[INFO] fetching crate mdrend 0.1.0...
[INFO] testing mdrend-0.1.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate mdrend 0.1.0 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate mdrend 0.1.0
[INFO] finished tweaking crates.io crate mdrend 0.1.0
[INFO] tweaked toml for crates.io crate mdrend 0.1.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate mdrend 0.1.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 21 packages to latest compatible versions
[INFO] [stderr]       Adding clap v2.34.0 (available: v4.5.48)
[INFO] [stderr]       Adding maud v0.20.0 (available: v0.27.0)
[INFO] [stderr]       Adding pulldown-cmark v0.2.0 (available: v0.13.0)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded maud_htmlescape v0.17.1
[INFO] [stderr]   Downloaded literalext v0.1.1
[INFO] [stderr]   Downloaded maud_macros v0.20.0
[INFO] [stderr]   Downloaded maud v0.20.0
[INFO] [stderr]   Downloaded pulldown-cmark v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 372bf867c1fc1d83c2cd37f286f50e2f237d23864c253fecd6c8bf70e158ba5c
[INFO] running `Command { std: "docker" "start" "-a" "372bf867c1fc1d83c2cd37f286f50e2f237d23864c253fecd6c8bf70e158ba5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "372bf867c1fc1d83c2cd37f286f50e2f237d23864c253fecd6c8bf70e158ba5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "372bf867c1fc1d83c2cd37f286f50e2f237d23864c253fecd6c8bf70e158ba5c", kill_on_drop: false }`
[INFO] [stdout] 372bf867c1fc1d83c2cd37f286f50e2f237d23864c253fecd6c8bf70e158ba5c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c24d46d2b98c4fa71f92ff21d12d222e20e50fe5d364e9a9a392c09fb751e14
[INFO] running `Command { std: "docker" "start" "-a" "3c24d46d2b98c4fa71f92ff21d12d222e20e50fe5d364e9a9a392c09fb751e14", kill_on_drop: false }`
[INFO] [stderr]    Compiling pulldown-cmark v0.2.0
[INFO] [stderr]    Compiling literalext v0.1.1
[INFO] [stderr]    Compiling matches v0.1.10
[INFO] [stderr]    Compiling maud_htmlescape v0.17.1
[INFO] [stderr]    Compiling getopts v0.2.24
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/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] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `literalext` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "3c24d46d2b98c4fa71f92ff21d12d222e20e50fe5d364e9a9a392c09fb751e14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c24d46d2b98c4fa71f92ff21d12d222e20e50fe5d364e9a9a392c09fb751e14", kill_on_drop: false }`
[INFO] [stdout] 3c24d46d2b98c4fa71f92ff21d12d222e20e50fe5d364e9a9a392c09fb751e14