[INFO] cloning repository https://github.com/KowalskiThomas/RustChallenges
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KowalskiThomas/RustChallenges" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKowalskiThomas%2FRustChallenges", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKowalskiThomas%2FRustChallenges'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 75e8fbd48884254d5b4fa2c7bbe7cb4803167993
[INFO] checking KowalskiThomas/RustChallenges against 416264364aa47959f5827723e1d7dabc95d0744b for pr-162242
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKowalskiThomas%2FRustChallenges" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/KowalskiThomas/RustChallenges
[INFO] finished tweaking git repo https://github.com/KowalskiThomas/RustChallenges
[INFO] tweaked toml for git repo https://github.com/KowalskiThomas/RustChallenges written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/KowalskiThomas/RustChallenges on toolchain 416264364aa47959f5827723e1d7dabc95d0744b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+416264364aa47959f5827723e1d7dabc95d0744b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/KowalskiThomas/RustChallenges 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" "+416264364aa47959f5827723e1d7dabc95d0744b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr] warning: binary `broadcast_2` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-6-tc2/source/target/.../broadcast_2
[INFO] [stderr]   |                                                  ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::non_kebab_case_bins` is set to `warn` by default
[INFO] [stderr] help: to change the binary name to `broadcast-2`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/broadcast_2.rs
[INFO] [stderr] 1 + src/bin/broadcast-2.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `unique_id` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-6-tc2/source/target/.../unique_id
[INFO] [stderr]   |                                                  ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `unique-id`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/unique_id.rs
[INFO] [stderr] 1 + src/bin/unique-id.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: `distributed_challenges` (manifest) generated 2 warnings
[INFO] [stderr] warning: binary `broadcast_1_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-6-tc2/source/target/.../broadcast_1_solution
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::non_kebab_case_bins` is set to `warn` by default
[INFO] [stderr] help: to change the binary name to `broadcast-1-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/broadcast_1_solution.rs
[INFO] [stderr] 1 + src/bin/broadcast-1-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `broadcast_2_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-6-tc2/source/target/.../broadcast_2_solution
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `broadcast-2-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/broadcast_2_solution.rs
[INFO] [stderr] 1 + src/bin/broadcast-2-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `echo_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-6-tc2/source/target/.../echo_solution
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `echo-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/echo_solution.rs
[INFO] [stderr] 1 + src/bin/echo-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `unique_id_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /workspace/builds/worker-6-tc2/source/target/.../unique_id_solution
[INFO] [stderr]   |                                                  ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `unique-id-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/unique_id_solution.rs
[INFO] [stderr] 1 + src/bin/unique-id-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: `distributed_challenges_solution` (manifest) generated 4 warnings
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded uuid v1.3.1
[INFO] [stderr]   Downloaded serde_derive v1.0.160
[INFO] [stderr]   Downloaded syn v2.0.14
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905
[INFO] running `Command { std: "docker" "start" "aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905" "/opt/rustwide/cargo-home/bin/cargo" "+416264364aa47959f5827723e1d7dabc95d0744b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905" "/opt/rustwide/cargo-home/bin/cargo" "+416264364aa47959f5827723e1d7dabc95d0744b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr] warning: binary `broadcast_2` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../broadcast_2
[INFO] [stderr]   |                          ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::non_kebab_case_bins` is set to `warn` by default
[INFO] [stderr] help: to change the binary name to `broadcast-2`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/broadcast_2.rs
[INFO] [stderr] 1 + src/bin/broadcast-2.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `unique_id` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../unique_id
[INFO] [stderr]   |                          ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `unique-id`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/unique_id.rs
[INFO] [stderr] 1 + src/bin/unique-id.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: `distributed_challenges` (manifest) generated 2 warnings
[INFO] [stderr] warning: binary `broadcast_1_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../broadcast_1_solution
[INFO] [stderr]   |                          ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::non_kebab_case_bins` is set to `warn` by default
[INFO] [stderr] help: to change the binary name to `broadcast-1-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/broadcast_1_solution.rs
[INFO] [stderr] 1 + src/bin/broadcast-1-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `broadcast_2_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../broadcast_2_solution
[INFO] [stderr]   |                          ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `broadcast-2-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/broadcast_2_solution.rs
[INFO] [stderr] 1 + src/bin/broadcast-2-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `echo_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../echo_solution
[INFO] [stderr]   |                          ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `echo-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/echo_solution.rs
[INFO] [stderr] 1 + src/bin/echo-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: binary `unique_id_solution` should have a kebab-case name
[INFO] [stderr]   |
[INFO] [stderr] 1 | /opt/rustwide/target/.../unique_id_solution
[INFO] [stderr]   |                          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr] help: to change the binary name to `unique-id-solution`, convert the file stem
[INFO] [stderr]   |
[INFO] [stderr] 1 - src/bin/unique_id_solution.rs
[INFO] [stderr] 1 + src/bin/unique-id-solution.rs
[INFO] [stderr]   |
[INFO] [stderr] warning: `distributed_challenges_solution` (manifest) generated 4 warnings
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling quote v1.0.26
[INFO] [stderr]    Compiling serde_derive v1.0.160
[INFO] [stderr]    Compiling serde v1.0.160
[INFO] [stderr]    Compiling serde_json v1.0.95
[INFO] [stderr]    Compiling anyhow v1.0.70
[INFO] [stderr]    Compiling libc v0.2.141
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.56/src/lib.rs:92:30
[INFO] [stdout]    |
[INFO] [stdout] 92 |     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a feature with a similar name: `proc_macro_span_file`
[INFO] [stdout]    |
[INFO] [stdout] 92 -     feature(proc_macro_span, proc_macro_span_shrink)
[INFO] [stdout] 92 +     feature(proc_macro_span, proc_macro_span_file)
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `proc-macro2` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905", kill_on_drop: false }`
[INFO] [stdout] aba35dde6ae7677cf28f7fdcad0caf0f19923f004352c63b794b83c15751f905
