[INFO] cloning repository https://github.com/Allstreamer/maelstrom_echo
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Allstreamer/maelstrom_echo" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAllstreamer%2Fmaelstrom_echo", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAllstreamer%2Fmaelstrom_echo'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d5422e64e3685c751fe29449a7707edeb027a80d
[INFO] checking Allstreamer/maelstrom_echo against try#5fee451ebd94296ea05214e819c311e164b30af6 for pr-139042
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAllstreamer%2Fmaelstrom_echo" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Allstreamer/maelstrom_echo on toolchain 5fee451ebd94296ea05214e819c311e164b30af6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5fee451ebd94296ea05214e819c311e164b30af6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Allstreamer/maelstrom_echo
[INFO] finished tweaking git repo https://github.com/Allstreamer/maelstrom_echo
[INFO] tweaked toml for git repo https://github.com/Allstreamer/maelstrom_echo written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Allstreamer/maelstrom_echo 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" "+5fee451ebd94296ea05214e819c311e164b30af6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+5fee451ebd94296ea05214e819c311e164b30af6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9ccfd0eb402a01228e354c9929ec26ba0d85aad881510c608cffe3d1ca73f040
[INFO] running `Command { std: "docker" "start" "-a" "9ccfd0eb402a01228e354c9929ec26ba0d85aad881510c608cffe3d1ca73f040", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ccfd0eb402a01228e354c9929ec26ba0d85aad881510c608cffe3d1ca73f040", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ccfd0eb402a01228e354c9929ec26ba0d85aad881510c608cffe3d1ca73f040", kill_on_drop: false }`
[INFO] [stdout] 9ccfd0eb402a01228e354c9929ec26ba0d85aad881510c608cffe3d1ca73f040
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+5fee451ebd94296ea05214e819c311e164b30af6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f5fff2704d37500b13d7869def05d2ab117c3057a4c16332f32f2ff49d839cbd
[INFO] running `Command { std: "docker" "start" "-a" "f5fff2704d37500b13d7869def05d2ab117c3057a4c16332f32f2ff49d839cbd", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.56
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling quote v1.0.26
[INFO] [stderr]     Checking once_cell v1.17.1
[INFO] [stderr]    Compiling libc v0.2.141
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]    Compiling cc v1.0.79
[INFO] [stderr]    Compiling serde_derive v1.0.159
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling serde v1.0.159
[INFO] [stderr]    Compiling eyre v0.6.8
[INFO] [stderr]     Checking gimli v0.27.2
[INFO] [stderr]    Compiling serde_json v1.0.95
[INFO] [stderr]     Checking indenter v0.3.3
[INFO] [stderr]     Checking sharded-slab v0.1.4
[INFO] [stderr]     Checking owo-colors v3.5.0
[INFO] [stderr]     Checking rustc-demangle v0.1.22
[INFO] [stderr]     Checking miniz_oxide v0.6.2
[INFO] [stderr]     Checking tracing-core v0.1.30
[INFO] [stderr]     Checking thread_local v1.1.7
[INFO] [stderr]     Checking ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling thiserror v1.0.40
[INFO] [stderr]     Checking itoa v1.0.6
[INFO] [stderr]     Checking ryu v1.0.13
[INFO] [stderr]     Checking tracing v0.1.37
[INFO] [stderr]     Checking text_io v0.1.12
[INFO] [stderr]     Checking object v0.30.3
[INFO] [stderr]     Checking tracing-subscriber v0.3.16
[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] 
[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" "f5fff2704d37500b13d7869def05d2ab117c3057a4c16332f32f2ff49d839cbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5fff2704d37500b13d7869def05d2ab117c3057a4c16332f32f2ff49d839cbd", kill_on_drop: false }`
[INFO] [stdout] f5fff2704d37500b13d7869def05d2ab117c3057a4c16332f32f2ff49d839cbd
