[INFO] updating cached repository https://github.com/odd-otocyon/learning_rust-
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] af1ae8fec3de199029fa4fc33b998bc0416ac588
[INFO] checking odd-otocyon/learning_rust- against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fodd-otocyon%2Flearning_rust-" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/odd-otocyon/learning_rust- on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/odd-otocyon/learning_rust-
[INFO] finished tweaking git repo https://github.com/odd-otocyon/learning_rust-
[INFO] tweaked toml for git repo https://github.com/odd-otocyon/learning_rust- written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/odd-otocyon/learning_rust- already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] db869690b806fbd35ea448380b85ed48747525c356db1b555f265c161fcb5ea8
[INFO] running `"docker" "start" "-a" "db869690b806fbd35ea448380b85ed48747525c356db1b555f265c161fcb5ea8"`
[INFO] [stderr]     Checking learning_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `error_handling`
[INFO] [stderr]   --> src/main.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   error_handling,
[INFO] [stderr]    |   ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `error_handling`
[INFO] [stderr]   --> src/main.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   error_handling,
[INFO] [stderr]    |   ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `empty_vector`
[INFO] [stderr]   --> src/chapters/vectors.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |   let empty_vector: Vec<i32> = Vec::new();
[INFO] [stderr]    |       ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_empty_vector`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `blue`
[INFO] [stderr]   --> src/chapters/maps.rs:10:7
[INFO] [stderr]    |
[INFO] [stderr] 10 |   let blue = scores.get("Blue");
[INFO] [stderr]    |       ^^^^ help: if this is intentional, prefix it with an underscore: `_blue`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/chapters/error_handling.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |   let f = match f {
[INFO] [stderr]    |       ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other_error`
[INFO] [stderr]   --> src/chapters/error_handling.rs:18:7
[INFO] [stderr]    |
[INFO] [stderr] 18 |       other_error => panic!("Problem opening the file {:?}", error),
[INFO] [stderr]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_other_error`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/chapters/error_handling.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let mut f = File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stderr]    |       ^^^^^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `empty_vector`
[INFO] [stderr]   --> src/chapters/vectors.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |   let empty_vector: Vec<i32> = Vec::new();
[INFO] [stderr]    |       ^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_empty_vector`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `blue`
[INFO] [stderr]   --> src/chapters/maps.rs:10:7
[INFO] [stderr]    |
[INFO] [stderr] 10 |   let blue = scores.get("Blue");
[INFO] [stderr]    |       ^^^^ help: if this is intentional, prefix it with an underscore: `_blue`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/chapters/error_handling.rs:11:7
[INFO] [stderr]    |
[INFO] [stderr] 11 |   let f = match f {
[INFO] [stderr]    |       ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other_error`
[INFO] [stderr]   --> src/chapters/error_handling.rs:18:7
[INFO] [stderr]    |
[INFO] [stderr] 18 |       other_error => panic!("Problem opening the file {:?}", error),
[INFO] [stderr]    |       ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_other_error`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/chapters/error_handling.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let mut f = File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stderr]    |       ^^^^^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/chapters/error_handling.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let mut f = File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stderr]    |       ----^
[INFO] [stderr]    |       |
[INFO] [stderr]    |       help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/chapters/enums.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   Move { x: i32, y: i32 },
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/chapters/enums.rs:12:3
[INFO] [stderr]    |
[INFO] [stderr] 12 |   ChangeColor(i32, i32, i32),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]  --> src/chapters/pattern_matching.rs:4:3
