[INFO] cloning repository https://github.com/syuni/rust-by-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/syuni/rust-by-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsyuni%2Frust-by-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsyuni%2Frust-by-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b3f4cf9a5219e47165d823446a761a963ce48beb
[INFO] checking syuni/rust-by-example against master#9503ea19edbf01b9435e80e17d60ce1b88390116 for pr-81782
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsyuni%2Frust-by-example" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/syuni/rust-by-example on toolchain 9503ea19edbf01b9435e80e17d60ce1b88390116
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/syuni/rust-by-example
[INFO] finished tweaking git repo https://github.com/syuni/rust-by-example
[INFO] tweaked toml for git repo https://github.com/syuni/rust-by-example written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/syuni/rust-by-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /workspace/builds/worker-8/source/src/8_2_4.rs
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3bb8a58955f8f9140f30199e14c18e00b7f7cda5da1da0030d559ab0da0b5141
[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" "3bb8a58955f8f9140f30199e14c18e00b7f7cda5da1da0030d559ab0da0b5141", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3bb8a58955f8f9140f30199e14c18e00b7f7cda5da1da0030d559ab0da0b5141", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bb8a58955f8f9140f30199e14c18e00b7f7cda5da1da0030d559ab0da0b5141", kill_on_drop: false }`
[INFO] [stdout] 3bb8a58955f8f9140f30199e14c18e00b7f7cda5da1da0030d559ab0da0b5141
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:f2f6bcd4b43ebee4e173f653a26493129bdb64017c85f916b780ca7fbdbaa79d" "/opt/rustwide/cargo-home/bin/cargo" "+9503ea19edbf01b9435e80e17d60ce1b88390116" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] df3c3313128bfbdd877859b6076b8c382f7c78f436efb7070021e076293e4355
[INFO] running `Command { std: "docker" "start" "-a" "df3c3313128bfbdd877859b6076b8c382f7c78f436efb7070021e076293e4355", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /opt/rustwide/workdir/src/8_2_4.rs
[INFO] [stderr]     Checking rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `x`
[INFO] [stdout]  --> src/17_1.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     x: f64,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `y`
[INFO] [stdout]  --> src/17_1.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     y: f64,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stdout]   --> src/8_2_6_2.rs:23:16
[INFO] [stdout]    |
[INFO] [stdout] 23 |         array2.into_iter().find(|&&x| x == 2)
[INFO] [stdout]    |                ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(array_into_iter)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: cannot pass `self` by raw pointer
[INFO] [stdout]   --> src/16_10.rs:39:15
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn cause(*self) -> Option<&error::Error> {
[INFO] [stdout]    |               ^^^^ cannot pass `self` by raw pointer
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
[INFO] [stdout]   --> src/8_2_6_1.rs:16:40
[INFO] [stdout]    |
[INFO] [stdout] 16 |     println!("2 in array2: {}", array2.into_iter().any(|&x| x == 2));
[INFO] [stdout]    |                                        ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(array_into_iter)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/16_10.rs:6:45
[INFO] [stdout]   |
[INFO] [stdout] 6 | type Result<T> = std::result::Result<T, Box<error::Error>>;
[INFO] [stdout]   |                                             ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/16_10.rs:39:32
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn cause(*self) -> Option<&error::Error> {
[INFO] [stdout]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn error::Error`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0106]: missing lifetime specifier
[INFO] [stdout]   --> src/16_10.rs:39:31
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn cause(*self) -> Option<&error::Error> {
[INFO] [stdout]    |                               ^ expected named lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout]    = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
[INFO] [stdout] help: consider using the `'static` lifetime
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn cause(*self) -> Option<&'static error::Error> {
[INFO] [stdout]    |                               ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused arithmetic operation that must be used
[INFO] [stdout]   --> src/6.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |         2 * x;
