[INFO] cloning repository https://github.com/itsybitesyspider/mallard
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/itsybitesyspider/mallard" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitsybitesyspider%2Fmallard", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitsybitesyspider%2Fmallard'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5b73cb1427b033749d0060135eefcb659f443c50
[INFO] documenting itsybitesyspider/mallard/5b73cb1427b033749d0060135eefcb659f443c50 against 824336ad4127ce295849937a24c08a4aeff6ada7 for pr-162169
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fitsybitesyspider%2Fmallard" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/itsybitesyspider/mallard
[INFO] finished tweaking git repo https://github.com/itsybitesyspider/mallard
[INFO] tweaked toml for git repo https://github.com/itsybitesyspider/mallard written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/itsybitesyspider/mallard on toolchain 824336ad4127ce295849937a24c08a4aeff6ada7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+824336ad4127ce295849937a24c08a4aeff6ada7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/itsybitesyspider/mallard already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+824336ad4127ce295849937a24c08a4aeff6ada7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wgpu-core v0.6.5
[INFO] [stderr]   Downloaded gfx-memory v0.2.2
[INFO] [stderr]   Downloaded gfx-backend-empty v0.6.0
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[INFO] [stderr]   Downloaded gfx-auxil v0.7.0
[INFO] [stderr]   Downloaded wgpu-types v0.6.1
[INFO] [stderr]   Downloaded gfx-descriptor v0.2.0
[INFO] [stderr]   Downloaded typed-arena v2.0.1
[INFO] [stderr]   Downloaded libloading v0.6.6
[INFO] [stderr]   Downloaded naga v0.2.0
[INFO] [stderr]   Downloaded shaderc v0.6.3
[INFO] [stderr]   Downloaded getrandom v0.2.0
[INFO] [stderr]   Downloaded gfx-backend-vulkan v0.6.5
[INFO] [stderr]   Downloaded rand_core v0.6.0
[INFO] [stderr]   Downloaded x11 v2.18.2
[INFO] [stderr]   Downloaded gfx-backend-dx11 v0.6.17
[INFO] [stderr]   Downloaded gfx-hal v0.6.0
[INFO] [stderr]   Downloaded gfx-backend-dx12 v0.6.13
[INFO] [stderr]   Downloaded weezl v0.1.3
[INFO] [stderr]   Downloaded gif v0.11.1
[INFO] [stderr]   Downloaded bytemuck v1.4.1
[INFO] [stderr]   Downloaded wgpu v0.6.2
[INFO] [stderr]   Downloaded cgmath v0.17.0
[INFO] [stderr]   Downloaded rand v0.8.0
[INFO] [stderr]   Downloaded gfx-backend-metal v0.6.5
[INFO] [stderr]   Downloaded image v0.23.12
[INFO] [stderr]   Downloaded jpeg-decoder v0.1.20
[INFO] [stderr]   Downloaded spirv_cross v0.22.2
[INFO] [stderr]   Downloaded metal v0.20.0
[INFO] [stderr]   Downloaded shaderc-sys v0.6.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622
[INFO] running `Command { std: "docker" "start" "203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622" "/opt/rustwide/cargo-home/bin/cargo" "+824336ad4127ce295849937a24c08a4aeff6ada7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-w" "/opt/rustwide/workdir" "--user" "0:0" "203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622" "/opt/rustwide/cargo-home/bin/cargo" "+824336ad4127ce295849937a24c08a4aeff6ada7" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling syn v1.0.56
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling const_fn v0.4.4
[INFO] [stderr]    Compiling memchr v2.3.4
[INFO] [stderr]    Compiling quote v1.0.8
[INFO] [stderr]    Compiling x11 v2.18.2
[INFO] [stderr]     Checking once_cell v1.5.2
[INFO] [stderr]    Compiling getrandom v0.2.0
[INFO] [stderr]     Checking futures-sink v0.3.8
[INFO] [stderr]     Checking smallvec v1.5.1
[INFO] [stderr]     Checking futures-core v0.3.8
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking libloading v0.6.6
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling miniz_oxide v0.4.3
[INFO] [stderr]     Checking futures-task v0.3.8
[INFO] [stderr]     Checking bit-vec v0.6.3
[INFO] [stderr]     Checking futures-io v0.3.8
[INFO] [stderr]     Checking futures-channel v0.3.8
[INFO] [stderr]     Checking ash v0.31.0
[INFO] [stderr]     Checking bit-set v0.5.2
[INFO] [stderr]     Checking spirv_headers v1.5.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking tracing-core v0.1.17
[INFO] [stderr]     Checking inplace_it v0.3.2
[INFO] [stderr]     Checking weezl v0.1.3
[INFO] [stderr]     Checking raw-window-handle v0.3.3
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking gfx-hal v0.6.0
[INFO] [stderr]     Checking parking_lot_core v0.8.2
[INFO] [stderr]     Checking pin-project-lite v0.2.0
