[INFO] cloning repository https://github.com/ehlxr/rust_study
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ehlxr/rust_study" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fehlxr%2Frust_study", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fehlxr%2Frust_study'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 39bb6127de2d92a72e3da7ba9691b91570f0400c
[INFO] testing ehlxr/rust_study against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fehlxr%2Frust_study" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ehlxr/rust_study on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ehlxr/rust_study
[INFO] finished tweaking git repo https://github.com/ehlxr/rust_study
[INFO] tweaked toml for git repo https://github.com/ehlxr/rust_study written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/ehlxr/rust_study already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9c36dbfe49eb2823e1cf427c929dc454cfa52f93b3c42d54d45d9ad6372abc36
[INFO] running `Command { std: "docker" "start" "-a" "9c36dbfe49eb2823e1cf427c929dc454cfa52f93b3c42d54d45d9ad6372abc36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9c36dbfe49eb2823e1cf427c929dc454cfa52f93b3c42d54d45d9ad6372abc36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9c36dbfe49eb2823e1cf427c929dc454cfa52f93b3c42d54d45d9ad6372abc36", kill_on_drop: false }`
[INFO] [stdout] 9c36dbfe49eb2823e1cf427c929dc454cfa52f93b3c42d54d45d9ad6372abc36
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] bc94fb7d1dd092d9c41d4ce4c02e656a6145be380449d25428d2a51d33520638
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "bc94fb7d1dd092d9c41d4ce4c02e656a6145be380449d25428d2a51d33520638", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fs`
[INFO] [stdout]  --> src/main.rs:7:47
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::{collections::HashMap, fmt::Display, fs, fs::File, io, io::ErrorKind, thread};
[INFO] [stdout]   |                                               ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:640:10
[INFO] [stdout]     |
[INFO] [stdout] 640 |         1...5 => println!("one through five"),
[INFO] [stdout]     |          ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:646:12
[INFO] [stdout]     |
[INFO] [stdout] 646 |         'a'...'j' => println!("early ASCII letter"),
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:647:12
[INFO] [stdout]     |
[INFO] [stdout] 647 |         'k'...'z' => println!("late ASCII letter"),
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:779:35
[INFO] [stdout]     |
[INFO] [stdout] 779 |         Ms::Hello { id: id_var @ 3...7 } => println!("Found an id in range: {}", id_var),
[INFO] [stdout]     |                                   ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:781:27
[INFO] [stdout]     |
[INFO] [stdout] 781 |         Ms::Hello { id: 10...12 } => println!("Found an id in another range"),
[INFO] [stdout]     |                           ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:338:19
[INFO] [stdout]     |
[INFO] [stdout] 338 |         .map(|(a, b)| a)
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `diameter`
[INFO] [stdout]    --> src/main.rs:878:9
[INFO] [stdout]     |
[INFO] [stdout] 878 |         diameter: &'a i32,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `StrWrap`
[INFO] [stdout]    --> src/main.rs:888:12
[INFO] [stdout]     |
[INFO] [stdout] 888 |     struct StrWrap<'a>(&'a str);
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `fsw`
[INFO] [stdout]    --> src/main.rs:891:8
[INFO] [stdout]     |
[INFO] [stdout] 891 |     fn fsw(string: &str) -> StrWrap<'_> {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Stop`
[INFO] [stdout]    --> src/main.rs:916:9
[INFO] [stdout]     |
[INFO] [stdout] 916 |         Stop,
[INFO] [stdout]     |         ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]     --> src/main.rs:1110:5
[INFO] [stdout]      |
[INFO] [stdout] 1110 |     username: String,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `email`
[INFO] [stdout]     --> src/main.rs:1111:5
[INFO] [stdout]      |
[INFO] [stdout] 1111 |     email: String,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]     --> src/main.rs:1112:5
