[INFO] cloning repository https://github.com/zcxGGmu/rustlings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/zcxGGmu/rustlings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FzcxGGmu%2Frustlings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FzcxGGmu%2Frustlings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b6d2072632025a4243580232fcda4821e1631105
[INFO] checking zcxGGmu/rustlings against try#9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869 for pr-129249
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FzcxGGmu%2Frustlings" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
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[INFO] validating manifest of git repo https://github.com/zcxGGmu/rustlings on toolchain 9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/zcxGGmu/rustlings
[INFO] finished tweaking git repo https://github.com/zcxGGmu/rustlings
[INFO] tweaked toml for git repo https://github.com/zcxGGmu/rustlings written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/zcxGGmu/rustlings 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" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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_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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a48b196f20e215ac050ecbdd3e836a2c69f970f5b74bcdceec9fa038e4b547e3
[INFO] running `Command { std: "docker" "start" "-a" "a48b196f20e215ac050ecbdd3e836a2c69f970f5b74bcdceec9fa038e4b547e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a48b196f20e215ac050ecbdd3e836a2c69f970f5b74bcdceec9fa038e4b547e3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a48b196f20e215ac050ecbdd3e836a2c69f970f5b74bcdceec9fa038e4b547e3", kill_on_drop: false }`
[INFO] [stdout] a48b196f20e215ac050ecbdd3e836a2c69f970f5b74bcdceec9fa038e4b547e3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+9543f8ea2aae74b8f13ac2a6e6c0ecdca9810869" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 573cea970e5402f7354dfced8b978c9dc9da6d24a087b02bf8e90fcd6c07bba7
[INFO] running `Command { std: "docker" "start" "-a" "573cea970e5402f7354dfced8b978c9dc9da6d24a087b02bf8e90fcd6c07bba7", kill_on_drop: false }`
[INFO] [stderr]     Checking exercises v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `Licensed` is never used
[INFO] [stdout]  --> exercises/15_traits/traits4.rs:1:7
[INFO] [stdout]   |
[INFO] [stdout] 1 | trait Licensed {
[INFO] [stdout]   |       ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `SomeSoftware` is never constructed
[INFO] [stdout]  --> exercises/15_traits/traits4.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 | struct SomeSoftware;
[INFO] [stdout]   |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OtherSoftware` is never constructed
[INFO] [stdout]  --> exercises/15_traits/traits4.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 | struct OtherSoftware;
[INFO] [stdout]   |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `compare_license_types` is never used
[INFO] [stdout]   --> exercises/15_traits/traits4.rs:14:4
[INFO] [stdout]    |
[INFO] [stdout] 14 | fn compare_license_types(software1: impl Licensed, software2: impl Licensed) -> bool {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this conversion is useless `&str` to `&str`
[INFO] [stdout]   --> solutions/09_strings/strings4.rs:24:18
[INFO] [stdout]    |
[INFO] [stdout] 24 |     string_slice("nice weather".into());
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(self_type_conversion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `total_cost` is never used
[INFO] [stdout]   --> exercises/13_error_handling/errors2.rs:19:4
[INFO] [stdout]    |
[INFO] [stdout] 19 | fn total_cost(item_quantity: &str) -> Result<i32, ParseIntError> {
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exercises` (bin "strings4_sol") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: function `power_of_2` is never used
[INFO] [stdout]  --> exercises/17_tests/tests2.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn power_of_2(n: u8) -> u64 {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `details` is never used
[INFO] [stdout]   --> exercises/19_smart_pointers/rc1.rs:25:8
[INFO] [stdout]    |
[INFO] [stdout] 24 | impl Planet {
[INFO] [stdout]    | ----------- method in this implementation
[INFO] [stdout] 25 |     fn details(&self) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `os::linux::raw::stat`
[INFO] [stdout]  --> exercises/20_threads/threads2.rs:5:11
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::{os::linux::raw::stat, sync::Arc, thread, time::Duration};
[INFO] [stdout]   |           ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated struct `std::os::linux::raw::stat`: these type aliases are no longer supported by the standard library, the `libc` crate on crates.io should be used instead for the correct definitions
[INFO] [stdout]  --> exercises/20_threads/threads2.rs:5:27
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::{os::linux::raw::stat, sync::Arc, thread, time::Duration};
[INFO] [stdout]   |                           ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "573cea970e5402f7354dfced8b978c9dc9da6d24a087b02bf8e90fcd6c07bba7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "573cea970e5402f7354dfced8b978c9dc9da6d24a087b02bf8e90fcd6c07bba7", kill_on_drop: false }`
[INFO] [stdout] 573cea970e5402f7354dfced8b978c9dc9da6d24a087b02bf8e90fcd6c07bba7