[INFO] cloning repository https://github.com/artursapek/pretty-pictures
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/artursapek/pretty-pictures" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fartursapek%2Fpretty-pictures", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fartursapek%2Fpretty-pictures'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 388ae585d7820b2fbd1f285f6f64b4dd1ce150f3
[INFO] checking artursapek/pretty-pictures against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fartursapek%2Fpretty-pictures" "/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/artursapek/pretty-pictures
[INFO] finished tweaking git repo https://github.com/artursapek/pretty-pictures
[INFO] tweaked toml for git repo https://github.com/artursapek/pretty-pictures written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/artursapek/pretty-pictures on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/artursapek/pretty-pictures 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4a3f3126200816c6222410e687f7e5dcc00ece91f7a86640da46a39daa36b79e
[INFO] running `Command { std: "docker" "start" "-a" "4a3f3126200816c6222410e687f7e5dcc00ece91f7a86640da46a39daa36b79e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4a3f3126200816c6222410e687f7e5dcc00ece91f7a86640da46a39daa36b79e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4a3f3126200816c6222410e687f7e5dcc00ece91f7a86640da46a39daa36b79e", kill_on_drop: false }`
[INFO] [stdout] 4a3f3126200816c6222410e687f7e5dcc00ece91f7a86640da46a39daa36b79e
[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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 64ce57bec69eb77ef585db6288070fec1377cbf20c9d64296614f9f8c3b5b50f
[INFO] running `Command { std: "docker" "start" "-a" "64ce57bec69eb77ef585db6288070fec1377cbf20c9d64296614f9f8c3b5b50f", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling syn v1.0.107
[INFO] [stderr]    Compiling proc-macro2 v1.0.49
[INFO] [stderr]     Checking crossbeam-deque v0.8.2
[INFO] [stderr]     Checking crc32fast v1.3.2
[INFO] [stderr]     Checking lock_api v0.4.9
[INFO] [stderr]     Checking num-traits v0.2.15
[INFO] [stderr]    Compiling futures-core v0.3.25
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]     Checking flate2 v1.0.25
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.49/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" "64ce57bec69eb77ef585db6288070fec1377cbf20c9d64296614f9f8c3b5b50f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "64ce57bec69eb77ef585db6288070fec1377cbf20c9d64296614f9f8c3b5b50f", kill_on_drop: false }`
[INFO] [stdout] 64ce57bec69eb77ef585db6288070fec1377cbf20c9d64296614f9f8c3b5b50f