[INFO] cloning repository https://github.com/bnpysse/rust_by_example_19
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bnpysse/rust_by_example_19" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbnpysse%2Frust_by_example_19", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbnpysse%2Frust_by_example_19'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 44be002630fc6d065ae74c6d02ab0b0bd83e8059
[INFO] checking bnpysse/rust_by_example_19 against master#c5af0610196bc39c44e54f1e08bd9149bdc66929 for pr-118120
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbnpysse%2Frust_by_example_19" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bnpysse/rust_by_example_19 on toolchain c5af0610196bc39c44e54f1e08bd9149bdc66929
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c5af0610196bc39c44e54f1e08bd9149bdc66929" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bnpysse/rust_by_example_19
[INFO] finished tweaking git repo https://github.com/bnpysse/rust_by_example_19
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[INFO] crate git repo https://github.com/bnpysse/rust_by_example_19 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" "+c5af0610196bc39c44e54f1e08bd9149bdc66929" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking bnpysse/rust_by_example_19 against try#a832c07a2bcc7587230eb0706f83d1d602ae5c2b for pr-118120
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbnpysse%2Frust_by_example_19" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bnpysse/rust_by_example_19 on toolchain a832c07a2bcc7587230eb0706f83d1d602ae5c2b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a832c07a2bcc7587230eb0706f83d1d602ae5c2b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/bnpysse/rust_by_example_19
[INFO] finished tweaking git repo https://github.com/bnpysse/rust_by_example_19
[INFO] tweaked toml for git repo https://github.com/bnpysse/rust_by_example_19 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/bnpysse/rust_by_example_19 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" "+a832c07a2bcc7587230eb0706f83d1d602ae5c2b" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+a832c07a2bcc7587230eb0706f83d1d602ae5c2b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cf56c83f2f064d25d98c2c7f26b6b64e5e528471a4fa2fd47be1ef75d862980c
[INFO] running `Command { std: "docker" "start" "-a" "cf56c83f2f064d25d98c2c7f26b6b64e5e528471a4fa2fd47be1ef75d862980c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cf56c83f2f064d25d98c2c7f26b6b64e5e528471a4fa2fd47be1ef75d862980c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf56c83f2f064d25d98c2c7f26b6b64e5e528471a4fa2fd47be1ef75d862980c", kill_on_drop: false }`
[INFO] [stdout] cf56c83f2f064d25d98c2c7f26b6b64e5e528471a4fa2fd47be1ef75d862980c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+a832c07a2bcc7587230eb0706f83d1d602ae5c2b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2b36f3377421a032943c7ad33b685f25c7270610237919ff4161f04ea0580f3f
[INFO] running `Command { std: "docker" "start" "-a" "2b36f3377421a032943c7ad33b685f25c7270610237919ff4161f04ea0580f3f", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_by_example_19 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `HashMap`, `HashSet`
[INFO] [stdout]  --> src/main.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `MathError`, `MathResult`
[INFO] [stdout]  --> src/main.rs:5:22
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::checked::{MathError, MathResult};
[INFO] [stdout]   |                      ^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `HashMap`, `HashSet`
[INFO] [stdout]  --> src/main.rs:3:24
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::collections::{HashMap, HashSet};
[INFO] [stdout]   |                        ^^^^^^^  ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::rc::Rc`
[INFO] [stdout]  --> src/main.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::rc::Rc;
[INFO] [stdout]   |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `MathError`, `MathResult`
[INFO] [stdout]  --> src/main.rs:5:22
[INFO] [stdout]   |
[INFO] [stdout] 5 | use crate::checked::{MathError, MathResult};
[INFO] [stdout]   |                      ^^^^^^^^^  ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `HashMap` is imported redundantly
[INFO] [stdout]    --> src/main.rs:318:9
[INFO] [stdout]     |
[INFO] [stdout] 3   | use std::collections::{HashMap, HashSet};
[INFO] [stdout]     |                        ------- the item `HashMap` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 318 |     use std::collections::HashMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `HashSet` is imported redundantly
[INFO] [stdout]    --> src/main.rs:425:9
[INFO] [stdout]     |
[INFO] [stdout] 3   | use std::collections::{HashMap, HashSet};
[INFO] [stdout]     |                                 ------- the item `HashSet` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 425 |     use std::collections::HashSet;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `HashMap` is imported redundantly
[INFO] [stdout]    --> src/main.rs:318:9
[INFO] [stdout]     |
[INFO] [stdout] 3   | use std::collections::{HashMap, HashSet};
[INFO] [stdout]     |                        ------- the item `HashMap` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 318 |     use std::collections::HashMap;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]    --> src/main.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 4   | use std::rc::Rc;
[INFO] [stdout]     |     ----------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 453 |     use std::rc::Rc;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `HashSet` is imported redundantly
[INFO] [stdout]    --> src/main.rs:425:9
[INFO] [stdout]     |
[INFO] [stdout] 3   | use std::collections::{HashMap, HashSet};
[INFO] [stdout]     |                                 ------- the item `HashSet` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 425 |     use std::collections::HashSet;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `Rc` is imported redundantly
[INFO] [stdout]    --> src/main.rs:453:9
[INFO] [stdout]     |
[INFO] [stdout] 4   | use std::rc::Rc;
[INFO] [stdout]     |     ----------- the item `Rc` is already imported here
[INFO] [stdout] ...
