[INFO] cloning repository https://github.com/jeraldgan/rust-primer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jeraldgan/rust-primer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeraldgan%2Frust-primer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeraldgan%2Frust-primer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8722a96df067afa7439b1de35ff57b32ad9c3f66
[INFO] checking jeraldgan/rust-primer against master#4fa76a4a7742bb9c1febe33019f5a9e7e4839a65 for pr-83744
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeraldgan%2Frust-primer" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jeraldgan/rust-primer on toolchain 4fa76a4a7742bb9c1febe33019f5a9e7e4839a65
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jeraldgan/rust-primer
[INFO] finished tweaking git repo https://github.com/jeraldgan/rust-primer
[INFO] tweaked toml for git repo https://github.com/jeraldgan/rust-primer written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/jeraldgan/rust-primer already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] error: the lock file /workspace/builds/worker-9/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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] 8cdb8842c0a2116c37a411dab547de33e13c1b143074bb555f400b85d6da9ad8
[INFO] running `Command { std: "docker" "start" "-a" "8cdb8842c0a2116c37a411dab547de33e13c1b143074bb555f400b85d6da9ad8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8cdb8842c0a2116c37a411dab547de33e13c1b143074bb555f400b85d6da9ad8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8cdb8842c0a2116c37a411dab547de33e13c1b143074bb555f400b85d6da9ad8", kill_on_drop: false }`
[INFO] [stdout] 8cdb8842c0a2116c37a411dab547de33e13c1b143074bb555f400b85d6da9ad8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+4fa76a4a7742bb9c1febe33019f5a9e7e4839a65" "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] d5cb617caf6a614507dba51498be986cfa6c7a9a95bb7dd001eda0bd4de50bbb
[INFO] running `Command { std: "docker" "start" "-a" "d5cb617caf6a614507dba51498be986cfa6c7a9a95bb7dd001eda0bd4de50bbb", kill_on_drop: false }`
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.69
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking os_str_bytes v2.4.0
[INFO] [stderr]     Checking exercise-libraries v0.1.0 (/opt/rustwide/workdir/07-external-libraries/exercise)
[INFO] [stderr]     Checking exercise-hello v0.1.0 (/opt/rustwide/workdir/01-hello/exercise)
[INFO] [stderr]     Checking exercise-structs v0.1.0 (/opt/rustwide/workdir/03-structs-lifetimes/exercise)
[INFO] [stderr]     Checking structs-exercise v0.1.0 (/opt/rustwide/workdir/02-basics/exercise)
[INFO] [stderr]     Checking demo-strings v0.1.0 (/opt/rustwide/workdir/06-strings/demo)
[INFO] [stderr]     Checking demo-match v0.1.0 (/opt/rustwide/workdir/05-match-result/demo)
[INFO] [stderr]     Checking solution-generics v0.1.0 (/opt/rustwide/workdir/04-generics-traits/solution)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> 04-generics-traits/solution/src/main.rs:21:10
[INFO] [stdout]    |
[INFO] [stdout] 21 |         };
[INFO] [stdout]    |          ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> 04-generics-traits/solution/src/main.rs:39:10
[INFO] [stdout]    |
[INFO] [stdout] 39 |         };
[INFO] [stdout]    |          ^ help: remove this semicolon
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::process`
[INFO] [stdout]  --> 05-match-result/demo/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::process;
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking demo v0.1.0 (/opt/rustwide/workdir/02-basics/demo)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]  --> 05-match-result/demo/src/main.rs:7:6
[INFO] [stdout]   |
[INFO] [stdout] 7 |     };
[INFO] [stdout]   |      ^ help: remove this semicolon
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: irrefutable `if let` pattern
[INFO] [stdout]    --> 05-match-result/demo/src/main.rs:104:5
[INFO] [stdout]     |
[INFO] [stdout] 104 | /     if let x = Some(wrapper) {
[INFO] [stdout] 105 | |         dbg!(x);
[INFO] [stdout] 106 | |     }
[INFO] [stdout]     | |_____^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(irrefutable_let_patterns)]` on by default
[INFO] [stdout]     = note: this pattern will always match, so the `if let` is useless
[INFO] [stdout]     = help: consider replacing the `if let` with a `let`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected one of `!` or `::`, found `:`
[INFO] [stdout]   --> 07-external-libraries/exercise/src/main.rs:21:6
[INFO] [stdout]    |
[INFO] [stdout] 21 | https://docs.serde.rs/serde_json/#parsing-json-as-strongly-typed-data-structures
[INFO] [stdout]    |      ^ expected one of `!` or `::`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercise-libraries`
[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] warning: unused variable: `x`