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking deflate v0.8.6
[INFO] [stderr]     Checking crossbeam-epoch v0.9.1
[INFO] [stderr]    Compiling jobserver v0.1.21
[INFO] [stderr]     Checking crossbeam-channel v0.5.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_core v0.6.0
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking tracing v0.1.22
[INFO] [stderr]    Compiling cc v1.0.66
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking wgpu-types v0.6.1
[INFO] [stderr]    Compiling cgmath v0.17.0
[INFO] [stderr]     Checking copyless v0.1.5
[INFO] [stderr]     Checking gif v0.11.1
[INFO] [stderr]     Checking rand_chacha v0.3.0
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking scoped_threadpool v0.1.9
[INFO] [stderr]     Checking bytemuck v1.4.1
[INFO] [stderr]     Checking typed-arena v2.0.1
[INFO] [stderr]     Checking rand v0.8.0
[INFO] [stderr]     Checking rayon-core v1.9.0
[INFO] [stderr]    Compiling cmake v0.1.45
[INFO] [stderr]     Checking rayon v1.5.0
[INFO] [stderr]    Compiling shaderc-sys v0.6.3
[INFO] [stderr] warning: shaderc-sys@0.6.3: Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr] warning: shaderc-sys@0.6.3: System installed library not found.  Falling back to build from source
[INFO] [stderr] error: failed to run custom build command for `shaderc-sys v0.6.3`
[INFO] [stderr] note: To improve backtraces for build dependencies, set the CARGO_PROFILE_DEV_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/target/debug/build/shaderc-sys/74bd7051cd5e1390/out/build_script_build` (exit status: 101)
[INFO] [stderr]   --- stdout
[INFO] [stderr]   cargo:warning=Checking for system installed libraries.  Use --features = build-from-source to disable this behavior
[INFO] [stderr]   cargo:warning=System installed library not found.  Falling back to build from source
[INFO] [stderr] 
[INFO] [stderr]   --- stderr
[INFO] [stderr] 
[INFO] [stderr]   thread 'main' (876) panicked at /opt/rustwide/cargo-home/registry/src/index.crates.io-1949cf8c6b5b557f/shaderc-sys-0.6.3/build/cmd_finder.rs:50:13:
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr]   couldn't find required command: "python"
[INFO] [stderr] 
[INFO] [stderr] 
[INFO] [stderr]   stack backtrace:
[INFO] [stderr]      0:     0x616114b51c91 - std[f5be89705b66062b]::backtrace_rs::backtrace::libunwind::trace
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/../../backtrace/src/backtrace/libunwind.rs:117:9
[INFO] [stderr]      1:     0x616114b51c91 - std[f5be89705b66062b]::backtrace_rs::backtrace::trace_unsynchronized::<std[f5be89705b66062b]::sys::backtrace::_print_fmt::{closure#1}>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/../../backtrace/src/backtrace/mod.rs:66:14
[INFO] [stderr]      2:     0x616114b51c91 - std[f5be89705b66062b]::sys::backtrace::_print_fmt
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/sys/backtrace.rs:74:9
[INFO] [stderr]      3:     0x616114b51c91 - <<std[f5be89705b66062b]::sys::backtrace::BacktraceLock>::print::DisplayBacktrace as core[231cbb5c4c9de7db]::fmt::Display>::fmt
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/sys/backtrace.rs:44:26
[INFO] [stderr]      4:     0x616114b6651a - <core[231cbb5c4c9de7db]::fmt::rt::Argument>::fmt
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/core/src/fmt/rt.rs:152:76
[INFO] [stderr]      5:     0x616114b6651a - core[231cbb5c4c9de7db]::fmt::write
[INFO] [stderr]      6:     0x616114b57c8c - core[231cbb5c4c9de7db]::io::write::default_write_fmt::<std[f5be89705b66062b]::sys::stdio::unix::Stderr>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/core/src/io/write.rs:402:11
[INFO] [stderr]      7:     0x616114b57c8c - <std[f5be89705b66062b]::sys::stdio::unix::Stderr as core[231cbb5c4c9de7db]::io::write::Write>::write_fmt
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/core/src/io/write.rs:335:13
[INFO] [stderr]      8:     0x616114b301f6 - <std[f5be89705b66062b]::sys::backtrace::BacktraceLock>::print
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/sys/backtrace.rs:47:9
[INFO] [stderr]      9:     0x616114b301f6 - std[f5be89705b66062b]::panicking::default_hook::{closure#0}
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:289:27
[INFO] [stderr]     10:     0x616114b4c3e1 - std[f5be89705b66062b]::panicking::default_hook
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:316:9
[INFO] [stderr]     11:     0x616114b4c59b - std[f5be89705b66062b]::panicking::panic_with_hook
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:811:13