[INFO] [stdout]      |
[INFO] [stdout] 1112 |     sign_in_count: u64,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]     --> src/main.rs:1113:5
[INFO] [stdout]      |
[INFO] [stdout] 1113 |     active: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]     --> src/main.rs:1153:5
[INFO] [stdout]      |
[INFO] [stdout] 1153 |     height: u32,
[INFO] [stdout]      |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]     --> src/main.rs:1159:5
[INFO] [stdout]      |
[INFO] [stdout] 1159 |     width: u32,
[INFO] [stdout]      |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]     --> src/main.rs:1160:5
[INFO] [stdout]      |
[INFO] [stdout] 1160 |     height: u32,
[INFO] [stdout]      |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]     --> src/main.rs:1161:5
[INFO] [stdout]      |
[INFO] [stdout] 1161 |     options: Vec<String>,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]     --> src/main.rs:1239:5
[INFO] [stdout]      |
[INFO] [stdout] 1239 |     value: i32,
[INFO] [stdout]      |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `children`
[INFO] [stdout]     --> src/main.rs:1241:5
[INFO] [stdout]      |
[INFO] [stdout] 1241 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]     --> src/main.rs:1384:5
[INFO] [stdout]      |
[INFO] [stdout] 1384 |     pub reply: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]     --> src/main.rs:1385:5
[INFO] [stdout]      |
[INFO] [stdout] 1385 |     pub retweet: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `style`
[INFO] [stdout]     --> src/main.rs:1607:5
[INFO] [stdout]      |
[INFO] [stdout] 1607 |     style: String,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 24 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.29s
[INFO] running `Command { std: "docker" "inspect" "bc94fb7d1dd092d9c41d4ce4c02e656a6145be380449d25428d2a51d33520638", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc94fb7d1dd092d9c41d4ce4c02e656a6145be380449d25428d2a51d33520638", kill_on_drop: false }`
[INFO] [stdout] bc94fb7d1dd092d9c41d4ce4c02e656a6145be380449d25428d2a51d33520638
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84dc6debb32f4fe4c821f0b4e85600a8bc0911c8540d870f3f70a12db8b48b20
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "84dc6debb32f4fe4c821f0b4e85600a8bc0911c8540d870f3f70a12db8b48b20", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `fs`
[INFO] [stdout]  --> src/main.rs:7:47
[INFO] [stdout]   |
[INFO] [stdout] 7 | use std::{collections::HashMap, fmt::Display, fs, fs::File, io, io::ErrorKind, thread};
[INFO] [stdout]   |                                               ^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:640:10
[INFO] [stdout]     |
[INFO] [stdout] 640 |         1...5 => println!("one through five"),
[INFO] [stdout]     |          ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:646:12
[INFO] [stdout]     |
[INFO] [stdout] 646 |         'a'...'j' => println!("early ASCII letter"),
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:647:12
[INFO] [stdout]     |
[INFO] [stdout] 647 |         'k'...'z' => println!("late ASCII letter"),
[INFO] [stdout]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:779:35
[INFO] [stdout]     |
[INFO] [stdout] 779 |         Ms::Hello { id: id_var @ 3...7 } => println!("Found an id in range: {}", id_var),
[INFO] [stdout]     |                                   ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/main.rs:781:27
[INFO] [stdout]     |
[INFO] [stdout] 781 |         Ms::Hello { id: 10...12 } => println!("Found an id in another range"),
[INFO] [stdout]     |                           ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `b`
[INFO] [stdout]    --> src/main.rs:338:19
[INFO] [stdout]     |
[INFO] [stdout] 338 |         .map(|(a, b)| a)
[INFO] [stdout]     |                   ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v1`
[INFO] [stdout]     --> src/main.rs:1697:13
[INFO] [stdout]      |
[INFO] [stdout] 1697 |         let v1 = c.value(2);
[INFO] [stdout]      |             ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]     --> src/main.rs:1712:13
[INFO] [stdout]      |
[INFO] [stdout] 1712 |         let v = c.value("tetsss");