[INFO] [stdout]   --> 02-basics/exercise/src/main.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |     let x: u8 = 1;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]  --> 03-structs-lifetimes/exercise/src/shapes/circle.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     use super::*;
[INFO] [stdout]   |         ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> 03-structs-lifetimes/exercise/src/shapes/rectangle.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `super::*`
[INFO] [stdout]   --> 03-structs-lifetimes/exercise/src/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     use super::*;
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `xs`
[INFO] [stdout]   --> 02-basics/exercise/src/main.rs:28:9
[INFO] [stdout]    |
[INFO] [stdout] 28 |     let xs = [1, 2, 3, 4, 5];
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_xs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mutability`
[INFO] [stdout]  --> 02-basics/exercise/src/main.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn mutability() -> u8 {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `casting`
[INFO] [stdout]   --> 02-basics/exercise/src/main.rs:15:4
[INFO] [stdout]    |
[INFO] [stdout] 15 | fn casting() -> f64 {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `collections`
[INFO] [stdout]   --> 02-basics/exercise/src/main.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn collections() -> u8 {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> 06-strings/demo/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2: String = String::from_str(s).unwrap(); // s could be invalid bytes for a String
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> 06-strings/demo/src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let s2: String = s.to_owned();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> 06-strings/demo/src/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let s3: &str = s2.as_str();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0560]: struct `Rectangle` has no field named `height`
[INFO] [stdout]  --> 03-structs-lifetimes/exercise/src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |         height: 3.0f64,
[INFO] [stdout]   |         ^^^^^^ `Rectangle` does not have this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> 06-strings/demo/src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s2: String = String::from_str(s).unwrap(); // s could be invalid bytes for a String
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s2`
[INFO] [stdout]  --> 06-strings/demo/src/main.rs:8:9
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let s2: String = s.to_owned();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]   --> 06-strings/demo/src/main.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let s3: &str = s2.as_str();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0624]: associated function `area` is private
[INFO] [stdout]   --> 03-structs-lifetimes/exercise/src/main.rs:10:56
[INFO] [stdout]    |
[INFO] [stdout] 10 |     println!("Area of a 2 x 3 rectangle is {:?}", rect.area());
[INFO] [stdout]    |                                                        ^^^^ private associated function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0560]: struct `Circle` has no field named `radius`
[INFO] [stdout]   --> 03-structs-lifetimes/exercise/src/main.rs:12:25
[INFO] [stdout]    |
[INFO] [stdout] 12 |     let circ = Circle { radius: 1.0f64 };
[INFO] [stdout]    |                         ^^^^^^ `Circle` does not have this field
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `area` found for struct `Circle` in the current scope
[INFO] [stdout]   --> 03-structs-lifetimes/exercise/src/main.rs:13:52
[INFO] [stdout]    |
[INFO] [stdout] 13 |     println!("Area of a unit circle is {:?}", circ.area());
[INFO] [stdout]    |                                                    ^^^^ method not found in `Circle`
[INFO] [stdout]    | 
[INFO] [stdout]   ::: 03-structs-lifetimes/exercise/src/shapes/circle.rs:5:1
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub struct Circle {}
[INFO] [stdout]    | ----------------- method `area` not found for this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0609]: no field `height` on type `&Rectangle`
[INFO] [stdout]  --> 03-structs-lifetimes/exercise/src/shapes/rectangle.rs:7:27
[INFO] [stdout]   |
[INFO] [stdout] 7 |         self.width * self.height
[INFO] [stdout]   |                           ^^^^^^ unknown field
[INFO] [stdout]   |
[INFO] [stdout]   = note: available fields are: `width`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 5 previous errors; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0560, E0599, E0609, E0624.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0560`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d5cb617caf6a614507dba51498be986cfa6c7a9a95bb7dd001eda0bd4de50bbb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5cb617caf6a614507dba51498be986cfa6c7a9a95bb7dd001eda0bd4de50bbb", kill_on_drop: false }`
[INFO] [stdout] d5cb617caf6a614507dba51498be986cfa6c7a9a95bb7dd001eda0bd4de50bbb