[INFO] cloning repository https://github.com/jeremy-blackburn/safe-binary-search-tree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jeremy-blackburn/safe-binary-search-tree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeremy-blackburn%2Fsafe-binary-search-tree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeremy-blackburn%2Fsafe-binary-search-tree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] deb54b6c39a7070cf16bea2745bbe547ffe3bad5
[INFO] checking jeremy-blackburn/safe-binary-search-tree against try#f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2 for pr-156992
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeremy-blackburn%2Fsafe-binary-search-tree" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jeremy-blackburn/safe-binary-search-tree
[INFO] finished tweaking git repo https://github.com/jeremy-blackburn/safe-binary-search-tree
[INFO] tweaked toml for git repo https://github.com/jeremy-blackburn/safe-binary-search-tree written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jeremy-blackburn/safe-binary-search-tree on toolchain f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jeremy-blackburn/safe-binary-search-tree 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" "+f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] checking jeremy-blackburn/safe-binary-search-tree against try#f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2 for pr-156992
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeremy-blackburn%2Fsafe-binary-search-tree" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jeremy-blackburn/safe-binary-search-tree
[INFO] finished tweaking git repo https://github.com/jeremy-blackburn/safe-binary-search-tree
[INFO] tweaked toml for git repo https://github.com/jeremy-blackburn/safe-binary-search-tree written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jeremy-blackburn/safe-binary-search-tree on toolchain f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jeremy-blackburn/safe-binary-search-tree 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" "+f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7a98878ee367e3b6fd4cef1318537ce711a1bb9ee2ee91e4e5e47074b06bf987
[INFO] running `Command { std: "docker" "start" "-a" "7a98878ee367e3b6fd4cef1318537ce711a1bb9ee2ee91e4e5e47074b06bf987", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a98878ee367e3b6fd4cef1318537ce711a1bb9ee2ee91e4e5e47074b06bf987", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a98878ee367e3b6fd4cef1318537ce711a1bb9ee2ee91e4e5e47074b06bf987", kill_on_drop: false }`
[INFO] [stdout] 7a98878ee367e3b6fd4cef1318537ce711a1bb9ee2ee91e4e5e47074b06bf987
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+f16624c7fb52ccf15cd304a9728caf1ef4b9c0d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac1b43cee8f3a215d73ecf552adc7cfa8828570c8a8f3701c0655e80d0e486db
[INFO] running `Command { std: "docker" "start" "-a" "ac1b43cee8f3a215d73ecf552adc7cfa8828570c8a8f3701c0655e80d0e486db", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.94
[INFO] [stderr]     Checking regex-syntax v0.6.29
[INFO] [stderr]     Checking regex-syntax v0.8.5
[INFO] [stderr]     Checking overload v0.1.1
[INFO] [stderr]     Checking smallvec v1.15.0
[INFO] [stderr]     Checking tracing-core v0.1.33
[INFO] [stderr]     Checking thread_local v1.1.8
[INFO] [stderr]     Checking nu-ansi-term v0.46.0
[INFO] [stderr]     Checking tracing-log v0.2.0
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.100
[INFO] [stderr]     Checking regex-automata v0.4.9
[INFO] [stderr]     Checking regex-automata v0.1.10
[INFO] [stderr]     Checking matchers v0.1.0
[INFO] [stderr]     Checking regex v1.11.1
[INFO] [stderr]    Compiling tracing-attributes v0.1.28
[INFO] [stderr]     Checking tracing v0.1.41
[INFO] [stderr]     Checking tracing-subscriber v0.3.19
[INFO] [stderr]     Checking safe-binary-search-tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `borrow::Borrow`
[INFO] [stdout]  --> src/alternate.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{borrow::Borrow, fmt::Display};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `borrow::Borrow`
[INFO] [stdout]  --> src/alternate.rs:1:11
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::{borrow::Borrow, fmt::Display};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right_node`
[INFO] [stdout]    --> src/lib.rs:165:36
[INFO] [stdout]     |
[INFO] [stdout] 165 |                     (Some(_), Some(right_node)) => {
[INFO] [stdout]     |                                    ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_right_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right_node`
[INFO] [stdout]    --> src/lib.rs:226:36
[INFO] [stdout]     |
[INFO] [stdout] 226 |                     (Some(_), Some(right_node)) => {
