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# rustc version rustc 1.94.0-nightly (f57eac1bf 2026-01-10)
# docs.rs version docsrs 0.1.0 (7bfb09c2 2026-01-03 )
# build log [INFO] running `Command { std: "docker" "create" "-v" "/home/cratesfyi/workspace/builds/differs-0.0.1/target:/opt/rustwide/target:rw,Z" "-v" "/home/cratesfyi/workspace/builds/differs-0.0.1/source:/opt/rustwide/workdir:ro,Z" "-v" "/home/cratesfyi/workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/home/cratesfyi/workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "DOCS_RS=1" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "6442450944" "--cpus" "6" "--user" "1001:1001" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:aa71247004a7fa38d13ec170f48f06cdedf5bc50b2a8645e56ed7e992e6fa513" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "rustdoc" "--lib" "-Zrustdoc-map" "--config" "build.rustdocflags=[\"--cfg\", \"docsrs\", \"-Z\", \"unstable-options\", \"--emit=invocation-specific\", \"--resource-suffix\", \"-20260110-1.94.0-nightly-f57eac1bf\", \"--static-root-path\", \"/-/rustdoc.static/\", \"--cap-lints\", \"warn\", \"--extern-html-root-takes-precedence\"]" "--offline" "-Zunstable-options" "--config=doc.extern-map.registries.crates-io=\"https://docs.rs/{pkg_name}/{version}/x86_64-unknown-linux-gnu\"" "-Zrustdoc-scrape-examples" "-j6" "--target" "x86_64-unknown-linux-gnu", kill_on_drop: false }` [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] [stdout] 0bbccdda67692ad1afddcf6e11912f27482ef802a5d9a31e6f6472c027a8403c [INFO] running `Command { std: "docker" "start" "-a" "0bbccdda67692ad1afddcf6e11912f27482ef802a5d9a31e6f6472c027a8403c", kill_on_drop: false }` [INFO] [stderr] Scraping differs v0.0.1 (/opt/rustwide/workdir) [INFO] [stderr] Documenting differs v0.0.1 (/opt/rustwide/workdir) [INFO] [stderr] [INFO] [stderr] thread 'rustc' (66) panicked at src/librustdoc/html/highlight.rs:234:42: [INFO] [stderr] `exit_elem` called on empty class stack parent [INFO] [stderr] stack backtrace: [INFO] [stderr] 0: 0x7fb26ae404f3 - <<std[14974c2a6d31bd09]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[75fca27d79ab979d]::fmt::Display>::fmt [INFO] [stderr] 1: 0x7fb26b40fac8 - core[75fca27d79ab979d]::fmt::write [INFO] [stderr] 2: 0x7fb26ae56776 - <std[14974c2a6d31bd09]::sys::stdio::unix::Stderr as std[14974c2a6d31bd09]::io::Write>::write_fmt [INFO] [stderr] 3: 0x7fb26ae160e8 - std[14974c2a6d31bd09]::panicking::default_hook::{closure#0} [INFO] [stderr] 4: 0x7fb26ae33d83 - std[14974c2a6d31bd09]::panicking::default_hook [INFO] [stderr] 5: 0x7fb269e15eaa - std[14974c2a6d31bd09]::panicking::update_hook::<alloc[97bcaa3c9f42b50c]::boxed::Box<rustc_driver_impl[8626402415690959]::install_ice_hook::{closure#1}>>::{closure#0} [INFO] [stderr] 6: 0x7fb26ae34062 - std[14974c2a6d31bd09]::panicking::panic_with_hook [INFO] [stderr] 7: 0x7fb26ae161a8 - std[14974c2a6d31bd09]::panicking::panic_handler::{closure#0} [INFO] [stderr] 8: 0x7fb26ae0a659 - std[14974c2a6d31bd09]::sys::backtrace::__rust_end_short_backtrace::<std[14974c2a6d31bd09]::panicking::panic_handler::{closure#0}, !