.3
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking tracing-subscriber v0.3.18
[INFO] [stderr]     Checking loom v0.7.1
[INFO] [stderr]     Checking tikv-jemalloc-ctl v0.5.4
[INFO] [stderr]     Checking tikv-jemallocator v0.5.4
[INFO] [stderr]     Checking skiplist-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `crossbeam_epoch` is imported redundantly
[INFO] [stdout]   --> src/list.rs:16:23
[INFO] [stdout]    |
[INFO] [stdout] 16 | use crossbeam_epoch::{self, default_collector, pin, Collector, Guard, Shared};
[INFO] [stdout]    |                       ^^^^ the item `crossbeam_epoch` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drop_key_value` is never used
[INFO] [stdout]    --> src/list.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub trait ReclaimableNode {
[INFO] [stdout]     |           --------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 124 |     fn drop_key_value(&mut self);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drop_key_value` is never used
[INFO] [stdout]    --> src/list.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub trait ReclaimableNode {
[INFO] [stdout]     |           --------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 124 |     fn drop_key_value(&mut self);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 30s
[INFO] running `Command { std: "docker" "inspect" "4ee2293f219a40aa308a3217ed0250a1c3d2c292928a56de70da339fdc1ffc22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4ee2293f219a40aa308a3217ed0250a1c3d2c292928a56de70da339fdc1ffc22", kill_on_drop: false }`
[INFO] [stdout] 4ee2293f219a40aa308a3217ed0250a1c3d2c292928a56de70da339fdc1ffc22
[INFO] checking SpadeA-Tang/skiplist-rs against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FSpadeA-Tang%2Fskiplist-rs" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/SpadeA-Tang/skiplist-rs on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/SpadeA-Tang/skiplist-rs
[INFO] finished tweaking git repo https://github.com/SpadeA-Tang/skiplist-rs
[INFO] tweaked toml for git repo https://github.com/SpadeA-Tang/skiplist-rs written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/SpadeA-Tang/skiplist-rs 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" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a83dc110f86e9bc797c57695e33f897eed290af50780cf65a1f62300acbcb5ee
[INFO] running `Command { std: "docker" "start" "-a" "a83dc110f86e9bc797c57695e33f897eed290af50780cf65a1f62300acbcb5ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a83dc110f86e9bc797c57695e33f897eed290af50780cf65a1f62300acbcb5ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a83dc110f86e9bc797c57695e33f897eed290af50780cf65a1f62300acbcb5ee", kill_on_drop: false }`
[INFO] [stdout] a83dc110f86e9bc797c57695e33f897eed290af50780cf65a1f62300acbcb5ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6030405dd6dc4becbfe68fafdf239fe4c424837d1587833fc5643921b3d93fae
[INFO] running `Command { std: "docker" "start" "-a" "6030405dd6dc4becbfe68fafdf239fe4c424837d1587833fc5643921b3d93fae", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.151
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking tracing-core v0.1.32
[INFO] [stderr]     Checking regex-syntax v0.8.2
[INFO] [stderr]    Compiling crossbeam-utils v0.8.19
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]    Compiling syn v2.0.48
[INFO] [stderr]     Checking overload v0.1.1
[INFO] [stderr]    Compiling slog v2.7.0
[INFO] [stderr]     Checking sharded-slab v0.1.7
[INFO] [stderr]     Checking tracing-log v0.2.0
[INFO] [stderr]     Checking nu-ansi-term v0.46.0
[INFO] [stderr]     Checking thread_local v1.1.7
[INFO] [stderr]     Checking smallvec v1.13.1
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking getrandom v0.2.11
[INFO] [stderr]    Compiling cc v1.0.83
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking regex-automata v0.4.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]    Compiling tikv-jemalloc-sys v0.5.4+5.3.0-patched
[INFO] [stderr]    Compiling generator v0.7.5
[INFO] [stderr]     Checking fail v0.5.1
[INFO] [stderr]     Checking matchers v0.1.0
[INFO] [stderr]     Checking regex v1.10.3
[INFO] [stderr]    Compiling tracing-attributes v0.1.27
[INFO] [stderr]     Checking tracing v0.1.40
[INFO] [stderr]     Checking tracing-subscriber v0.3.18
[INFO] [stderr]     Checking loom v0.7.1
[INFO] [stderr]     Checking tikv-jemallocator v0.5.4
[INFO] [stderr]     Checking tikv-jemalloc-ctl v0.5.4
[INFO] [stderr]     Checking skiplist-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `crossbeam_epoch` is imported redundantly
[INFO] [stdout]   --> src/list.rs:16:23
[INFO] [stdout]    |
[INFO] [stdout] 16 | use crossbeam_epoch::{self, default_collector, pin, Collector, Guard, Shared};
[INFO] [stdout]    |                       ^^^^ the item `crossbeam_epoch` is already defined by prelude
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drop_key_value` is never used
[INFO] [stdout]    --> src/list.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub trait ReclaimableNode {
[INFO] [stdout]     |           --------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 124 |     fn drop_key_value(&mut self);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `drop_key_value` is never used
[INFO] [stdout]    --> src/list.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 121 | pub trait ReclaimableNode {
[INFO] [stdout]     |           --------------- method in this trait
[INFO] [stdout] ...
[INFO] [stdout] 124 |     fn drop_key_value(&mut self);
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 36s
[INFO] running `Command { std: "docker" "inspect" "6030405dd6dc4becbfe68fafdf239fe4c424837d1587833fc5643921b3d93fae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6030405dd6dc4becbfe68fafdf239fe4c424837d1587833fc5643921b3d93fae", kill_on_drop: false }`
[INFO] [stdout] 6030405dd6dc4becbfe68fafdf239fe4c424837d1587833fc5643921b3d93fae