[INFO] [stdout]      |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `username`
[INFO] [stdout]     --> src/main.rs:1110:5
[INFO] [stdout]      |
[INFO] [stdout] 1110 |     username: String,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `email`
[INFO] [stdout]     --> src/main.rs:1111:5
[INFO] [stdout]      |
[INFO] [stdout] 1111 |     email: String,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `sign_in_count`
[INFO] [stdout]     --> src/main.rs:1112:5
[INFO] [stdout]      |
[INFO] [stdout] 1112 |     sign_in_count: u64,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `active`
[INFO] [stdout]     --> src/main.rs:1113:5
[INFO] [stdout]      |
[INFO] [stdout] 1113 |     active: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]     --> src/main.rs:1153:5
[INFO] [stdout]      |
[INFO] [stdout] 1153 |     height: u32,
[INFO] [stdout]      |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `width`
[INFO] [stdout]     --> src/main.rs:1159:5
[INFO] [stdout]      |
[INFO] [stdout] 1159 |     width: u32,
[INFO] [stdout]      |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `height`
[INFO] [stdout]     --> src/main.rs:1160:5
[INFO] [stdout]      |
[INFO] [stdout] 1160 |     height: u32,
[INFO] [stdout]      |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `options`
[INFO] [stdout]     --> src/main.rs:1161:5
[INFO] [stdout]      |
[INFO] [stdout] 1161 |     options: Vec<String>,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]     --> src/main.rs:1239:5
[INFO] [stdout]      |
[INFO] [stdout] 1239 |     value: i32,
[INFO] [stdout]      |     ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `children`
[INFO] [stdout]     --> src/main.rs:1241:5
[INFO] [stdout]      |
[INFO] [stdout] 1241 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `reply`
[INFO] [stdout]     --> src/main.rs:1384:5
[INFO] [stdout]      |
[INFO] [stdout] 1384 |     pub reply: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `retweet`
[INFO] [stdout]     --> src/main.rs:1385:5
[INFO] [stdout]      |
[INFO] [stdout] 1385 |     pub retweet: bool,
[INFO] [stdout]      |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `style`
[INFO] [stdout]     --> src/main.rs:1607:5
[INFO] [stdout]      |
[INFO] [stdout] 1607 |     style: String,
[INFO] [stdout]      |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 2.13s
[INFO] running `Command { std: "docker" "inspect" "84dc6debb32f4fe4c821f0b4e85600a8bc0911c8540d870f3f70a12db8b48b20", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84dc6debb32f4fe4c821f0b4e85600a8bc0911c8540d870f3f70a12db8b48b20", kill_on_drop: false }`
[INFO] [stdout] 84dc6debb32f4fe4c821f0b4e85600a8bc0911c8540d870f3f70a12db8b48b20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7db320c5f51b8809fc681499e064698ac6ba66df22581d05dbe1a29de3c5f84e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "7db320c5f51b8809fc681499e064698ac6ba66df22581d05dbe1a29de3c5f84e", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `fs`
[INFO] [stderr]  --> src/main.rs:7:47
[INFO] [stderr]   |
[INFO] [stderr] 7 | use std::{collections::HashMap, fmt::Display, fs, fs::File, io, io::ErrorKind, thread};
[INFO] [stderr]   |                                               ^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/main.rs:640:10
[INFO] [stderr]     |
[INFO] [stderr] 640 |         1...5 => println!("one through five"),
[INFO] [stderr]     |          ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/main.rs:646:12
[INFO] [stderr]     |
[INFO] [stderr] 646 |         'a'...'j' => println!("early ASCII letter"),
[INFO] [stderr]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/main.rs:647:12
[INFO] [stderr]     |
[INFO] [stderr] 647 |         'k'...'z' => println!("late ASCII letter"),
[INFO] [stderr]     |            ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/main.rs:779:35
[INFO] [stderr]     |
[INFO] [stderr] 779 |         Ms::Hello { id: id_var @ 3...7 } => println!("Found an id in range: {}", id_var),
[INFO] [stderr]     |                                   ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/main.rs:781:27
[INFO] [stderr]     |
[INFO] [stderr] 781 |         Ms::Hello { id: 10...12 } => println!("Found an id in another range"),
