[INFO] cloning repository https://github.com/ricardo0129/fs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ricardo0129/fs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fricardo0129%2Ffs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fricardo0129%2Ffs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bde9bf8cdb4a81d44487953e3ce078d9286d9549
[INFO] checking ricardo0129/fs against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fricardo0129%2Ffs" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ricardo0129/fs on toolchain 1f12b9b0fdbe735968ac002792a720f0ba4faca6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ricardo0129/fs
[INFO] finished tweaking git repo https://github.com/ricardo0129/fs
[INFO] tweaked toml for git repo https://github.com/ricardo0129/fs written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ricardo0129/fs 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" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking ricardo0129/fs against try#f9935d29d867449445ee008640ccca1bf1ae0889+rustflags=-Dtail_expr_drop_order for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fricardo0129%2Ffs" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ricardo0129/fs on toolchain f9935d29d867449445ee008640ccca1bf1ae0889
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ricardo0129/fs
[INFO] finished tweaking git repo https://github.com/ricardo0129/fs
[INFO] tweaked toml for git repo https://github.com/ricardo0129/fs written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ricardo0129/fs 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" "+f9935d29d867449445ee008640ccca1bf1ae0889" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2d6ccec9a1634486b28a1a22751f27ad5fa41e654e0a9b551089ea313a4e00a2
[INFO] running `Command { std: "docker" "start" "-a" "2d6ccec9a1634486b28a1a22751f27ad5fa41e654e0a9b551089ea313a4e00a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d6ccec9a1634486b28a1a22751f27ad5fa41e654e0a9b551089ea313a4e00a2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d6ccec9a1634486b28a1a22751f27ad5fa41e654e0a9b551089ea313a4e00a2", kill_on_drop: false }`
[INFO] [stdout] 2d6ccec9a1634486b28a1a22751f27ad5fa41e654e0a9b551089ea313a4e00a2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dtail_expr_drop_order" "-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f9935d29d867449445ee008640ccca1bf1ae0889" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84edd284489ae70d79ab570d33116587ce2bcdfa011c862a8de59b2a926be67f
[INFO] running `Command { std: "docker" "start" "-a" "84edd284489ae70d79ab570d33116587ce2bcdfa011c862a8de59b2a926be67f", kill_on_drop: false }`
[INFO] [stderr]     Checking fs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/string_ds.rs:12:24
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn contains(&self, word: &String) -> bool {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `word`
[INFO] [stdout]   --> src/string_ds.rs:12:24
[INFO] [stdout]    |
[INFO] [stdout] 12 |     fn contains(&self, word: &String) -> bool {
[INFO] [stdout]    |                        ^^^^ help: if this is intentional, prefix it with an underscore: `_word`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `root`
[INFO] [stdout]   --> src/tree.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let root = self;
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_root`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> src/tree.rs:20:26
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn insert(&mut self, p: Page) {
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `root`
[INFO] [stdout]   --> src/tree.rs:21:13
[INFO] [stdout]    |
[INFO] [stdout] 21 |         let root = self;
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_root`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `p`
[INFO] [stdout]   --> src/tree.rs:20:26
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn insert(&mut self, p: Page) {
[INFO] [stdout]    |                          ^ help: if this is intentional, prefix it with an underscore: `_p`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_page` is never used
[INFO] [stdout]   --> src/main.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn add_page() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `menu` is never used
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn menu() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add_page` is never used
[INFO] [stdout]   --> src/main.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn add_page() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `menu` is never used
[INFO] [stdout]   --> src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn menu() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file_name` is never read
[INFO] [stdout]   --> src/page.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct Page {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 19 |     file_name: String,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wordlist` is never constructed
[INFO] [stdout]  --> src/string_ds.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Wordlist {}
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `file_name` is never read
[INFO] [stdout]   --> src/page.rs:19:5
[INFO] [stdout]    |
[INFO] [stdout] 18 | pub struct Page {
[INFO] [stdout]    |            ---- field in this struct
[INFO] [stdout] 19 |     file_name: String,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Wordlist` is never constructed
[INFO] [stdout]  --> src/string_ds.rs:1:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | struct Wordlist {}
[INFO] [stdout]   |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add`, `contains`, and `remove` are never used
[INFO] [stdout]   --> src/string_ds.rs:4:8
[INFO] [stdout]    |
[INFO] [stdout] 3  | impl Wordlist {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 4  |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 8  |     fn add(&self) -> bool {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn contains(&self, word: &String) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn remove(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/tree.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `insert` are never used
[INFO] [stdout]   --> src/tree.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Node {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 13 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn insert(&mut self, p: Page) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new`, `add`, `contains`, and `remove` are never used
[INFO] [stdout]   --> src/string_ds.rs:4:8
[INFO] [stdout]    |
[INFO] [stdout] 3  | impl Wordlist {
[INFO] [stdout]    | ------------- associated items in this implementation
[INFO] [stdout] 4  |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 8  |     fn add(&self) -> bool {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 12 |     fn contains(&self, word: &String) -> bool {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 16 |     fn remove(&self) -> bool {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tree` is never constructed
[INFO] [stdout]   --> src/tree.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct Tree {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Node` is never constructed
[INFO] [stdout]  --> src/tree.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct Node {
[INFO] [stdout]   |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `insert` are never used
[INFO] [stdout]   --> src/tree.rs:13:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | impl Node {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 13 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 20 |     fn insert(&mut self, p: Page) {
[INFO] [stdout]    |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `attr_index` are never used
[INFO] [stdout]   --> src/tree.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Tree {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 30 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     fn attr_index(&mut self, attr: &String) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Tree` is never constructed
[INFO] [stdout]   --> src/tree.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 25 | struct Tree {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `new` and `attr_index` are never used
[INFO] [stdout]   --> src/tree.rs:30:8
[INFO] [stdout]    |
[INFO] [stdout] 29 | impl Tree {
[INFO] [stdout]    | --------- associated items in this implementation
[INFO] [stdout] 30 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] ...
[INFO] [stdout] 36 |     fn attr_index(&mut self, attr: &String) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] running `Command { std: "docker" "inspect" "84edd284489ae70d79ab570d33116587ce2bcdfa011c862a8de59b2a926be67f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84edd284489ae70d79ab570d33116587ce2bcdfa011c862a8de59b2a926be67f", kill_on_drop: false }`
[INFO] [stdout] 84edd284489ae70d79ab570d33116587ce2bcdfa011c862a8de59b2a926be67f