[INFO] [stderr]     12:     0x616114b302a2 - std[f5be89705b66062b]::panicking::panic_handler::{closure#0}
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:685:13
[INFO] [stderr]     13:     0x616114b2a0b9 - std[f5be89705b66062b]::sys::backtrace::__rust_end_short_backtrace::<std[f5be89705b66062b]::panicking::panic_handler::{closure#0}, !>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/sys/backtrace.rs:182:18
[INFO] [stderr]     14:     0x616114b30a8d - __rustc[6119d01f67ee2b22]::rust_begin_unwind
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:676:5
[INFO] [stderr]     15:     0x616114b66c8c - core[231cbb5c4c9de7db]::panicking::panic_fmt
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/core/src/panicking.rs:80:14
[INFO] [stderr]     16:     0x616114ad0e56 - <build_script_build[9387d6cda4667600]::cmd_finder::CommandFinder>::must_have::<&str>::{closure#0}
[INFO] [stderr]     17:     0x616114ace570 - <core[231cbb5c4c9de7db]::option::Option<std[f5be89705b66062b]::path::PathBuf>>::unwrap_or_else::<<build_script_build[9387d6cda4667600]::cmd_finder::CommandFinder>::must_have<&str>::{closure#0}>
[INFO] [stderr]     18:     0x616114ace880 - <build_script_build[9387d6cda4667600]::cmd_finder::CommandFinder>::must_have::<&str>
[INFO] [stderr]     19:     0x616114ad47ed - build_script_build[9387d6cda4667600]::main
[INFO] [stderr]     20:     0x616114ad75f3 - <fn() as core[231cbb5c4c9de7db]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]     21:     0x616114ad03de - std[f5be89705b66062b]::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
[INFO] [stderr]     22:     0x616114ad0ff9 - std[f5be89705b66062b]::rt::lang_start::<()>::{closure#0}
[INFO] [stderr]     23:     0x616114b4b7e8 - <&dyn core[231cbb5c4c9de7db]::ops::function::Fn<(), Output = i32> + core[231cbb5c4c9de7db]::panic::unwind_safe::RefUnwindSafe + core[231cbb5c4c9de7db]::marker::Sync as core[231cbb5c4c9de7db]::ops::function::FnOnce<()>>::call_once
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/core/src/ops/function.rs:287:21
[INFO] [stderr]     24:     0x616114b4b7e8 - std[f5be89705b66062b]::panicking::catch_unwind::do_call::<&dyn core[231cbb5c4c9de7db]::ops::function::Fn<(), Output = i32> + core[231cbb5c4c9de7db]::panic::unwind_safe::RefUnwindSafe + core[231cbb5c4c9de7db]::marker::Sync, i32>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:573:43
[INFO] [stderr]     25:     0x616114b4b7e8 - std[f5be89705b66062b]::panicking::catch_unwind::<i32, &dyn core[231cbb5c4c9de7db]::ops::function::Fn<(), Output = i32> + core[231cbb5c4c9de7db]::panic::unwind_safe::RefUnwindSafe + core[231cbb5c4c9de7db]::marker::Sync>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:541:19
[INFO] [stderr]     26:     0x616114b4b7e8 - std[f5be89705b66062b]::panic::catch_unwind::<&dyn core[231cbb5c4c9de7db]::ops::function::Fn<(), Output = i32> + core[231cbb5c4c9de7db]::panic::unwind_safe::RefUnwindSafe + core[231cbb5c4c9de7db]::marker::Sync, i32>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panic.rs:359:14
[INFO] [stderr]     27:     0x616114b4b7e8 - std[f5be89705b66062b]::rt::lang_start_internal::{closure#0}
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/rt.rs:175:24
[INFO] [stderr]     28:     0x616114b4b7e8 - std[f5be89705b66062b]::panicking::catch_unwind::do_call::<std[f5be89705b66062b]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:573:43
[INFO] [stderr]     29:     0x616114b4b7e8 - std[f5be89705b66062b]::panicking::catch_unwind::<isize, std[f5be89705b66062b]::rt::lang_start_internal::{closure#0}>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panicking.rs:541:19
[INFO] [stderr]     30:     0x616114b4b7e8 - std[f5be89705b66062b]::panic::catch_unwind::<std[f5be89705b66062b]::rt::lang_start_internal::{closure#0}, isize>
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/panic.rs:359:14
[INFO] [stderr]     31:     0x616114b4b7e8 - std[f5be89705b66062b]::rt::lang_start_internal
[INFO] [stderr]                                  at /rustc/824336ad4127ce295849937a24c08a4aeff6ada7/library/std/src/rt.rs:171:5
[INFO] [stderr]     32:     0x616114ad03d1 - std[f5be89705b66062b]::rt::lang_start::<()>
[INFO] [stderr]     33:     0x616114ad76e5 - main
[INFO] [stderr]     34:     0x763661bc4601 - <unknown>
[INFO] [stderr]     35:     0x763661bc4718 - __libc_start_main
[INFO] [stderr]     36:     0x616114acd9f5 - _start
[INFO] [stderr]     37:                0x0 - <unknown>
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622", kill_on_drop: false }`
[INFO] [stdout] 203d4116e5c02314054c9ab06fae1b61e716100edec6288dd0a924076c984622
