[INFO] cloning repository https://github.com/kalkins/rust-intro
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kalkins/rust-intro" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalkins%2Frust-intro", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalkins%2Frust-intro'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9a902d331cda02540d4c10c9044d5c549766808f
[INFO] checking kalkins/rust-intro against master#068609ce766e55d2e7371cd2a86143a6d7e8e2e4 for pr-138952
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkalkins%2Frust-intro" "/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/kalkins/rust-intro on toolchain 068609ce766e55d2e7371cd2a86143a6d7e8e2e4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kalkins/rust-intro
[INFO] finished tweaking git repo https://github.com/kalkins/rust-intro
[INFO] tweaked toml for git repo https://github.com/kalkins/rust-intro written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kalkins/rust-intro 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" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "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-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b6c0de85fcb05d81b749a81bb399b9d42086afb5973b4a3fc4f0acaa939dcdb4
[INFO] running `Command { std: "docker" "start" "-a" "b6c0de85fcb05d81b749a81bb399b9d42086afb5973b4a3fc4f0acaa939dcdb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b6c0de85fcb05d81b749a81bb399b9d42086afb5973b4a3fc4f0acaa939dcdb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b6c0de85fcb05d81b749a81bb399b9d42086afb5973b4a3fc4f0acaa939dcdb4", kill_on_drop: false }`
[INFO] [stdout] b6c0de85fcb05d81b749a81bb399b9d42086afb5973b4a3fc4f0acaa939dcdb4
[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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+068609ce766e55d2e7371cd2a86143a6d7e8e2e4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2879ad88056b6b2873007f903ccf0591847438e349b006ee850f1a0885e9b807
[INFO] running `Command { std: "docker" "start" "-a" "2879ad88056b6b2873007f903ccf0591847438e349b006ee850f1a0885e9b807", kill_on_drop: false }`
[INFO] [stderr]     Checking rust-intro v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `Display` and `Formatter`
[INFO] [stdout]  --> src/task2_complex_numbers.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Display, Formatter};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Add` and `Mul`
[INFO] [stdout]  --> src/task2_complex_numbers.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::{Add, Mul};
[INFO] [stdout]   |                ^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter::Sum`
[INFO] [stdout]  --> src/task3_iterators.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter::Sum;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Rem`
[INFO] [stdout]  --> src/task3_iterators.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::Rem;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]  --> src/task1_basics.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn add(first: i32, second: i32) -> i32 {
[INFO] [stdout]   |        ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `second`
[INFO] [stdout]  --> src/task1_basics.rs:3:20
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn add(first: i32, second: i32) -> i32 {
[INFO] [stdout]   |                    ^^^^^^ help: if this is intentional, prefix it with an underscore: `_second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/task1_basics.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn plusplus(value: i32) -> i32 {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/task3_iterators.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn plus_one(list: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]   --> src/task3_iterators.rs:28:20
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn sum_even_i32<I>(iter: I) -> i32 {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]   --> src/task3_iterators.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn sum_even<I, E>(iter: I) -> E {
[INFO] [stdout]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]   --> src/task3_iterators.rs:67:38
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn longest_increasing_subsequence<I>(iter: I) -> usize {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]  --> src/task1_basics.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn add(first: i32, second: i32) -> i32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plusplus` is never used
[INFO] [stdout]   --> src/task1_basics.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn plusplus(value: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn plus_one(list: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_even_i32` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn sum_even_i32<I>(iter: I) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_even` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn sum_even<I, E>(iter: I) -> E {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_increasing_subsequence` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn longest_increasing_subsequence<I>(iter: I) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::task1_basics::*`
[INFO] [stdout]   --> src/task1_basics.rs:18:9
[INFO] [stdout]    |
[INFO] [stdout] 18 |     use crate::task1_basics::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Display` and `Formatter`
[INFO] [stdout]  --> src/task2_complex_numbers.rs:1:16
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::{Display, Formatter};
[INFO] [stdout]   |                ^^^^^^^  ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Add` and `Mul`
[INFO] [stdout]  --> src/task2_complex_numbers.rs:2:16
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::{Add, Mul};
[INFO] [stdout]   |                ^^^  ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::task2_complex_numbers::*`
[INFO] [stdout]   --> src/task2_complex_numbers.rs:72:9
[INFO] [stdout]    |
[INFO] [stdout] 72 |     use crate::task2_complex_numbers::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter::Sum`
[INFO] [stdout]  --> src/task3_iterators.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::iter::Sum;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::ops::Rem`
[INFO] [stdout]  --> src/task3_iterators.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::ops::Rem;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::task3_iterators::*`
[INFO] [stdout]   --> src/task3_iterators.rs:73:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |     use crate::task3_iterators::*;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `first`
[INFO] [stdout]  --> src/task1_basics.rs:3:8
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn add(first: i32, second: i32) -> i32 {
[INFO] [stdout]   |        ^^^^^ help: if this is intentional, prefix it with an underscore: `_first`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `second`
[INFO] [stdout]  --> src/task1_basics.rs:3:20
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn add(first: i32, second: i32) -> i32 {
[INFO] [stdout]   |                    ^^^^^^ help: if this is intentional, prefix it with an underscore: `_second`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `value`
[INFO] [stdout]   --> src/task1_basics.rs:12:13
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn plusplus(value: i32) -> i32 {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_value`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `list`
[INFO] [stdout]   --> src/task3_iterators.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn plus_one(list: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |             ^^^^ help: if this is intentional, prefix it with an underscore: `_list`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]   --> src/task3_iterators.rs:28:20
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn sum_even_i32<I>(iter: I) -> i32 {
[INFO] [stdout]    |                    ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]   --> src/task3_iterators.rs:40:19
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn sum_even<I, E>(iter: I) -> E {
[INFO] [stdout]    |                   ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `iter`
[INFO] [stdout]   --> src/task3_iterators.rs:67:38
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn longest_increasing_subsequence<I>(iter: I) -> usize {
[INFO] [stdout]    |                                      ^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]  --> src/task1_basics.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn add(first: i32, second: i32) -> i32 {
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plusplus` is never used
[INFO] [stdout]   --> src/task1_basics.rs:12:4
[INFO] [stdout]    |
[INFO] [stdout] 12 | fn plusplus(value: i32) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `plus_one` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn plus_one(list: Vec<i32>) -> Vec<i32> {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_even_i32` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn sum_even_i32<I>(iter: I) -> i32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sum_even` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:40:4
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn sum_even<I, E>(iter: I) -> E {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_increasing_subsequence` is never used
[INFO] [stdout]   --> src/task3_iterators.rs:67:4
[INFO] [stdout]    |
[INFO] [stdout] 67 | fn longest_increasing_subsequence<I>(iter: I) -> usize {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "2879ad88056b6b2873007f903ccf0591847438e349b006ee850f1a0885e9b807", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2879ad88056b6b2873007f903ccf0591847438e349b006ee850f1a0885e9b807", kill_on_drop: false }`
[INFO] [stdout] 2879ad88056b6b2873007f903ccf0591847438e349b006ee850f1a0885e9b807