[INFO] cloning repository https://github.com/LeonardoRangel12/rust_todo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/LeonardoRangel12/rust_todo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeonardoRangel12%2Frust_todo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeonardoRangel12%2Frust_todo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] da672d2d9759dee1c0e54f70b03ff3b8d4483877
[INFO] checking LeonardoRangel12/rust_todo against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLeonardoRangel12%2Frust_todo" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/LeonardoRangel12/rust_todo
[INFO] finished tweaking git repo https://github.com/LeonardoRangel12/rust_todo
[INFO] tweaked toml for git repo https://github.com/LeonardoRangel12/rust_todo written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/LeonardoRangel12/rust_todo on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/LeonardoRangel12/rust_todo 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1197748db53f089878e835740753eebdb3c98c6736d7c7b6d71acbf164cbfa60
[INFO] running `Command { std: "docker" "start" "-a" "1197748db53f089878e835740753eebdb3c98c6736d7c7b6d71acbf164cbfa60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1197748db53f089878e835740753eebdb3c98c6736d7c7b6d71acbf164cbfa60", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1197748db53f089878e835740753eebdb3c98c6736d7c7b6d71acbf164cbfa60", kill_on_drop: false }`
[INFO] [stdout] 1197748db53f089878e835740753eebdb3c98c6736d7c7b6d71acbf164cbfa60
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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 -Dunmustuse_in_always_ok" "-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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f0327e1ecd4f3e8c94aba1a479f6142c4ec46089edaf458ddd0ce85704dae8a3
[INFO] running `Command { std: "docker" "start" "-a" "f0327e1ecd4f3e8c94aba1a479f6142c4ec46089edaf458ddd0ce85704dae8a3", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.200
[INFO] [stderr]    Compiling yansi v1.0.1
[INFO] [stderr]    Compiling proc-macro2-diagnostics v0.10.1
[INFO] [stderr]    Compiling time-macros v0.2.18
[INFO] [stderr]    Compiling cookie v0.18.1
[INFO] [stderr]    Compiling libc v0.2.154
[INFO] [stderr]    Compiling futures-core v0.3.30
[INFO] [stderr]    Compiling syn v2.0.60
[INFO] [stderr]     Checking signal-hook-registry v1.4.2
[INFO] [stderr]     Checking socket2 v0.5.7
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking mio v0.8.11
[INFO] [stderr]    Compiling ref-cast v1.0.22
[INFO] [stderr]     Checking futures-util v0.3.30
[INFO] [stderr]    Compiling powerfmt v0.2.0
[INFO] [stderr]    Compiling futures-task v0.3.30
[INFO] [stderr]    Compiling http v0.2.12
[INFO] [stderr]    Compiling deranged v0.3.11
[INFO] [stderr]    Compiling futures-channel v0.3.30
[INFO] [stderr]    Compiling tracing-core v0.1.32
[INFO] [stderr]    Compiling uncased v0.9.10
[INFO] [stderr]    Compiling try-lock v0.2.5
[INFO] [stderr]     Checking getrandom v0.2.14
[INFO] [stderr]    Compiling want v0.3.1
[INFO] [stderr]    Compiling httparse v1.8.0
[INFO] [stderr]    Compiling inlinable_string v0.1.15
[INFO] [stderr]    Compiling memchr v2.7.2
[INFO] [stderr]    Compiling tower-service v0.3.2
[INFO] [stderr]    Compiling httpdate v1.0.3
[INFO] [stderr]     Checking winnow v0.6.7
[INFO] [stderr]    Compiling futures-io v0.3.30
[INFO] [stderr]    Compiling hashbrown v0.14.5
[INFO] [stderr]    Compiling rustix v0.38.34
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[INFO] [stderr]     Checking bitflags v2.5.0
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[INFO] [stderr]    Compiling tracing v0.1.40
[INFO] [stderr]    Compiling state v0.6.0
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]    Compiling tokio v1.37.0
[INFO] [stderr]     Checking parking_lot_core v0.9.10
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[INFO] [stderr]    Compiling rocket v0.5.0
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[INFO] [stderr]     Checking rand v0.8.5
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[INFO] [stderr]     Checking atomic v0.5.3
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[INFO] [stderr]    Compiling futures v0.3.30
[INFO] [stderr]     Checking tempfile v3.10.1
[INFO] [stderr]    Compiling hyper v0.14.28