[INFO] [stdout]     |                                    ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_right_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `delete_internal` is never used
[INFO] [stdout]    --> src/lib.rs:120:4
[INFO] [stdout]     |
[INFO] [stdout] 120 | fn delete_internal<T: Ord + Default>(root: &mut Node<T>, val: 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: type alias `BoxedNode` is never used
[INFO] [stdout]  --> src/alternate.rs:3:6
[INFO] [stdout]   |
[INFO] [stdout] 3 | type BoxedNode<T> = Box<Node<T>>;
[INFO] [stdout]   |      ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/alternate.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Node<T: Ord + Display> {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BinarySearchTree` is never constructed
[INFO] [stdout]   --> src/alternate.rs:51:12
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct BinarySearchTree<T: Ord + Default + Display> {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `exists`, `insert`, `delete`, `pretty_print`, and `height` are never used
[INFO] [stdout]    --> src/alternate.rs:82:12
[INFO] [stdout]     |
[INFO] [stdout]  81 | impl<T: Ord + Default + Display> BinarySearchTree<T> {
[INFO] [stdout]     | ---------------------------------------------------- methods in this implementation
[INFO] [stdout]  82 |     pub fn exists(&self, val: T) -> bool {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  90 |     pub fn insert(&mut self, val: T) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 101 |     pub fn delete(&mut self, val: T) {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 133 |     pub fn pretty_print(&self) {
[INFO] [stdout]     |            ^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 152 |     pub fn height(&self) -> usize {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `height_internal` is never used
[INFO] [stdout]    --> src/alternate.rs:161:4
[INFO] [stdout]     |
[INFO] [stdout] 161 | fn height_internal<T: Ord + Display>(root: Option<&Node<T>>) -> usize {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `insert_internal` is never used
[INFO] [stdout]    --> src/alternate.rs:184:4
[INFO] [stdout]     |
[INFO] [stdout] 184 | fn insert_internal<T: Ord + Default + Display>(root: &mut Node<T>, val: T) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `merge` is never used
[INFO] [stdout]    --> src/alternate.rs:216:4
[INFO] [stdout]     |
[INFO] [stdout] 216 | fn merge<T: Ord + Display>(root: &mut Node<T>, to_merge: BoxedNode<T>) {
[INFO] [stdout]     |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `delete_internal` is never used
[INFO] [stdout]    --> src/alternate.rs:239:4
[INFO] [stdout]     |
[INFO] [stdout] 239 | fn delete_internal<T: Ord + Display>(root: &mut Node<T>, val: T) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `exists_internal` is never used
[INFO] [stdout]    --> src/alternate.rs:320:4
[INFO] [stdout]     |
[INFO] [stdout] 320 | fn exists_internal<T: Ord + Display>(root: &Node<T>, val: T) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right_node`
[INFO] [stdout]    --> src/lib.rs:165:36
[INFO] [stdout]     |
[INFO] [stdout] 165 |                     (Some(_), Some(right_node)) => {
[INFO] [stdout]     |                                    ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_right_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `right_node`
[INFO] [stdout]    --> src/lib.rs:226:36
[INFO] [stdout]     |
[INFO] [stdout] 226 |                     (Some(_), Some(right_node)) => {
[INFO] [stdout]     |                                    ^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_right_node`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `delete_internal` is never used
[INFO] [stdout]    --> src/lib.rs:120:4
[INFO] [stdout]     |
[INFO] [stdout] 120 | fn delete_internal<T: Ord + Default>(root: &mut Node<T>, val: 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 `exists` is never used
[INFO] [stdout]   --> src/alternate.rs:82:12
[INFO] [stdout]    |
[INFO] [stdout] 81 | impl<T: Ord + Default + Display> BinarySearchTree<T> {
[INFO] [stdout]    | ---------------------------------------------------- method in this implementation
[INFO] [stdout] 82 |     pub fn exists(&self, val: T) -> bool {
[INFO] [stdout]    |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `exists_internal` is never used
[INFO] [stdout]    --> src/alternate.rs:320:4
[INFO] [stdout]     |
[INFO] [stdout] 320 | fn exists_internal<T: Ord + Display>(root: &Node<T>, val: T) -> bool {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.50s
[INFO] running `Command { std: "docker" "inspect" "ac1b43cee8f3a215d73ecf552adc7cfa8828570c8a8f3701c0655e80d0e486db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac1b43cee8f3a215d73ecf552adc7cfa8828570c8a8f3701c0655e80d0e486db", kill_on_drop: false }`
[INFO] [stdout] ac1b43cee8f3a215d73ecf552adc7cfa8828570c8a8f3701c0655e80d0e486db