> [INFO] [stderr] 9: 0x7fb26ae17c7d - __rustc[92b3c909df398c49]::rust_begin_unwind [INFO] [stderr] 10: 0x7fb26824b37c - core[75fca27d79ab979d]::panicking::panic_fmt [INFO] [stderr] 11: 0x7fb268734914 - core[75fca27d79ab979d]::option::expect_failed [INFO] [stderr] 12: 0x560d33e01d14 - rustdoc[4fa5b62671c887e5]::html::highlight::write_code::<core[75fca27d79ab979d]::fmt::Formatter>::{closure#2} [INFO] [stderr] 13: 0x560d33f57156 - rustdoc[4fa5b62671c887e5]::html::highlight::classify [INFO] [stderr] 14: 0x560d33d430a0 - rustdoc[4fa5b62671c887e5]::html::highlight::write_code::<core[75fca27d79ab979d]::fmt::Formatter> [INFO] [stderr] 15: 0x560d3400d76b - <&core[75fca27d79ab979d]::fmt::builders::FromFn<rustdoc[4fa5b62671c887e5]::html::sources::print_src<&mut core[75fca27d79ab979d]::fmt::Formatter>::{closure#0}> as core[75fca27d79ab979d]::fmt::Display>::fmt [INFO] [stderr] 16: 0x7fb26b40fac8 - core[75fca27d79ab979d]::fmt::write [INFO] [stderr] 17: 0x560d3400db81 - <&askama[2946bdbe25fc544b]::filters::escape::Safe<&core[75fca27d79ab979d]::fmt::builders::FromFn<rustdoc[4fa5b62671c887e5]::html::sources::print_src<&mut core[75fca27d79ab979d]::fmt::Formatter>::{closure#0}>> as core[75fca27d79ab979d]::fmt::Display>::fmt [INFO] [stderr] 18: 0x7fb26b40fac8 - core[75fca27d79ab979d]::fmt::write [INFO] [stderr] 19: 0x560d33e00f38 - rustdoc[4fa5b62671c887e5]::html::render::render_call_locations::<&mut core[75fca27d79ab979d]::fmt::Formatter>::{closure#2} [INFO] [stderr] 20: 0x560d34044ab5 - <core[75fca27d79ab979d]::fmt::builders::FromFn<rustdoc[4fa5b62671c887e5]::html::render::document_full_inner::{closure#0}> as core[75fca27d79ab979d]::fmt::Display>::fmt [INFO] [stderr] 21: 0x560d33c9e1b5 - rustdoc[4fa5b62671c887e5]::html::render::render_impl::{closure#0}::doc_impl_item::<&mut alloc[97bcaa3c9f42b50c]::string::String, &mut alloc[97bcaa3c9f42b50c]::string::String> [INFO] [stderr] 22: 0x560d340422dc - <core[75fca27d79ab979d]::fmt::builders::FromFn<rustdoc[4fa5b62671c887e5]::html::render::render_impl::{closure#0}> as core[75fca27d79ab979d]::fmt::Display>::fmt [INFO] [stderr] 23: 0x560d33f51b01 - rustdoc[4fa5b62671c887e5]::html::render::render_assoc_items_inner [INFO] [stderr] 24: 0x560d340443c4 - <core[75fca27d79ab979d]::fmt::builders::FromFn<rustdoc[4fa5b62671c887e5]::html::render::render_assoc_items::{closure#0}> as core[75fca27d79ab979d]::fmt::Display>::fmt [INFO] [stderr] 25: 0x7fb26b40fac8 - core[75fca27d79ab979d]::fmt::write [INFO] [stderr] 26: 0x560d33c62514 - <rustdoc[4fa5b62671c887e5]::html::render::print_item::DisplayStruct>::render_into::<core[75fca27d79ab979d]::fmt::Formatter> [INFO] [stderr] 27: 0x560d34048950 - <core[75fca27d79ab979d]::fmt::builders::FromFn<rustdoc[4fa5b62671c887e5]::html::render::print_item::item_struct::{closure#0}> as core[75fca27d79ab979d]::fmt::Display>::fmt [INFO] [stderr] 28: 0x7fb26b40fac8 - core[75fca27d79ab979d]::fmt::write [INFO] [stderr] 29: 0x560d33d3ccfb - rustdoc[4fa5b62671c887e5]::html::layout::render::<core[75fca27d79ab979d]::fmt::builders::FromFn<rustdoc[4fa5b62671c887e5]::html::render::print_item::print_item::{closure#0}>, core[75fca27d79ab979d]::fmt::builders::FromFn<<rustdoc[4fa5b62671c887e5]::html::render::context::Context>::render_item::{closure#1}>> [INFO] [stderr] 30: 0x560d33e89b35 - <rustdoc[4fa5b62671c887e5]::html::render::context::Context>::render_item [INFO] [stderr] 31: 0x560d34029a0e - <rustdoc[4fa5b62671c887e5]::html::render::context::Context as rustdoc[4fa5b62671c887e5]::formats::renderer::FormatRenderer>::item [INFO] [stderr] 32: 0x560d33d45959 - rustdoc[4fa5b62671c887e5]::formats::renderer::run_format_inner::<rustdoc[4fa5b62671c887e5]::html::render::context::Context> [INFO] [stderr] 33: 0x560d33d45b09 - rustdoc[4fa5b62671c887e5]::formats::renderer::run_format_inner::<rustdoc[4fa5b62671c887e5]::html::render::context::Context> [INFO] [stderr] 34: 0x560d33e08d4d - rustdoc[4fa5b62671c887e5]::main_args::{closure#2}::{closure#0} [INFO] [stderr] 35: 0x560d33dfc97c - rustc_interface[90afb413dadbe4f1]::interface::run_compiler::<(), rustdoc[4fa5b62671c887e5]::main_args::{closure#2}>::{closure#1} [INFO] [stderr] 36: 0x560d33d30908 - std[14974c2a6d31bd09]::sys::backtrace::__rust_begin_short_backtrace::<rustc_interface[90afb413dadbe4f1]::util::run_in_thread_with_globals<rustc_interface[90afb413dadbe4f1]::util::run_in_thread_pool_with_globals<rustc_interface[90afb413dadbe4f1]::interface::run_compiler<(), rustdoc[4fa5b62671c887e5]::main_args::{closure#2}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()> [INFO] [stderr] 37: 0x560d33e2f497 - <std[14974c2a6d31bd09]::thread::lifecycle::spawn_unchecked<rustc_interface[90afb413dadbe4f1]::util::run_in_thread_with_globals<rustc_interface[90afb413dadbe4f1]::util::run_in_thread_pool_with_globals<rustc_interface[90afb413dadbe4f1]::interface::run_compiler<(), rustdoc[4fa5b62671c887e5]::main_args::{closure#2}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}, ()>::{closure#1} as core[75fca27d79ab979d]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0} [INFO] [stderr] 38: 0x7fb26c468438 - <std[14974c2a6d31bd09]::sys::thread::unix::Thread>::new::thread_start [INFO] [stderr] 39: 0x7fb26608aaa4 - <unknown> [INFO] [stderr] 40: 0x7fb266117a64 - clone [INFO] [stderr] 41: 0x0 - <unknown> [INFO] [stderr] [INFO] [stderr] error: the compiler unexpectedly panicked. this is a bug. [INFO] [stderr] [INFO] [stderr] note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-rustdoc&template=ice.md [INFO] [stderr] [INFO] [stderr] note: please make sure that you have updated to the latest nightly [INFO] [stderr] [INFO] [stderr] warning: the ICE couldn't be written to `/opt/rustwide/workdir/rustc-ice-2026-01-11T04_08_47-65.txt`: Read-only file system (os error 30) [INFO] [stderr] [INFO] [stderr] note: rustc 1.94.0-nightly (f57eac1bf 2026-01-10) running on x86_64-unknown-linux-gnu [INFO] [stderr] [INFO] [stderr] note: compiler flags: --crate-type lib -Z unstable-options -Z unstable-options -Z unstable-options [INFO] [stderr] [INFO] [stderr] note: some of the compiler flags provided by cargo are hidden [INFO] [stderr] [INFO] [stderr] query stack during panic: [INFO] [stderr] end of query stack [INFO] [stderr] error: could not document `differs` [INFO] running `Command { std: "docker" "inspect" "0bbccdda67692ad1afddcf6e11912f27482ef802a5d9a31e6f6472c027a8403c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0bbccdda67692ad1afddcf6e11912f27482ef802a5d9a31e6f6472c027a8403c", kill_on_drop: false }` [INFO] [stdout] 0bbccdda67692ad1afddcf6e11912f27482ef802a5d9a31e6f6472c027a8403c