[INFO] cloning repository https://github.com/jjjike2021/exercises-to-learn-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jjjike2021/exercises-to-learn-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjjjike2021%2Fexercises-to-learn-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjjjike2021%2Fexercises-to-learn-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ec1a66409e4a4fa08c1635d09a2dfb2d3df348f5
[INFO] testing jjjike2021/exercises-to-learn-rust against try#0abe69e6c16114311cc2700e972492e64d69c28f for pr-154065-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjjjike2021%2Fexercises-to-learn-rust" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/jjjike2021/exercises-to-learn-rust
[INFO] finished tweaking git repo https://github.com/jjjike2021/exercises-to-learn-rust
[INFO] tweaked toml for git repo https://github.com/jjjike2021/exercises-to-learn-rust written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/jjjike2021/exercises-to-learn-rust on toolchain 0abe69e6c16114311cc2700e972492e64d69c28f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/jjjike2021/exercises-to-learn-rust 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" "+0abe69e6c16114311cc2700e972492e64d69c28f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "inspect" "8e6a474cbcd9894a408396d5bcbda0c0e45e8a924eb2e27ffc766c7a51b26b6b", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+0abe69e6c16114311cc2700e972492e64d69c28f" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c11ba2b1f54746fb46656acf24277325b8c2b28be46ce99379cc530e4d768b0
[INFO] running `Command { std: "docker" "start" "-a" "4c11ba2b1f54746fb46656acf24277325b8c2b28be46ce99379cc530e4d768b0", kill_on_drop: false }`
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[INFO] [stdout] warning: unused variable: `v`
[INFO] [stdout]  --> exercises/07_threads/04_scoped_threads/src/lib.rs:5:12
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub fn sum(v: Vec<i32>) -> i32 {
[INFO] [stdout]   |            ^ help: if this is intentional, prefix it with an underscore: `_v`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
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[INFO] [stderr]    Compiling from v0.1.0 (/opt/rustwide/workdir/exercises/04_traits/09_from)
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[INFO] [stderr]    Compiling phf_generator v0.10.0
[INFO] [stderr]    Compiling str_slice v0.1.0 (/opt/rustwide/workdir/exercises/04_traits/06_str_slice)
[INFO] [stderr]    Compiling string_cache_codegen v0.5.2
[INFO] [stderr]    Compiling syntax v0.1.0 (/opt/rustwide/workdir/exercises/01_intro/01_syntax)
[INFO] [stderr]    Compiling intro_03 v0.1.0 (/opt/rustwide/workdir/exercises/04_traits/00_intro)
[INFO] [stderr]    Compiling phf_codegen v0.11.2
[INFO] [stdout] error[E0277]: the trait bound `WrappingU32: From<{integer}>` is not satisfied
[INFO] [stdout]  --> exercises/04_traits/09_from/src/lib.rs:8:36
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let wrapping: WrappingU32 = 42.into();
[INFO] [stdout]   |                                    ^^^^ unsatisfied trait bound
[INFO] [stdout]   |
[INFO] [stdout] help: the trait `From<{integer}>` is not implemented for `WrappingU32`
[INFO] [stdout]  --> exercises/04_traits/09_from/src/lib.rs:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | pub struct WrappingU32 {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   = note: required for `{integer}` to implement `Into<WrappingU32>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]  --> exercises/04_traits/09_from/src/lib.rs:9:38
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let wrapping = WrappingU32::from(42);
[INFO] [stdout]   |                    ----------------- ^^ expected `WrappingU32`, found integer
[INFO] [stdout]   |                    |
[INFO] [stdout]   |                    arguments to this function are incorrect
[INFO] [stdout]   |
[INFO] [stdout] note: associated function defined here
[INFO] [stdout]  --> /rustc/0abe69e6c16114311cc2700e972492e64d69c28f/library/core/src/convert/mod.rs:592:7
[INFO] [stdout] help: try wrapping the expression in `WrappingU32`
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let wrapping = WrappingU32::from(WrappingU32 { value: 42 });
[INFO] [stdout]   |                                      ++++++++++++++++++++    +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `from` (lib) due to 2 previous errors
[INFO] [stdout] Some errors have detailed explanations: E0277, E0308.
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] warning: function `compute` is never used
[INFO] [stdout]  --> exercises/01_intro/01_syntax/src/lib.rs:6:4
[INFO] [stdout]   |
[INFO] [stdout] 6 | fn compute(a: u32, b: u32) -> u32 {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `intro` is never used
[INFO] [stdout]  --> exercises/04_traits/00_intro/src/lib.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn intro() -> &'static str {
[INFO] [stdout]   |    ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4c11ba2b1f54746fb46656acf24277325b8c2b28be46ce99379cc530e4d768b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c11ba2b1f54746fb46656acf24277325b8c2b28be46ce99379cc530e4d768b0", kill_on_drop: false }`
[INFO] [stdout] 4c11ba2b1f54746fb46656acf24277325b8c2b28be46ce99379cc530e4d768b0