[INFO] fetching crate basic_tree 0.2.5...
[INFO] checking basic_tree-0.2.5 against master#836c31742687ba4e2f857b5b698e1e9e6b67619c for pr-81789
[INFO] extracting crate basic_tree 0.2.5 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate basic_tree 0.2.5 on toolchain 836c31742687ba4e2f857b5b698e1e9e6b67619c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate basic_tree 0.2.5
[INFO] finished tweaking crates.io crate basic_tree 0.2.5
[INFO] tweaked toml for crates.io crate basic_tree 0.2.5 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8527648de1dbc1d0a5934329d19a1614a736c94cd768ad515c03588a3747f74f
[INFO] running `Command { std: "docker" "start" "-a" "8527648de1dbc1d0a5934329d19a1614a736c94cd768ad515c03588a3747f74f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8527648de1dbc1d0a5934329d19a1614a736c94cd768ad515c03588a3747f74f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8527648de1dbc1d0a5934329d19a1614a736c94cd768ad515c03588a3747f74f", kill_on_drop: false }`
[INFO] [stdout] 8527648de1dbc1d0a5934329d19a1614a736c94cd768ad515c03588a3747f74f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2433d3d2e919c28afdde88e01febb07e137d1c4988db0a7228d389699c594328
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2433d3d2e919c28afdde88e01febb07e137d1c4988db0a7228d389699c594328", kill_on_drop: false }`
[INFO] [stderr]     Checking basic_tree v0.2.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::cmp::Eq`
[INFO] [stdout]  --> src/trie/word.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::Eq;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]  --> src/trie/word.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::Eq`
[INFO] [stdout]  --> src/trie/word.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::cmp::Eq;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::hash::Hash`
[INFO] [stdout]  --> src/trie/word.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::hash::Hash;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/trie/word.rs:29:8
[INFO] [stdout]    |
[INFO] [stdout] 29 |     fn new() -> WordTrie {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert_words`
[INFO] [stdout]   --> src/trie/word.rs:33:8
[INFO] [stdout]    |
[INFO] [stdout] 33 |     fn insert_words(&self, words: &str, target: &str) {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split_words`
[INFO] [stdout]   --> src/trie/word.rs:39:8
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn split_words(words: &str) -> Vec<String> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `insert`
[INFO] [stdout]   --> src/trie/word.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn insert(&self, words: &[String], target: String) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_leaf`
[INFO] [stdout]   --> src/trie/word.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn get_leaf(&self, words: &[String]) -> Leaf<String> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_leaf`
[INFO] [stdout]   --> src/trie/word.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 |     fn get_leaf(&self, words: &[String]) -> Leaf<String> {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `Command { std: "docker" "inspect" "2433d3d2e919c28afdde88e01febb07e137d1c4988db0a7228d389699c594328", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2433d3d2e919c28afdde88e01febb07e137d1c4988db0a7228d389699c594328", kill_on_drop: false }`
[INFO] [stdout] 2433d3d2e919c28afdde88e01febb07e137d1c4988db0a7228d389699c594328