[INFO] [stderr]   |
[INFO] [stderr] 4 |   Alabama,
[INFO] [stderr]   |   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Arkansas`
[INFO] [stderr]  --> src/chapters/pattern_matching.rs:5:3
[INFO] [stderr]   |
[INFO] [stderr] 5 |   Arkansas,
[INFO] [stderr]   |   ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alaska`
[INFO] [stderr]  --> src/chapters/pattern_matching.rs:6:3
[INFO] [stderr]   |
[INFO] [stderr] 6 |   Alaska,
[INFO] [stderr]   |   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Peny`
[INFO] [stderr]   --> src/chapters/pattern_matching.rs:11:3
[INFO] [stderr]    |
[INFO] [stderr] 11 |   Peny,
[INFO] [stderr]    |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]   --> src/chapters/pattern_matching.rs:12:3
[INFO] [stderr]    |
[INFO] [stderr] 12 |   Nickel,
[INFO] [stderr]    |   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]   --> src/chapters/pattern_matching.rs:13:3
[INFO] [stderr]    |
[INFO] [stderr] 13 |   Dime,
[INFO] [stderr]    |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `results`
[INFO] [stderr]  --> src/chapters/error_handling.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn results() {
[INFO] [stderr]   |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file`
[INFO] [stderr]   --> src/chapters/error_handling.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_short`
[INFO] [stderr]   --> src/chapters/error_handling.rs:45:4
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn read_username_from_file_short() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_x`
[INFO] [stderr]  --> src/chapters/generic_types.rs:8:3
[INFO] [stderr]   |
[INFO] [stderr] 8 |   fn get_x(&self) -> &T {
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/chapters/error_handling.rs:48:7
[INFO] [stderr]    |
[INFO] [stderr] 48 |   let mut f = File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stderr]    |       ----^
[INFO] [stderr]    |       |
[INFO] [stderr]    |       help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Move`
[INFO] [stderr]   --> src/chapters/enums.rs:10:3
[INFO] [stderr]    |
[INFO] [stderr] 10 |   Move { x: i32, y: i32 },
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ChangeColor`
[INFO] [stderr]   --> src/chapters/enums.rs:12:3
[INFO] [stderr]    |
[INFO] [stderr] 12 |   ChangeColor(i32, i32, i32),
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alabama`
[INFO] [stderr]  --> src/chapters/pattern_matching.rs:4:3
[INFO] [stderr]   |
[INFO] [stderr] 4 |   Alabama,
[INFO] [stderr]   |   ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Arkansas`
[INFO] [stderr]  --> src/chapters/pattern_matching.rs:5:3
[INFO] [stderr]   |
[INFO] [stderr] 5 |   Arkansas,
[INFO] [stderr]   |   ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Alaska`
[INFO] [stderr]  --> src/chapters/pattern_matching.rs:6:3
[INFO] [stderr]   |
[INFO] [stderr] 6 |   Alaska,
[INFO] [stderr]   |   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Peny`
[INFO] [stderr]   --> src/chapters/pattern_matching.rs:11:3
[INFO] [stderr]    |
[INFO] [stderr] 11 |   Peny,
[INFO] [stderr]    |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Nickel`
[INFO] [stderr]   --> src/chapters/pattern_matching.rs:12:3
[INFO] [stderr]    |
[INFO] [stderr] 12 |   Nickel,
[INFO] [stderr]    |   ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Dime`
[INFO] [stderr]   --> src/chapters/pattern_matching.rs:13:3
[INFO] [stderr]    |
[INFO] [stderr] 13 |   Dime,
[INFO] [stderr]    |   ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `results`
[INFO] [stderr]  --> src/chapters/error_handling.rs:5:8
[INFO] [stderr]   |
[INFO] [stderr] 5 | pub fn results() {
[INFO] [stderr]   |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file`
[INFO] [stderr]   --> src/chapters/error_handling.rs:28:4
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `read_username_from_file_short`
[INFO] [stderr]   --> src/chapters/error_handling.rs:45:4
[INFO] [stderr]    |
[INFO] [stderr] 45 | fn read_username_from_file_short() -> Result<String, io::Error> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `get_x`
[INFO] [stderr]  --> src/chapters/generic_types.rs:8:3
[INFO] [stderr]   |
[INFO] [stderr] 8 |   fn get_x(&self) -> &T {
[INFO] [stderr]   |   ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 19 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `"docker" "inspect" "db869690b806fbd35ea448380b85ed48747525c356db1b555f265c161fcb5ea8"`
[INFO] running `"docker" "rm" "-f" "db869690b806fbd35ea448380b85ed48747525c356db1b555f265c161fcb5ea8"`
[INFO] [stdout] db869690b806fbd35ea448380b85ed48747525c356db1b555f265c161fcb5ea8