[INFO] cloning repository https://github.com/whoisryosuke/rust-markdown-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/whoisryosuke/rust-markdown-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwhoisryosuke%2Frust-markdown-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwhoisryosuke%2Frust-markdown-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4c5d4e7a0f66c08310f621d70c46b89abb324f2f
[INFO] checking whoisryosuke/rust-markdown-playground against try#84addd32a13fa2d3f62fe5d99031611147b7fb13 for pr-147565
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwhoisryosuke%2Frust-markdown-playground" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/whoisryosuke/rust-markdown-playground
[INFO] finished tweaking git repo https://github.com/whoisryosuke/rust-markdown-playground
[INFO] tweaked toml for git repo https://github.com/whoisryosuke/rust-markdown-playground written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/whoisryosuke/rust-markdown-playground on toolchain 84addd32a13fa2d3f62fe5d99031611147b7fb13
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+84addd32a13fa2d3f62fe5d99031611147b7fb13" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/whoisryosuke/rust-markdown-playground 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" "+84addd32a13fa2d3f62fe5d99031611147b7fb13" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded xdg v2.4.1
[INFO] [stderr]   Downloaded walkdir v2.3.2
[INFO] [stderr]   Downloaded itoa v1.0.3
[INFO] [stderr]   Downloaded pest_meta v2.4.0
[INFO] [stderr]   Downloaded pest_generator v2.4.0
[INFO] [stderr]   Downloaded digest v0.10.5
[INFO] [stderr]   Downloaded pest_derive v2.4.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.46
[INFO] [stderr]   Downloaded plist v1.3.1
[INFO] [stderr]   Downloaded ucd-trie v0.1.5
[INFO] [stderr]   Downloaded fancy-regex v0.7.1
[INFO] [stderr]   Downloaded pest v2.4.0
[INFO] [stderr]   Downloaded comrak v0.14.0
[INFO] [stderr]   Downloaded time v0.3.14
[INFO] [stderr]   Downloaded serde_json v1.0.85
[INFO] [stderr]   Downloaded syn v1.0.101
[INFO] [stderr]   Downloaded libc v0.2.134
[INFO] [stderr]   Downloaded syntect v4.6.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+84addd32a13fa2d3f62fe5d99031611147b7fb13" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4de8f99aa2376fbc6b2373dbcea3a93b813eb9e81303f9cdf6dcccb54d2e596b
[INFO] running `Command { std: "docker" "start" "-a" "4de8f99aa2376fbc6b2373dbcea3a93b813eb9e81303f9cdf6dcccb54d2e596b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4de8f99aa2376fbc6b2373dbcea3a93b813eb9e81303f9cdf6dcccb54d2e596b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4de8f99aa2376fbc6b2373dbcea3a93b813eb9e81303f9cdf6dcccb54d2e596b", kill_on_drop: false }`
[INFO] [stdout] 4de8f99aa2376fbc6b2373dbcea3a93b813eb9e81303f9cdf6dcccb54d2e596b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+84addd32a13fa2d3f62fe5d99031611147b7fb13" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 081fc15ce303d4ed2005d2d97dda93a5a97c3401ce45a87e0430f5ecdec3f2da
[INFO] running `Command { std: "docker" "start" "-a" "081fc15ce303d4ed2005d2d97dda93a5a97c3401ce45a87e0430f5ecdec3f2da", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.46
[INFO] [stderr]    Compiling syn v1.0.101
[INFO] [stderr]    Compiling libc v0.2.134
[INFO] [stderr]    Compiling thiserror v1.0.37
[INFO] [stderr]    Compiling serde v1.0.145
[INFO] [stderr]    Compiling onig_sys v69.8.1
[INFO] [stderr]     Checking itoa v1.0.3
[INFO] [stderr]    Compiling ucd-trie v0.1.5
[INFO] [stderr]    Compiling indexmap v1.9.1
[INFO] [stderr]     Checking hashbrown v0.12.3
[INFO] [stderr]    Compiling serde_json v1.0.85
[INFO] [stderr]    Compiling serde_derive v1.0.145
[INFO] [stderr]     Checking safemem v0.3.3
[INFO] [stderr]     Checking num_threads v0.1.6
[INFO] [stderr]    Compiling once_cell v1.15.0
[INFO] [stdout] error[E0635]: unknown feature `proc_macro_span_shrink`
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/proc-macro2-1.0.46/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] [stderr]     Checking crc32fast v1.3.2
[INFO] [stderr]     Checking miniz_oxide v0.5.4
[INFO] [stderr]     Checking line-wrap v0.1.1
[INFO] [stderr]     Checking base64 v0.13.0
[INFO] [stdout] For more information about this error, try `rustc --explain E0635`.
[INFO] [stdout] 
[INFO] [stderr]     Checking unicode-width v0.1.10
[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" "081fc15ce303d4ed2005d2d97dda93a5a97c3401ce45a87e0430f5ecdec3f2da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "081fc15ce303d4ed2005d2d97dda93a5a97c3401ce45a87e0430f5ecdec3f2da", kill_on_drop: false }`
[INFO] [stdout] 081fc15ce303d4ed2005d2d97dda93a5a97c3401ce45a87e0430f5ecdec3f2da