[INFO] [stderr]    Compiling devise_core v0.4.1
[INFO] [stderr]    Compiling serde_derive v1.0.200
[INFO] [stderr]    Compiling tokio-macros v2.2.0
[INFO] [stderr]    Compiling ref-cast-impl v1.0.22
[INFO] [stderr]    Compiling async-stream-impl v0.3.5
[INFO] [stderr]    Compiling async-trait v0.1.80
[INFO] [stderr]    Compiling pear_codegen v0.2.9
[INFO] [stderr]     Checking async-stream v0.3.5
[INFO] [stderr]     Checking pear v0.2.9
[INFO] [stderr]    Compiling devise_codegen v0.4.1
[INFO] [stderr]    Compiling devise v0.4.1
[INFO] [stderr]    Compiling rocket_http v0.5.0
[INFO] [stderr]    Compiling rocket_codegen v0.5.0
[INFO] [stderr]     Checking tokio-util v0.7.10
[INFO] [stderr]     Checking tokio-stream v0.1.15
[INFO] [stderr]     Checking toml_datetime v0.6.5
[INFO] [stderr]     Checking serde_spanned v0.6.5
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[INFO] [stderr]     Checking toml_edit v0.22.12
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[INFO] [stderr]     Checking backend v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `BufWriter`
[INFO] [stdout]  --> src/file_io.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{BufReader, BufWriter, Error};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rocket::form::Form`
[INFO] [stdout]  --> src/form.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rocket::form::Form;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `BufWriter`
[INFO] [stdout]  --> src/file_io.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::io::{BufReader, BufWriter, Error};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `rocket::form::Form`
[INFO] [stdout]  --> src/form.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rocket::form::Form;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]  --> src/main.rs:9:17
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn get_todo(usr:&str) -> String {
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> src/main.rs:19:20
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn update_todo(usr:&str, index:usize, task:Form<Task>) -> String{
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> src/main.rs:31:20
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn delete_todo(usr:&str, index:usize) -> String{
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> src/main.rs:40:17
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn add_todo(usr:&str, task:Form<Task>) -> String{
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/file_io.rs:25:20
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Err(_) => {create_file(&path);
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Err(_) => {let _ = create_file(&path);
[INFO] [stdout]    |                    +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]  --> src/main.rs:9:17
[INFO] [stdout]   |
[INFO] [stdout] 9 | fn get_todo(usr:&str) -> String {
[INFO] [stdout]   |                 ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> src/main.rs:19:20
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn update_todo(usr:&str, index:usize, task:Form<Task>) -> String{
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> src/main.rs:31:20
[INFO] [stdout]    |
[INFO] [stdout] 31 | fn delete_todo(usr:&str, index:usize) -> String{
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<&str, Infallible>
[INFO] [stdout]   --> src/main.rs:40:17
[INFO] [stdout]    |
[INFO] [stdout] 40 | fn add_todo(usr:&str, task:Form<Task>) -> String{
[INFO] [stdout]    |                 ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/file_io.rs:25:20
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Err(_) => {create_file(&path);
[INFO] [stdout]    |                    ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 25 |         Err(_) => {let _ = create_file(&path);
[INFO] [stdout]    |                    +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `backend` (bin "backend") due to 4 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `backend` (bin "backend" test) due to 4 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "f0327e1ecd4f3e8c94aba1a479f6142c4ec46089edaf458ddd0ce85704dae8a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0327e1ecd4f3e8c94aba1a479f6142c4ec46089edaf458ddd0ce85704dae8a3", kill_on_drop: false }`
[INFO] [stdout] f0327e1ecd4f3e8c94aba1a479f6142c4ec46089edaf458ddd0ce85704dae8a3