[INFO] cloning repository https://github.com/raymondboswel/datastructures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/raymondboswel/datastructures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraymondboswel%2Fdatastructures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraymondboswel%2Fdatastructures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7b9cfc937c5d2c5e2d3ddfaa06e2bf6f4807c75b
[INFO] checking raymondboswel/datastructures against master#1f12b9b0fdbe735968ac002792a720f0ba4faca6 for crater-rollup-uwu
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fraymondboswel%2Fdatastructures" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/raymondboswel/datastructures 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/raymondboswel/datastructures
[INFO] finished tweaking git repo https://github.com/raymondboswel/datastructures
[INFO] tweaked toml for git repo https://github.com/raymondboswel/datastructures written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/raymondboswel/datastructures 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 85d82fb177facb69173205c19d02f036f91b798cac01a8cc38ee2877c6cf6070
[INFO] running `Command { std: "docker" "start" "-a" "85d82fb177facb69173205c19d02f036f91b798cac01a8cc38ee2877c6cf6070", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "85d82fb177facb69173205c19d02f036f91b798cac01a8cc38ee2877c6cf6070", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85d82fb177facb69173205c19d02f036f91b798cac01a8cc38ee2877c6cf6070", kill_on_drop: false }`
[INFO] [stdout] 85d82fb177facb69173205c19d02f036f91b798cac01a8cc38ee2877c6cf6070
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+1f12b9b0fdbe735968ac002792a720f0ba4faca6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 36565983c774f685351dcdbafc766bb55b50bdcbaf2fd0653ac9edacdbb0f230
[INFO] running `Command { std: "docker" "start" "-a" "36565983c774f685351dcdbafc766bb55b50bdcbaf2fd0653ac9edacdbb0f230", kill_on_drop: false }`
[INFO] [stderr]     Checking datastructures v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/ch1/ex1.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufRead` and `self`
[INFO] [stdout]  --> src/ch1/ex1.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, BufRead};
[INFO] [stdout]   |               ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::filter_duplicates`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use ch1::ex1::filter_duplicates;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::only_duplicates`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use ch1::ex1::only_duplicates;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::queue_n_till_blank_line`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use ch1::ex1::queue_n_till_blank_line;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::reverse_lines`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use ch1::ex1::reverse_lines;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::reverse_n_lines`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use ch1::ex1::reverse_n_lines;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::fs::File`
[INFO] [stdout]  --> src/ch1/ex1.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::fs::File;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `BufRead` and `self`
[INFO] [stdout]  --> src/ch1/ex1.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::io::{self, BufRead};
[INFO] [stdout]   |               ^^^^  ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::filter_duplicates`
[INFO] [stdout]  --> src/main.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 | use ch1::ex1::filter_duplicates;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::only_duplicates`
[INFO] [stdout]  --> src/main.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 | use ch1::ex1::only_duplicates;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::queue_n_till_blank_line`
[INFO] [stdout]  --> src/main.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use ch1::ex1::queue_n_till_blank_line;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::reverse_lines`
[INFO] [stdout]   --> src/main.rs:10:5
[INFO] [stdout]    |
[INFO] [stdout] 10 | use ch1::ex1::reverse_lines;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `ch1::ex1::reverse_n_lines`
[INFO] [stdout]   --> src/main.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 | use ch1::ex1::reverse_n_lines;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty`
[INFO] [stdout]   --> src/ch1/ex1.rs:68:21
[INFO] [stdout]    |
[INFO] [stdout] 68 |                 let empty = "".to_string();
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_empty`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `empty`
[INFO] [stdout]   --> src/ch1/ex1.rs:68:21
[INFO] [stdout]    |
[INFO] [stdout] 68 |                 let empty = "".to_string();
[INFO] [stdout]    |                     ^^^^^ help: if this is intentional, prefix it with an underscore: `_empty`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/ch1/ex1.rs:55:44
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn queue_n_till_blank_line<P>(path: P, n: u8)
[INFO] [stdout]    |                                            ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `n`
[INFO] [stdout]   --> src/ch1/ex1.rs:55:44
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn queue_n_till_blank_line<P>(path: P, n: u8)
[INFO] [stdout]    |                                            ^ help: if this is intentional, prefix it with an underscore: `_n`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reverse_lines` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn reverse_lines<P>(path: P)
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reverse_n_lines` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn reverse_n_lines<P>(path: P, n: u8)
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reverse_lines` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub fn reverse_lines<P>(path: P)
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `queue_n_till_blank_line` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn queue_n_till_blank_line<P>(path: P, n: u8)
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `filter_duplicates` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 | pub fn filter_duplicates<P>(path: P)
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `reverse_n_lines` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:31:8
[INFO] [stdout]    |
[INFO] [stdout] 31 | pub fn reverse_n_lines<P>(path: P, n: u8)
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `only_duplicates` is never used
[INFO] [stdout]    --> src/ch1/ex1.rs:106:8
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub fn only_duplicates<P>(path: P)
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `queue_n_till_blank_line` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:55:8
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn queue_n_till_blank_line<P>(path: P, n: u8)
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `filter_duplicates` is never used
[INFO] [stdout]   --> src/ch1/ex1.rs:83:8
[INFO] [stdout]    |
[INFO] [stdout] 83 | pub fn filter_duplicates<P>(path: P)
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `only_duplicates` is never used
[INFO] [stdout]    --> src/ch1/ex1.rs:106:8
[INFO] [stdout]     |
[INFO] [stdout] 106 | pub fn only_duplicates<P>(path: P)
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 14 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] running `Command { std: "docker" "inspect" "36565983c774f685351dcdbafc766bb55b50bdcbaf2fd0653ac9edacdbb0f230", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "36565983c774f685351dcdbafc766bb55b50bdcbaf2fd0653ac9edacdbb0f230", kill_on_drop: false }`
[INFO] [stdout] 36565983c774f685351dcdbafc766bb55b50bdcbaf2fd0653ac9edacdbb0f230