[INFO] [stdout] 453 |     use std::rc::Rc;
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotes`
[INFO] [stdout]    --> src/main.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 215 |     let quotes = br#"You can also use "fancier" formatting, \
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotes`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]    --> src/main.rs:250:9
[INFO] [stdout]     |
[INFO] [stdout] 250 |     let none: Option<i32> = None;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `quotes`
[INFO] [stdout]    --> src/main.rs:215:9
[INFO] [stdout]     |
[INFO] [stdout] 215 |     let quotes = br#"You can also use "fancier" formatting, \
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_quotes`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `none`
[INFO] [stdout]    --> src/main.rs:250:9
[INFO] [stdout]     |
[INFO] [stdout] 250 |     let none: Option<i32> = None;
[INFO] [stdout]     |         ^^^^ help: if this is intentional, prefix it with an underscore: `_none`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `DivisionByZero`, `NegativeLogarithm`, and `NegativeSquareRoot` are never constructed
[INFO] [stdout]    --> src/main.rs:495:9
[INFO] [stdout]     |
[INFO] [stdout] 494 |     pub enum MathError {
[INFO] [stdout]     |              --------- variants in this enum
[INFO] [stdout] 495 |         DivisionByZero,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 496 |         NegativeLogarithm,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 497 |         NegativeSquareRoot,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `MathError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MathResult` is never used
[INFO] [stdout]    --> src/main.rs:499:14
[INFO] [stdout]     |
[INFO] [stdout] 499 |     pub type MathResult = Result<f64, MathError>;
[INFO] [stdout]     |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]    --> src/main.rs:500:12
[INFO] [stdout]     |
[INFO] [stdout] 500 |     pub fn sqrt(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ln` is never used
[INFO] [stdout]    --> src/main.rs:508:12
[INFO] [stdout]     |
[INFO] [stdout] 508 |     pub fn ln(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `div` is never used
[INFO] [stdout]    --> src/main.rs:515:12
[INFO] [stdout]     |
[INFO] [stdout] 515 |     pub fn div(x: f64, y: f64) -> MathResult {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `DivisionByZero`, `NegativeLogarithm`, and `NegativeSquareRoot` are never constructed
[INFO] [stdout]    --> src/main.rs:526:9
[INFO] [stdout]     |
[INFO] [stdout] 525 |     pub enum MathError {
[INFO] [stdout]     |              --------- variants in this enum
[INFO] [stdout] 526 |         DivisionByZero,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 527 |         NegativeLogarithm,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 528 |         NegativeSquareRoot,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `MathError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MathResult` is never used
[INFO] [stdout]    --> src/main.rs:530:14
[INFO] [stdout]     |
[INFO] [stdout] 530 |     pub type MathResult = Result<f64, MathError>;
[INFO] [stdout]     |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]    --> src/main.rs:531:12
[INFO] [stdout]     |
[INFO] [stdout] 531 |     pub fn sqrt(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ln` is never used
[INFO] [stdout]    --> src/main.rs:539:12
[INFO] [stdout]     |
[INFO] [stdout] 539 |     pub fn ln(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `div` is never used
[INFO] [stdout]    --> src/main.rs:546:8
[INFO] [stdout]     |
[INFO] [stdout] 546 |     fn div(x: f64, y: f64) -> MathResult {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `op_` is never used
[INFO] [stdout]    --> src/main.rs:553:8
[INFO] [stdout]     |
[INFO] [stdout] 553 |     fn op_(x: f64, y: f64) -> MathResult {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `division_int` is never used
[INFO] [stdout]    --> src/main.rs:297:8
[INFO] [stdout]     |
[INFO] [stdout] 297 |     fn division_int(dividend: i32, divisor: i32) -> i32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `op` is never used
[INFO] [stdout]    --> src/main.rs:560:12
[INFO] [stdout]     |
[INFO] [stdout] 560 |     pub fn op(x: f64, y: f64) {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `DivisionByZero`, `NegativeLogarithm`, and `NegativeSquareRoot` are never constructed
[INFO] [stdout]    --> src/main.rs:495:9
