[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 try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjeraldgan%2Frust-primer" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jeraldgan/rust-primer on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "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-2/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" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c989a10a55e58d774692ee392921b3d77eabb17d23be4f53ead7a87aef5b9a03
[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" "c989a10a55e58d774692ee392921b3d77eabb17d23be4f53ead7a87aef5b9a03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c989a10a55e58d774692ee392921b3d77eabb17d23be4f53ead7a87aef5b9a03", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c989a10a55e58d774692ee392921b3d77eabb17d23be4f53ead7a87aef5b9a03", kill_on_drop: false }`
[INFO] [stdout] c989a10a55e58d774692ee392921b3d77eabb17d23be4f53ead7a87aef5b9a03
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c88eb992978012444e4038e94bf2460bec0c8ed66f1dcf798918e12f68d64cc1
[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" "c88eb992978012444e4038e94bf2460bec0c8ed66f1dcf798918e12f68d64cc1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.65
[INFO] [stderr]    Compiling libc v0.2.91
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling serde_derive v1.0.125
[INFO] [stderr]    Compiling unicode-segmentation v1.7.1
[INFO] [stderr]    Compiling serde v1.0.125
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking demo-structs v0.1.0 (/opt/rustwide/workdir/03-structs-lifetimes/demo)
[INFO] [stderr]     Checking demo v0.1.0 (/opt/rustwide/workdir/02-basics/demo)
[INFO] [stderr]     Checking demo-match v0.1.0 (/opt/rustwide/workdir/05-match-result/demo)
[INFO] [stderr]     Checking solution-structs v0.1.0 (/opt/rustwide/workdir/03-structs-lifetimes/solution)
[INFO] [stderr]     Checking solution-generics v0.1.0 (/opt/rustwide/workdir/04-generics-traits/solution)
[INFO] [stderr]     Checking exercise-libraries v0.1.0 (/opt/rustwide/workdir/07-external-libraries/exercise)
[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] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> 03-structs-lifetimes/demo/src/main.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 18 |     fn new(width: u32, height: u32) -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `double_area_rect_reference`
[INFO] [stdout]   --> 03-structs-lifetimes/demo/src/main.rs:73:4
[INFO] [stdout]    |
[INFO] [stdout] 73 | fn double_area_rect_reference(rect: &Rectangle) -> u32 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^
[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: 2 warnings emitted
[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] [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] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> 04-generics-traits/solution/src/main.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     use std::collections::HashMap;
[INFO] [stdout]   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[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" "c88eb992978012444e4038e94bf2460bec0c8ed66f1dcf798918e12f68d64cc1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c88eb992978012444e4038e94bf2460bec0c8ed66f1dcf798918e12f68d64cc1", kill_on_drop: false }`
[INFO] [stdout] c88eb992978012444e4038e94bf2460bec0c8ed66f1dcf798918e12f68d64cc1