[INFO] cloning repository https://github.com/shakib-mehrab/lets_get_rusty_course
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shakib-mehrab/lets_get_rusty_course" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshakib-mehrab%2Flets_get_rusty_course", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshakib-mehrab%2Flets_get_rusty_course'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1f1fb81aef2a1c648f60899939f42e94ce70834d
[INFO] checking shakib-mehrab/lets_get_rusty_course against try#95813608313bff49cfc1afc393a946a3c085b772 for pr-148946
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshakib-mehrab%2Flets_get_rusty_course" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/shakib-mehrab/lets_get_rusty_course
[INFO] finished tweaking git repo https://github.com/shakib-mehrab/lets_get_rusty_course
[INFO] tweaked toml for git repo https://github.com/shakib-mehrab/lets_get_rusty_course written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/shakib-mehrab/lets_get_rusty_course on toolchain 95813608313bff49cfc1afc393a946a3c085b772
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+95813608313bff49cfc1afc393a946a3c085b772" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/shakib-mehrab/lets_get_rusty_course 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" "+95813608313bff49cfc1afc393a946a3c085b772" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+95813608313bff49cfc1afc393a946a3c085b772" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6da4abe420ed37b1b3e9ea3d748adf67d9a0e687af6239ca13353983e0b33232
[INFO] running `Command { std: "docker" "start" "-a" "6da4abe420ed37b1b3e9ea3d748adf67d9a0e687af6239ca13353983e0b33232", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6da4abe420ed37b1b3e9ea3d748adf67d9a0e687af6239ca13353983e0b33232", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6da4abe420ed37b1b3e9ea3d748adf67d9a0e687af6239ca13353983e0b33232", kill_on_drop: false }`
[INFO] [stdout] 6da4abe420ed37b1b3e9ea3d748adf67d9a0e687af6239ca13353983e0b33232
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+95813608313bff49cfc1afc393a946a3c085b772" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ff1faf836943b513b17ed728710601a3f17c6c237fc8cae9f997ce03bbaf542a
[INFO] running `Command { std: "docker" "start" "-a" "ff1faf836943b513b17ed728710601a3f17c6c237fc8cae9f997ce03bbaf542a", kill_on_drop: false }`
[INFO] [stderr]     Checking lets_get_rusty_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]  --> src/bin/chain_method.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> src/bin/error_handling.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let f = match f { // as it will return a result then we are matching if it is ok or error 
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_file`
[INFO] [stdout]   --> src/bin/error_handling.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |    let new_file = File::open("new_file.txt").unwrap_or_else(|error|  { 
[INFO] [stdout]    |        ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]  --> src/bin/question_mark.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]  --> src/bin/question_mark.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read_username_from_file` is never used
[INFO] [stdout]  --> src/bin/chain_method.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn read_username_from_file() -> Result<String, io::Error> {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]  --> src/bin/error_handling.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let f = match f { // as it will return a result then we are matching if it is ok or error 
[INFO] [stdout]   |         ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `new_file`
[INFO] [stdout]   --> src/bin/error_handling.rs:21:8
[INFO] [stdout]    |
[INFO] [stdout] 21 |    let new_file = File::open("new_file.txt").unwrap_or_else(|error|  { 
[INFO] [stdout]    |        ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_new_file`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `greater_character` is never used
[INFO] [stdout]   --> src/bin/generec_types.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 |     fn greater_character(character: Vec<char>) -> char {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "ff1faf836943b513b17ed728710601a3f17c6c237fc8cae9f997ce03bbaf542a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff1faf836943b513b17ed728710601a3f17c6c237fc8cae9f997ce03bbaf542a", kill_on_drop: false }`
[INFO] [stdout] ff1faf836943b513b17ed728710601a3f17c6c237fc8cae9f997ce03bbaf542a