[INFO] cloning repository https://github.com/noamtashma/generic-trees
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/noamtashma/generic-trees" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnoamtashma%2Fgeneric-trees", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnoamtashma%2Fgeneric-trees'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7b5eaf917b657a5fcde10ea50d5b0e567033d7f9
[INFO] testing noamtashma/generic-trees against beta-2021-01-01 for beta-1.50-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnoamtashma%2Fgeneric-trees" "/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/noamtashma/generic-trees on toolchain beta-2021-01-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/noamtashma/generic-trees
[INFO] finished tweaking git repo https://github.com/noamtashma/generic-trees
[INFO] tweaked toml for git repo https://github.com/noamtashma/generic-trees written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/noamtashma/generic-trees already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-01-01" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded derive_destructure v1.0.0
[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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b5130373c25cbe4d902e37843a6f9bb44d89280aa9c9fd1ad1621cef17e68eb9
[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" "b5130373c25cbe4d902e37843a6f9bb44d89280aa9c9fd1ad1621cef17e68eb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5130373c25cbe4d902e37843a6f9bb44d89280aa9c9fd1ad1621cef17e68eb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5130373c25cbe4d902e37843a6f9bb44d89280aa9c9fd1ad1621cef17e68eb9", kill_on_drop: false }`
[INFO] [stdout] b5130373c25cbe4d902e37843a6f9bb44d89280aa9c9fd1ad1621cef17e68eb9
[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=warn" "-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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3f9c12f65c27a83496d60fc085226cc97c4c142effe3d1d236ec55cf957d8865
[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" "3f9c12f65c27a83496d60fc085226cc97c4c142effe3d1d236ec55cf957d8865", kill_on_drop: false }`
[INFO] [stderr]    Compiling derive_destructure v1.0.0
[INFO] [stderr]    Compiling trees v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/example.rs:24:30
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/example.rs:28:30
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Increasing`
[INFO] [stdout]   --> src/example.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Increasing(usize , usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Decreasing`
[INFO] [stdout]   --> src/example.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Decreasing(usize, usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `sum_with_index`
[INFO] [stdout]   --> src/example.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split_at_index`
[INFO] [stdout]   --> src/example.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/example.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn new(i : Interval) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search_split`
[INFO] [stdout]   --> src/example.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 |     fn search_split<'a>(&'a mut self, mut index : usize) -> SplayWalker<'a, RAData> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/example.rs:92:17
[INFO] [stdout]    |
[INFO] [stdout] 92 |                 walker.go_left();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/example.rs:95:17
[INFO] [stdout]    |
[INFO] [stdout] 95 |                 walker.go_right();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/example.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |         walker.go_right(); // TODO - use the results
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/example.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         walker.insert_new(RAData::new(i2));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.42s
[INFO] running `Command { std: "docker" "inspect" "3f9c12f65c27a83496d60fc085226cc97c4c142effe3d1d236ec55cf957d8865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f9c12f65c27a83496d60fc085226cc97c4c142effe3d1d236ec55cf957d8865", kill_on_drop: false }`
[INFO] [stdout] 3f9c12f65c27a83496d60fc085226cc97c4c142effe3d1d236ec55cf957d8865
[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=warn" "-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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1427d045ee91ead8cf484301537b9b7712d9ad959543a679dca6d432ccb3fd7d
[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" "1427d045ee91ead8cf484301537b9b7712d9ad959543a679dca6d432ccb3fd7d", kill_on_drop: false }`
[INFO] [stderr]    Compiling trees v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/example.rs:24:30
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/example.rs:28:30
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Increasing`
[INFO] [stdout]   --> src/example.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Increasing(usize , usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Decreasing`
[INFO] [stdout]   --> src/example.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Decreasing(usize, usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `sum_with_index`
[INFO] [stdout]   --> src/example.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split_at_index`
[INFO] [stdout]   --> src/example.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/example.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn new(i : Interval) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search_split`
[INFO] [stdout]   --> src/example.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 |     fn search_split<'a>(&'a mut self, mut index : usize) -> SplayWalker<'a, RAData> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/example.rs:92:17
[INFO] [stdout]    |
[INFO] [stdout] 92 |                 walker.go_left();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/example.rs:95:17
[INFO] [stdout]    |
[INFO] [stdout] 95 |                 walker.go_right();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/example.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |         walker.go_right(); // TODO - use the results
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/example.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         walker.insert_new(RAData::new(i2));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/example.rs:24:30
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `index`
[INFO] [stdout]   --> src/example.rs:28:30
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stdout]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Increasing`
[INFO] [stdout]   --> src/example.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     Increasing(usize , usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Decreasing`
[INFO] [stdout]   --> src/example.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Decreasing(usize, usize),
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `sum_with_index`
[INFO] [stdout]   --> src/example.rs:24:8
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split_at_index`
[INFO] [stdout]   --> src/example.rs:28:8
[INFO] [stdout]    |
[INFO] [stdout] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/example.rs:40:8
[INFO] [stdout]    |
