[INFO] cloning repository https://github.com/7--/rustlings
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/7--/rustlings" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F7--%2Frustlings", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F7--%2Frustlings'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] daa83fee1f3f478bc52f038d0da893b8b747348f
[INFO] checking 7--/rustlings against master#36b21637e93b038453924d3c66821089e71d8baa for pr-143164
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2F7--%2Frustlings" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/7--/rustlings
[INFO] finished tweaking git repo https://github.com/7--/rustlings
[INFO] tweaked toml for git repo https://github.com/7--/rustlings written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/7--/rustlings on toolchain 36b21637e93b038453924d3c66821089e71d8baa
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/7--/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" "+36b21637e93b038453924d3c66821089e71d8baa" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded predicates-core v1.0.2
[INFO] [stderr]   Downloaded toml v0.5.9
[INFO] [stderr]   Downloaded float-cmp v0.8.0
[INFO] [stderr]   Downloaded memchr v2.4.1
[INFO] [stderr]   Downloaded argh_shared v0.1.5
[INFO] [stderr]   Downloaded glob v0.3.0
[INFO] [stderr]   Downloaded terminal_size v0.1.17
[INFO] [stderr]   Downloaded unicode-width v0.1.8
[INFO] [stderr]   Downloaded argh_derive v0.1.5
[INFO] [stderr]   Downloaded walkdir v2.3.2
[INFO] [stderr]   Downloaded notify v4.0.17
[INFO] [stderr]   Downloaded unicode-segmentation v1.8.0
[INFO] [stderr]   Downloaded serde_json v1.0.66
[INFO] [stderr]   Downloaded serde v1.0.129
[INFO] [stderr]   Downloaded proc-macro2 v1.0.28
[INFO] [stderr]   Downloaded serde_derive v1.0.129
[INFO] [stderr]   Downloaded escargot v0.4.0
[INFO] [stderr]   Downloaded once_cell v1.10.0
[INFO] [stderr]   Downloaded indicatif v0.16.2
[INFO] [stderr]   Downloaded inotify v0.7.1
[INFO] [stderr]   Downloaded syn v1.0.75
[INFO] [stderr]   Downloaded predicates v1.0.8
[INFO] [stderr]   Downloaded console v0.15.0
[INFO] [stderr]   Downloaded redox_syscall v0.2.10
[INFO] [stderr]   Downloaded filetime v0.2.15
[INFO] [stderr]   Downloaded slab v0.4.4
[INFO] [stderr]   Downloaded argh v0.1.5
[INFO] [stderr]   Downloaded treeline v0.1.0
[INFO] [stderr]   Downloaded predicates-tree v1.0.3
[INFO] [stderr]   Downloaded assert_cmd v0.11.1
[INFO] [stderr]   Downloaded number_prefix v0.4.0
[INFO] [stderr]   Downloaded fsevent v0.4.0
[INFO] [stderr]   Downloaded fsevent-sys v2.0.1
[INFO] [stderr]   Downloaded libc v0.2.100
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d2740365c5de2d8279012a7276bb9c7c509f00d2c2a78a4b105a05bfd1945ace
[INFO] running `Command { std: "docker" "start" "-a" "d2740365c5de2d8279012a7276bb9c7c509f00d2c2a78a4b105a05bfd1945ace", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2740365c5de2d8279012a7276bb9c7c509f00d2c2a78a4b105a05bfd1945ace", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2740365c5de2d8279012a7276bb9c7c509f00d2c2a78a4b105a05bfd1945ace", kill_on_drop: false }`
[INFO] [stdout] d2740365c5de2d8279012a7276bb9c7c509f00d2c2a78a4b105a05bfd1945ace
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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:cf8efcab8866f2cf4285301c7418e2f4f2a9b088c91ba69c40d5b659f81557f7" "/opt/rustwide/cargo-home/bin/cargo" "+36b21637e93b038453924d3c66821089e71d8baa" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57d3c9b7587376df22a8b2ca16f3e530c7bfc9f8aedeb5bed7b7b210853b0930
[INFO] running `Command { std: "docker" "start" "-a" "57d3c9b7587376df22a8b2ca16f3e530c7bfc9f8aedeb5bed7b7b210853b0930", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.100
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling serde_derive v1.0.129
[INFO] [stderr]    Compiling serde v1.0.129
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]     Checking slab v0.4.4
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]    Compiling argh_shared v0.1.5
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking once_cell v1.10.0
[INFO] [stderr]     Checking lazycell v1.3.0
[INFO] [stderr]     Checking walkdir v2.3.2
[INFO] [stderr]     Checking predicates-core v1.0.2
[INFO] [stderr]     Checking number_prefix v0.4.0
[INFO] [stderr]    Compiling escargot v0.4.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking treeline v0.1.0
[INFO] [stderr]     Checking normalize-line-endings v0.3.0
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]     Checking glob v0.3.0
[INFO] [stderr]     Checking predicates-tree v1.0.3
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking net2 v0.2.37
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]     Checking terminal_size v0.1.17
[INFO] [stderr]     Checking inotify-sys v0.1.5
[INFO] [stderr]     Checking filetime v0.2.15
[INFO] [stderr]     Checking inotify v0.7.1
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking float-cmp v0.8.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking mio-extras v2.0.6
[INFO] [stderr]     Checking notify v4.0.17
[INFO] [stderr]     Checking console v0.15.0
[INFO] [stderr]     Checking predicates v1.0.8
[INFO] [stderr]     Checking indicatif v0.16.2
[INFO] [stderr]    Compiling argh_derive v0.1.5
[INFO] [stderr]     Checking argh v0.1.5
[INFO] [stderr]     Checking toml v0.5.9
[INFO] [stderr]     Checking rustlings v4.7.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking assert_cmd v0.11.1
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/exercise.rs:109:20
[INFO] [stdout]     |
[INFO] [stdout] 109 |     pub fn compile(&self) -> Result<CompiledExercise, ExerciseOutput> {
[INFO] [stdout]     |                    ^^^^^            ---------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 109 |     pub fn compile(&self) -> Result<CompiledExercise<'_>, ExerciseOutput> {
[INFO] [stdout]     |                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/exercise.rs:109:20
[INFO] [stdout]     |
[INFO] [stdout] 109 |     pub fn compile(&self) -> Result<CompiledExercise, ExerciseOutput> {
[INFO] [stdout]     |                    ^^^^^            ---------------- the lifetime gets resolved as `'_`
[INFO] [stdout]     |                    |
[INFO] [stdout]     |                    this lifetime flows to the output
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
[INFO] [stdout]     |
[INFO] [stdout] 109 |     pub fn compile(&self) -> Result<CompiledExercise<'_>, ExerciseOutput> {
[INFO] [stdout]     |                                                     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.84s
[INFO] running `Command { std: "docker" "inspect" "57d3c9b7587376df22a8b2ca16f3e530c7bfc9f8aedeb5bed7b7b210853b0930", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57d3c9b7587376df22a8b2ca16f3e530c7bfc9f8aedeb5bed7b7b210853b0930", kill_on_drop: false }`
[INFO] [stdout] 57d3c9b7587376df22a8b2ca16f3e530c7bfc9f8aedeb5bed7b7b210853b0930