[INFO] [stderr]     |                           ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `b`
[INFO] [stderr]    --> src/main.rs:338:19
[INFO] [stderr]     |
[INFO] [stderr] 338 |         .map(|(a, b)| a)
[INFO] [stderr]     |                   ^ help: if this is intentional, prefix it with an underscore: `_b`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v1`
[INFO] [stderr]     --> src/main.rs:1697:13
[INFO] [stderr]      |
[INFO] [stderr] 1697 |         let v1 = c.value(2);
[INFO] [stderr]      |             ^^ help: if this is intentional, prefix it with an underscore: `_v1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]     --> src/main.rs:1712:13
[INFO] [stderr]      |
[INFO] [stderr] 1712 |         let v = c.value("tetsss");
[INFO] [stderr]      |             ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `username`
[INFO] [stderr]     --> src/main.rs:1110:5
[INFO] [stderr]      |
[INFO] [stderr] 1110 |     username: String,
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `email`
[INFO] [stderr]     --> src/main.rs:1111:5
[INFO] [stderr]      |
[INFO] [stderr] 1111 |     email: String,
[INFO] [stderr]      |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `sign_in_count`
[INFO] [stderr]     --> src/main.rs:1112:5
[INFO] [stderr]      |
[INFO] [stderr] 1112 |     sign_in_count: u64,
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `active`
[INFO] [stderr]     --> src/main.rs:1113:5
[INFO] [stderr]      |
[INFO] [stderr] 1113 |     active: bool,
[INFO] [stderr]      |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `height`
[INFO] [stderr]     --> src/main.rs:1153:5
[INFO] [stderr]      |
[INFO] [stderr] 1153 |     height: u32,
[INFO] [stderr]      |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `width`
[INFO] [stderr]     --> src/main.rs:1159:5
[INFO] [stderr]      |
[INFO] [stderr] 1159 |     width: u32,
[INFO] [stderr]      |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `height`
[INFO] [stderr]     --> src/main.rs:1160:5
[INFO] [stderr]      |
[INFO] [stderr] 1160 |     height: u32,
[INFO] [stderr]      |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `options`
[INFO] [stderr]     --> src/main.rs:1161:5
[INFO] [stderr]      |
[INFO] [stderr] 1161 |     options: Vec<String>,
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `value`
[INFO] [stderr]     --> src/main.rs:1239:5
[INFO] [stderr]      |
[INFO] [stderr] 1239 |     value: i32,
[INFO] [stderr]      |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `children`
[INFO] [stderr]     --> src/main.rs:1241:5
[INFO] [stderr]      |
[INFO] [stderr] 1241 |     children: RefCell<Vec<Rc<Node>>>,
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `reply`
[INFO] [stderr]     --> src/main.rs:1384:5
[INFO] [stderr]      |
[INFO] [stderr] 1384 |     pub reply: bool,
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `retweet`
[INFO] [stderr]     --> src/main.rs:1385:5
[INFO] [stderr]      |
[INFO] [stderr] 1385 |     pub retweet: bool,
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `style`
[INFO] [stderr]     --> src/main.rs:1607:5
[INFO] [stderr]      |
[INFO] [stderr] 1607 |     style: String,
[INFO] [stderr]      |     ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_study` (bin "rust_study" test) generated 22 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_study-7ca0f346e34c9ca5)
[INFO] [stdout] running 6 tests
[INFO] [stdout] test tests::call_with_different_type ... ok
[INFO] [stdout] test tests::call_with_different_values ... ok
[INFO] [stdout] test tests::it_works ... ok
[INFO] [stdout] test tests::iterator_demonstration ... ok
[INFO] [stdout] test tests::it_sends_an_over_75_percent_warning_message ... ok
[INFO] [stdout] test tests::iterator_sum ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 6 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "7db320c5f51b8809fc681499e064698ac6ba66df22581d05dbe1a29de3c5f84e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7db320c5f51b8809fc681499e064698ac6ba66df22581d05dbe1a29de3c5f84e", kill_on_drop: false }`
[INFO] [stdout] 7db320c5f51b8809fc681499e064698ac6ba66df22581d05dbe1a29de3c5f84e