[INFO] cloning repository https://github.com/wetlo/slidmk
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/wetlo/slidmk" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwetlo%2Fslidmk", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwetlo%2Fslidmk'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3f24d7efdcb8cad3706ab3d2e5fa56f843d31ed7
[INFO] documenting wetlo/slidmk against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fwetlo%2Fslidmk" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/wetlo/slidmk on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/wetlo/slidmk
[INFO] finished tweaking git repo https://github.com/wetlo/slidmk
[INFO] tweaked toml for git repo https://github.com/wetlo/slidmk written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/wetlo/slidmk already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 996d4d3e2d60df99d5a2205cd0eff78e3a9c7f1c85e7f9bede74e6037101a048
[INFO] running `Command { std: "docker" "start" "-a" "996d4d3e2d60df99d5a2205cd0eff78e3a9c7f1c85e7f9bede74e6037101a048", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "996d4d3e2d60df99d5a2205cd0eff78e3a9c7f1c85e7f9bede74e6037101a048", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "996d4d3e2d60df99d5a2205cd0eff78e3a9c7f1c85e7f9bede74e6037101a048", kill_on_drop: false }`
[INFO] [stdout] 996d4d3e2d60df99d5a2205cd0eff78e3a9c7f1c85e7f9bede74e6037101a048
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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" "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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 645d75c87096e1a681231f5827b4fb32e7f1dfdbadf2085a6a2ac3a7357c706e
[INFO] running `Command { std: "docker" "start" "-a" "645d75c87096e1a681231f5827b4fb32e7f1dfdbadf2085a6a2ac3a7357c706e", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling version_check v0.9.3
[INFO] [stderr]    Compiling proc-macro2 v1.0.27
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling const_fn v0.4.8
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]     Checking weezl v0.1.5
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]     Checking color_quant v1.1.0
[INFO] [stderr]     Checking jpeg-decoder v0.1.22
[INFO] [stderr]     Checking serde v0.8.23
[INFO] [stderr]     Checking unicode-width v0.1.8
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking dtoa v0.4.8
[INFO] [stderr]     Checking bytemuck v1.5.1
[INFO] [stderr]     Checking vec_map v0.8.2
[INFO] [stderr]     Checking itoa v0.4.7
[INFO] [stderr]     Checking strsim v0.8.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking ansi_term v0.11.0
[INFO] [stderr]     Checking ttf-parser v0.6.2
[INFO] [stderr]     Checking lzw v0.10.0
[INFO] [stderr]     Checking ttf-parser v0.12.3
[INFO] [stderr]     Checking ab_glyph_rasterizer v0.1.4
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]     Checking arrayvec v0.7.1
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking encoding-index-korean v1.20141219.5
[INFO] [stderr]     Checking encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]     Checking encoding-index-japanese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]     Checking encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]     Checking stb_truetype v0.3.1
[INFO] [stderr]     Checking miniz_oxide v0.3.7
[INFO] [stderr]     Checking deflate v0.8.6
[INFO] [stderr]     Checking utf8-chars v1.0.2
[INFO] [stderr]     Checking gif v0.11.2
[INFO] [stderr]    Compiling syn v0.10.8
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-iter v0.1.42
[INFO] [stderr]    Compiling num-rational v0.3.2
[INFO] [stderr]    Compiling standback v0.2.17
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling time v0.2.26
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]     Checking encoding v0.2.33
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking owned_ttf_parser v0.6.0
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking memmap2 v0.2.3
[INFO] [stderr]     Checking dirs-sys v0.3.6
[INFO] [stderr]     Checking rusttype v0.9.2
[INFO] [stderr]    Compiling serde_codegen_internals v0.11.3
[INFO] [stderr]     Checking clap v2.33.3
[INFO] [stderr]     Checking fontdb v0.5.4
[INFO] [stderr]     Checking directories v3.0.2
[INFO] [stderr]     Checking tiff v0.6.1
[INFO] [stderr]     Checking flate2 v1.0.20
[INFO] [stderr]    Compiling serde_codegen v0.8.23
[INFO] [stderr]     Checking serde_test v0.8.23
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking ordered-float v1.1.1
[INFO] [stderr]     Checking num-traits v0.1.43
[INFO] [stderr]     Checking linked-hash-map v0.3.0
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking rusttype v0.8.3
[INFO] [stderr]     Checking image v0.23.14
[INFO] [stderr]    Compiling serde_derive v0.8.23
[INFO] [stderr]     Checking serde-hjson v0.9.1
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]    Compiling structopt-derive v0.4.15
[INFO] [stderr]     Checking time-macros v0.1.1
[INFO] [stderr]     Checking lopdf v0.26.0
[INFO] [stderr]     Checking structopt v0.3.22
[INFO] [stderr]     Checking printpdf v0.3.4
[INFO] [stderr]  Documenting slidmk v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(result_flattening, try_blocks, iter_intersperse)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `slidmk`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name slidmk src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=95a76742cdcfb223 -L dependency=/opt/rustwide/target/debug/deps --extern arrayvec=/opt/rustwide/target/debug/deps/libarrayvec-7a0cd4b4f55cdcc6.rmeta --extern directories=/opt/rustwide/target/debug/deps/libdirectories-cfb329a914942aa1.rmeta --extern fontdb=/opt/rustwide/target/debug/deps/libfontdb-4df3954c8f63d8d2.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-1479f2b7adeaa2b6.rmeta --extern printpdf=/opt/rustwide/target/debug/deps/libprintpdf-c6324d7c98ce4054.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-f583fade8d015eab.rmeta --extern rusttype=/opt/rustwide/target/debug/deps/librusttype-c97e25df73f46e88.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-bf94024bcb1b7a16.rmeta --extern serde_hjson=/opt/rustwide/target/debug/deps/libserde_hjson-bda4b5c4b498ffb5.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-10852681b9a95822.so --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-3c33b1a01006cfd5.rmeta --extern utf8_chars=/opt/rustwide/target/debug/deps/libutf8_chars-5a7f2720aa61bace.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "645d75c87096e1a681231f5827b4fb32e7f1dfdbadf2085a6a2ac3a7357c706e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "645d75c87096e1a681231f5827b4fb32e7f1dfdbadf2085a6a2ac3a7357c706e", kill_on_drop: false }`
[INFO] [stdout] 645d75c87096e1a681231f5827b4fb32e7f1dfdbadf2085a6a2ac3a7357c706e