[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 f1c52bf13c990fc425c542cc90a0396a87db24ba for pr-164812
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbnpysse%2Frust_by_example_19" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[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-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/bnpysse/rust_by_example_19 on toolchain f1c52bf13c990fc425c542cc90a0396a87db24ba
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c0af3998e971868164375a7dfb646c9933ddd1a3bdb00fa2041266763dc1eeab" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc
[INFO] running `Command { std: "docker" "start" "9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc" "/opt/rustwide/cargo-home/bin/cargo" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc" "/opt/rustwide/cargo-home/bin/cargo" "+f1c52bf13c990fc425c542cc90a0396a87db24ba" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]     Checking rust_by_example_19 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `HashMap` and `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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `HashMap` and `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)]` (part of `#[warn(unused)]`) 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` and `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 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` and `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 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)]` (part of `#[warn(unused)]`) on by default
[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)]` (part of `#[warn(unused)]`) 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]     |         ^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `None`
[INFO] [stdout]     |
[INFO] [stdout] 250 -     let none: Option<i32> = None;
[INFO] [stdout] 250 +     let std::prelude::v1::None: Option<i32> = None;
[INFO] [stdout]     |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 250 |     let _none: Option<i32> = None;
[INFO] [stdout]     |         +
[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]     |         ^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: you might have meant to pattern match on the similarly named variant `None`
[INFO] [stdout]     |
[INFO] [stdout] 250 -     let none: Option<i32> = None;
[INFO] [stdout] 250 +     let std::prelude::v1::None: Option<i32> = None;
[INFO] [stdout]     |
[INFO] [stdout] help: if this is intentional, prefix it with an underscore
[INFO] [stdout]     |
[INFO] [stdout] 250 |     let _none: Option<i32> = None;
[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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MathError` is never used
[INFO] [stdout]    --> src/main.rs:494:14
[INFO] [stdout]     |
[INFO] [stdout] 494 |     pub enum MathError {
[INFO] [stdout]     |              ^^^^^^^^^
[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: enum `MathError` is never used
[INFO] [stdout]    --> src/main.rs:525:14
[INFO] [stdout]     |
[INFO] [stdout] 525 |     pub enum MathError {
[INFO] [stdout]     |              ^^^^^^^^^
[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 `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 an 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 `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)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MathError` is never used
[INFO] [stdout]    --> src/main.rs:494:14
[INFO] [stdout]     |
[INFO] [stdout] 494 |     pub enum MathError {
[INFO] [stdout]     |              ^^^^^^^^^
[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: enum `MathError` is never used
[INFO] [stdout]    --> src/main.rs:525:14
[INFO] [stdout]     |
[INFO] [stdout] 525 |     pub enum MathError {
[INFO] [stdout]     |              ^^^^^^^^^
[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 `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 an 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] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc", kill_on_drop: false }`
[INFO] [stdout] 9f62d269e0c65639df505554ddc6b8fbf36bbb636c79b2eed2991ea5365007dc