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/18_4_2.rs:20:63
[INFO] [stdout]    |
[INFO] [stdout] 20 |         Err(why) => panic!("couldn't create {}: {}", display, Error::description(&why)),
[INFO] [stdout]    |                                                               ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/18_4_2.rs:29:13
[INFO] [stdout]    |
[INFO] [stdout] 29 |             Error::description(&why)
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/17_5_1.rs:48:32
[INFO] [stdout]    |
[INFO] [stdout] 48 |               Err(why) => panic!(match why {
[INFO] [stdout]    |  ________________________________^
[INFO] [stdout] 49 | |                 MathError::NegativeLogarithm => "logarithm of negative number",
[INFO] [stdout] 50 | |                 MathError::DivisionByZero => "division by zero",
[INFO] [stdout] 51 | |                 MathError::NegativeSquareRoot => "square root of negative number",
[INFO] [stdout] 52 | |             }),
[INFO] [stdout]    | |_____________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 48 |             Err(why) => panic!("{}", match why {
[INFO] [stdout]    |                                ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 48 |             Err(why) => std::panic::panic_any(match why {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected type, found `}`
[INFO] [stdout]   --> src/14_4_6.rs:21:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |         println!("{} is the first", choose_first(&first, &second)):
[INFO] [stdout]    |                                                                   - help: try using a semicolon: `;`
[INFO] [stdout] 21 |     };
[INFO] [stdout]    |     ^ expected type
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#![feature(type_ascription)]` lets you annotate an expression with a type: `<expr>: <type>`
[INFO] [stdout]    = note: see issue #23416 <https://github.com/rust-lang/rust/issues/23416> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust-by-example`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0053]: method `cause` has an incompatible type for trait
[INFO] [stdout]   --> src/16_10.rs:39:5
[INFO] [stdout]    |
[INFO] [stdout] 39 |     fn cause(*self) -> Option<&error::Error> {
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `&DoubleError`, found enum `DoubleError`
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected fn pointer `fn(&DoubleError) -> Option<&dyn std::error::Error>`
[INFO] [stdout]               found fn pointer `fn(DoubleError) -> Option<&'static (dyn std::error::Error + 'static)>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated associated function `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/16_10.rs:35:44
[INFO] [stdout]    |
[INFO] [stdout] 35 |             DoubleError::Parse(ref e) => e.description(),
[INFO] [stdout]    |                                            ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0614]: type `DoubleError` cannot be dereferenced
[INFO] [stdout]   --> src/16_10.rs:40:15
[INFO] [stdout]    |
[INFO] [stdout] 40 |         match *self {
[INFO] [stdout]    |               ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0053, E0106, E0614.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0053`.
[INFO] [stdout] 
[INFO] [stdout] warning: panic message is not a string literal
[INFO] [stdout]   --> src/17_5_1.rs:48:32
[INFO] [stdout]    |
[INFO] [stdout] 48 |               Err(why) => panic!(match why {
[INFO] [stdout]    |  ________________________________^
[INFO] [stdout] 49 | |                 MathError::NegativeLogarithm => "logarithm of negative number",
[INFO] [stdout] 50 | |                 MathError::DivisionByZero => "division by zero",
[INFO] [stdout] 51 | |                 MathError::NegativeSquareRoot => "square root of negative number",
[INFO] [stdout] 52 | |             }),
[INFO] [stdout]    | |_____________^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_fmt_panic)]` on by default
[INFO] [stdout]    = note: this is no longer accepted in Rust 2021
[INFO] [stdout] help: add a "{}" format string to Display the message
[INFO] [stdout]    |
[INFO] [stdout] 48 |             Err(why) => panic!("{}", match why {
[INFO] [stdout]    |                                ^^^^^
[INFO] [stdout] help: or use std::panic::panic_any instead
[INFO] [stdout]    |
[INFO] [stdout] 48 |             Err(why) => std::panic::panic_any(match why {
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "df3c3313128bfbdd877859b6076b8c382f7c78f436efb7070021e076293e4355", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df3c3313128bfbdd877859b6076b8c382f7c78f436efb7070021e076293e4355", kill_on_drop: false }`
[INFO] [stdout] df3c3313128bfbdd877859b6076b8c382f7c78f436efb7070021e076293e4355