[INFO] fetching crate render_macros 0.3.1...
[INFO] documenting render_macros-0.3.1 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate render_macros 0.3.1 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate render_macros 0.3.1 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate render_macros 0.3.1
[INFO] finished tweaking crates.io crate render_macros 0.3.1
[INFO] tweaked toml for crates.io crate render_macros 0.3.1 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded render v0.3.1
[INFO] [stderr]   Downloaded render_macros v0.3.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a2cf61e3c7aa6a119ce3f4b6fe076287af960f6b2f3f64a51ae5e3732a8e4a8b
[INFO] running `Command { std: "docker" "start" "-a" "a2cf61e3c7aa6a119ce3f4b6fe076287af960f6b2f3f64a51ae5e3732a8e4a8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2cf61e3c7aa6a119ce3f4b6fe076287af960f6b2f3f64a51ae5e3732a8e4a8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2cf61e3c7aa6a119ce3f4b6fe076287af960f6b2f3f64a51ae5e3732a8e4a8b", kill_on_drop: false }`
[INFO] [stdout] a2cf61e3c7aa6a119ce3f4b6fe076287af960f6b2f3f64a51ae5e3732a8e4a8b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cf0ea4e19ac9ce442d66089f4d641926272af6b91e4a1528590dac30ec788dac
[INFO] running `Command { std: "docker" "start" "-a" "cf0ea4e19ac9ce442d66089f4d641926272af6b91e4a1528590dac30ec788dac", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.78
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]  Documenting render_macros v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(proc_macro_diagnostic)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: redundant explicit link target
[INFO] [stdout]    --> src/lib.rs:139:16
[INFO] [stdout]     |
[INFO] [stdout] 139 | /// [`String`](std::string::String):
[INFO] [stdout]     |      --------  ^^^^^^^^^^^^^^^^^^^ explicit target is redundant
[INFO] [stdout]     |      |
[INFO] [stdout]     |      because label contains path that resolves to same destination
[INFO] [stdout]     |
[INFO] [stdout]     = note: when a link's destination is not specified,
[INFO] [stdout]             the label is used to resolve intra-doc links
[INFO] [stdout]     = note: `#[warn(rustdoc::redundant_explicit_links)]` on by default
[INFO] [stdout] help: remove explicit link target
[INFO] [stdout]     |
[INFO] [stdout] 139 | /// [`String`]:
[INFO] [stdout]     |     ~~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `render_macros`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.76.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type proc-macro --crate-name render_macros src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=5e30a02be1e70d8b -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-1bc556be54688c37.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-44762e16f83d10ff.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-931b7ad2a3e506f1.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "cf0ea4e19ac9ce442d66089f4d641926272af6b91e4a1528590dac30ec788dac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cf0ea4e19ac9ce442d66089f4d641926272af6b91e4a1528590dac30ec788dac", kill_on_drop: false }`
[INFO] [stdout] cf0ea4e19ac9ce442d66089f4d641926272af6b91e4a1528590dac30ec788dac
