[INFO] fetching crate mdrend-test-markdown-123 0.1.0...
[INFO] checking mdrend-test-markdown-123-0.1.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate mdrend-test-markdown-123 0.1.0 into /workspace/builds/worker-94/source
[INFO] validating manifest of crates.io crate mdrend-test-markdown-123 0.1.0 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mdrend-test-markdown-123 0.1.0
[INFO] finished tweaking crates.io crate mdrend-test-markdown-123 0.1.0
[INFO] tweaked toml for crates.io crate mdrend-test-markdown-123 0.1.0 written to /workspace/builds/worker-94/source/Cargo.toml
[INFO] crate crates.io crate mdrend-test-markdown-123 0.1.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded memchr v2.3.0
[INFO] [stderr]   Downloaded pulldown-cmark v0.4.1
[INFO] [stderr]   Downloaded hermit-abi v0.1.6
[INFO] [stderr]   Downloaded maud v0.20.0
[INFO] [stderr]   Downloaded literalext v0.1.1
[INFO] [stderr]   Downloaded maud_macros v0.20.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-94/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-94/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e06861a4c12311dd2de728a4828a5de46c6b310d2178ed9a50a548883c8b34d7
[INFO] running `Command { std: "docker" "start" "-a" "e06861a4c12311dd2de728a4828a5de46c6b310d2178ed9a50a548883c8b34d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e06861a4c12311dd2de728a4828a5de46c6b310d2178ed9a50a548883c8b34d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e06861a4c12311dd2de728a4828a5de46c6b310d2178ed9a50a548883c8b34d7", kill_on_drop: false }`
[INFO] [stdout] e06861a4c12311dd2de728a4828a5de46c6b310d2178ed9a50a548883c8b34d7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-94/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-94/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0248d749207dd082a4b37b6c7274a115e0c65c6e67b2e90b970d96527e8730da
[INFO] running `Command { std: "docker" "start" "-a" "0248d749207dd082a4b37b6c7274a115e0c65c6e67b2e90b970d96527e8730da", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]    Compiling version_check v0.9.1
[INFO] [stderr]    Compiling memchr v2.3.0
[INFO] [stderr]    Compiling matches v0.1.8
[INFO] [stderr]    Compiling pulldown-cmark v0.4.1
[INFO] [stderr]    Compiling literalext v0.1.1
[INFO] [stderr]    Compiling maud_htmlescape v0.17.0
[INFO] [stderr]     Checking vec_map v0.8.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/literalext-0.1.1/src/lib.rs:19:37
[INFO] [stdout]    |
[INFO] [stdout] 19 | #![cfg_attr(feature = "proc-macro", feature(proc_macro))]
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `proc_macro` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `literalext` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "0248d749207dd082a4b37b6c7274a115e0c65c6e67b2e90b970d96527e8730da", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0248d749207dd082a4b37b6c7274a115e0c65c6e67b2e90b970d96527e8730da", kill_on_drop: false }`
[INFO] [stdout] 0248d749207dd082a4b37b6c7274a115e0c65c6e67b2e90b970d96527e8730da