[INFO] [stdout]     |
[INFO] [stdout] 494 |     pub enum MathError {
[INFO] [stdout]     |              --------- variants in this enum
[INFO] [stdout] 495 |         DivisionByZero,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 496 |         NegativeLogarithm,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 497 |         NegativeSquareRoot,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `MathError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MathResult` is never used
[INFO] [stdout]    --> src/main.rs:499:14
[INFO] [stdout]     |
[INFO] [stdout] 499 |     pub type MathResult = Result<f64, MathError>;
[INFO] [stdout]     |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]    --> src/main.rs:500:12
[INFO] [stdout]     |
[INFO] [stdout] 500 |     pub fn sqrt(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ln` is never used
[INFO] [stdout]    --> src/main.rs:508:12
[INFO] [stdout]     |
[INFO] [stdout] 508 |     pub fn ln(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `div` is never used
[INFO] [stdout]    --> src/main.rs:515:12
[INFO] [stdout]     |
[INFO] [stdout] 515 |     pub fn div(x: f64, y: f64) -> MathResult {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `DivisionByZero`, `NegativeLogarithm`, and `NegativeSquareRoot` are never constructed
[INFO] [stdout]    --> src/main.rs:526:9
[INFO] [stdout]     |
[INFO] [stdout] 525 |     pub enum MathError {
[INFO] [stdout]     |              --------- variants in this enum
[INFO] [stdout] 526 |         DivisionByZero,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout] 527 |         NegativeLogarithm,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 528 |         NegativeSquareRoot,
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `MathError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `MathResult` is never used
[INFO] [stdout]    --> src/main.rs:530:14
[INFO] [stdout]     |
[INFO] [stdout] 530 |     pub type MathResult = Result<f64, MathError>;
[INFO] [stdout]     |              ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error
[INFO] [stdout]    --> src/main.rs:222:11
[INFO] [stdout]     |
[INFO] [stdout] 219 |     let shift_jis = b"\x82\xe6\x82\xa8\x82\xb1\x82"; // SHIFT-JIS 编码的 "ようこそ"
[INFO] [stdout]     |                     ------------------------------- the literal was valid UTF-8 up to the 0 bytes
[INFO] [stdout] ...
[INFO] [stdout] 222 |     match str::from_utf8(shift_jis) {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(invalid_from_utf8)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sqrt` is never used
[INFO] [stdout]    --> src/main.rs:531:12
[INFO] [stdout]     |
[INFO] [stdout] 531 |     pub fn sqrt(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `ln` is never used
[INFO] [stdout]    --> src/main.rs:539:12
[INFO] [stdout]     |
[INFO] [stdout] 539 |     pub fn ln(x: f64) -> MathResult {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `div` is never used
[INFO] [stdout]    --> src/main.rs:546:8
[INFO] [stdout]     |
[INFO] [stdout] 546 |     fn div(x: f64, y: f64) -> MathResult {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `op_` is never used
[INFO] [stdout]    --> src/main.rs:553:8
[INFO] [stdout]     |
[INFO] [stdout] 553 |     fn op_(x: f64, y: f64) -> MathResult {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `op` is never used
[INFO] [stdout]    --> src/main.rs:560:12
[INFO] [stdout]     |
[INFO] [stdout] 560 |     pub fn op(x: f64, y: f64) {
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::str::from_utf8` with a invalid literal always return an error
[INFO] [stdout]    --> src/main.rs:222:11
[INFO] [stdout]     |
[INFO] [stdout] 219 |     let shift_jis = b"\x82\xe6\x82\xa8\x82\xb1\x82"; // SHIFT-JIS 编码的 "ようこそ"
[INFO] [stdout]     |                     ------------------------------- the literal was valid UTF-8 up to the 0 bytes
[INFO] [stdout] ...
[INFO] [stdout] 222 |     match str::from_utf8(shift_jis) {
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(invalid_from_utf8)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 21 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 22 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `Command { std: "docker" "inspect" "2b36f3377421a032943c7ad33b685f25c7270610237919ff4161f04ea0580f3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b36f3377421a032943c7ad33b685f25c7270610237919ff4161f04ea0580f3f", kill_on_drop: false }`
[INFO] [stdout] 2b36f3377421a032943c7ad33b685f25c7270610237919ff4161f04ea0580f3f