[INFO] [stdout] 40 |     fn new(i : Interval) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `search_split`
[INFO] [stdout]   --> src/example.rs:81:8
[INFO] [stdout]    |
[INFO] [stdout] 81 |     fn search_split<'a>(&'a mut self, mut index : usize) -> SplayWalker<'a, RAData> {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/example.rs:92:17
[INFO] [stdout]    |
[INFO] [stdout] 92 |                 walker.go_left();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]   --> src/example.rs:95:17
[INFO] [stdout]    |
[INFO] [stdout] 95 |                 walker.go_right();
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/example.rs:106:9
[INFO] [stdout]     |
[INFO] [stdout] 106 |         walker.go_right(); // TODO - use the results
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `std::result::Result` that must be used
[INFO] [stdout]    --> src/example.rs:110:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |         walker.insert_new(RAData::new(i2));
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.42s
[INFO] running `Command { std: "docker" "inspect" "1427d045ee91ead8cf484301537b9b7712d9ad959543a679dca6d432ccb3fd7d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1427d045ee91ead8cf484301537b9b7712d9ad959543a679dca6d432ccb3fd7d", kill_on_drop: false }`
[INFO] [stdout] 1427d045ee91ead8cf484301537b9b7712d9ad959543a679dca6d432ccb3fd7d
[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=warn" "-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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-01-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2f2ae8e48e913ac95885563415840c7d946e60cf5c81cad4c90fcf1610ffb94b
[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" "2f2ae8e48e913ac95885563415840c7d946e60cf5c81cad4c90fcf1610ffb94b", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/example.rs:24:30
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stderr]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/example.rs:28:30
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stderr]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Increasing`
[INFO] [stderr]   --> src/example.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     Increasing(usize , usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Decreasing`
[INFO] [stderr]   --> src/example.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Decreasing(usize, usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `sum_with_index`
[INFO] [stderr]   --> src/example.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `split_at_index`
[INFO] [stderr]   --> src/example.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/example.rs:40:8
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn new(i : Interval) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `search_split`
[INFO] [stderr]   --> src/example.rs:81:8
[INFO] [stderr]    |
[INFO] [stderr] 81 |     fn search_split<'a>(&'a mut self, mut index : usize) -> SplayWalker<'a, RAData> {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/example.rs:92:17
[INFO] [stderr]    |
[INFO] [stderr] 92 |                 walker.go_left();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/example.rs:95:17
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 walker.go_right();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/example.rs:106:9
[INFO] [stderr]     |
[INFO] [stderr] 106 |         walker.go_right(); // TODO - use the results
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/example.rs:110:9
[INFO] [stderr]     |
[INFO] [stderr] 110 |         walker.insert_new(RAData::new(i2));
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stdout] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stdout] running 0 tests
[INFO] [stderr]   --> src/example.rs:24:30
[INFO] [stdout] 
[INFO] [stderr]    |
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stderr] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stdout] 
[INFO] [stderr]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `index`
[INFO] [stderr]   --> src/example.rs:28:30
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stderr]    |                              ^^^^^ help: if this is intentional, prefix it with an underscore: `_index`
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Increasing`
[INFO] [stderr]   --> src/example.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     Increasing(usize , usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Decreasing`
[INFO] [stderr]   --> src/example.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Decreasing(usize, usize),
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `sum_with_index`
[INFO] [stderr]   --> src/example.rs:24:8
[INFO] [stderr]    |
[INFO] [stderr] 24 |     fn sum_with_index(&self, index : usize) -> usize {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `split_at_index`
[INFO] [stderr]   --> src/example.rs:28:8
[INFO] [stderr]    |
[INFO] [stderr] 28 |     fn split_at_index(&self, index : usize) -> (Interval, Interval) {
[INFO] [stderr]    |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/example.rs:40:8
[INFO] [stderr]    |
[INFO] [stderr] 40 |     fn new(i : Interval) -> Self {
[INFO] [stderr]    |        ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `search_split`
[INFO] [stderr]   --> src/example.rs:81:8
[INFO] [stderr]    |
[INFO] [stderr] 81 |     fn search_split<'a>(&'a mut self, mut index : usize) -> SplayWalker<'a, RAData> {
[INFO] [stderr]    |        ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/example.rs:92:17
[INFO] [stderr]    |
[INFO] [stderr] 92 |                 walker.go_left();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/example.rs:95:17
[INFO] [stderr]    |
[INFO] [stderr] 95 |                 walker.go_right();
[INFO] [stderr]    |                 ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/example.rs:106:9
[INFO] [stderr]     |
[INFO] [stderr] 106 |         walker.go_right(); // TODO - use the results
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/example.rs:110:9
[INFO] [stderr]     |
[INFO] [stderr] 110 |         walker.insert_new(RAData::new(i2));
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: 12 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/trees-808266c75c2edf30
[INFO] [stderr]    Doc-tests trees
[INFO] [stderr] error[E0659]: `trees` is ambiguous (name vs any other name during import resolution)
[INFO] [stderr]   --> /opt/rustwide/workdir/src/lib.rs:11:9
[INFO] [stderr]    |
[INFO] [stderr] 11 | pub use trees::*;
[INFO] [stderr]    |         ^^^^^ ambiguous name
[INFO] [stderr]    |
[INFO] [stderr]    = note: `trees` could refer to a crate passed with `--extern`
[INFO] [stderr]    = help: use `::trees` to refer to this crate unambiguously
[INFO] [stderr] note: `trees` could also refer to the module defined here
[INFO] [stderr]   --> /opt/rustwide/workdir/src/lib.rs:5:1
[INFO] [stderr]    |
[INFO] [stderr] 5  | pub mod trees;
[INFO] [stderr]    | ^^^^^^^^^^^^^^
[INFO] [stderr]    = help: use `crate::trees` to refer to this module unambiguously
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0659`.
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "2f2ae8e48e913ac95885563415840c7d946e60cf5c81cad4c90fcf1610ffb94b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f2ae8e48e913ac95885563415840c7d946e60cf5c81cad4c90fcf1610ffb94b", kill_on_drop: false }`
[INFO] [stdout] 2f2ae8e48e913ac95885563415840c7d946e60cf5c81cad4c90fcf1610ffb94b