[INFO] cloning repository https://github.com/pemistahl/chr [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pemistahl/chr" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpemistahl%2Fchr", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpemistahl%2Fchr'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] f85581b8696f9033c41c0c35e693ae3c8f8db13b [INFO] checking pemistahl/chr against try#45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 for pr-83744 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpemistahl%2Fchr" "/workspace/builds/worker-1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/pemistahl/chr on toolchain 45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/pemistahl/chr [INFO] finished tweaking git repo https://github.com/pemistahl/chr [INFO] tweaked toml for git repo https://github.com/pemistahl/chr written to /workspace/builds/worker-1/source/Cargo.toml [INFO] crate git repo https://github.com/pemistahl/chr already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded predicates v1.0.6 [INFO] [stderr] Downloaded minus v2.1.0 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "metadata" "--no-deps" "--format-version=1", 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] 523267b073ec2769c1a4518e7cc0fab30db14573ac59475bd9735beb10bea4cb [INFO] running `Command { std: "docker" "start" "-a" "523267b073ec2769c1a4518e7cc0fab30db14573ac59475bd9735beb10bea4cb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "523267b073ec2769c1a4518e7cc0fab30db14573ac59475bd9735beb10bea4cb", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "523267b073ec2769c1a4518e7cc0fab30db14573ac59475bd9735beb10bea4cb", kill_on_drop: false }` [INFO] [stdout] 523267b073ec2769c1a4518e7cc0fab30db14573ac59475bd9735beb10bea4cb [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=forbid" "-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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 920cfbe464a78c13d484f73d9d3f4aaeab399e6c4e1ebbeb73b48165f78fa48d [INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap. [INFO] running `Command { std: "docker" "start" "-a" "920cfbe464a78c13d484f73d9d3f4aaeab399e6c4e1ebbeb73b48165f78fa48d", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.81 [INFO] [stderr] Compiling proc-macro2 v1.0.24 [INFO] [stderr] Compiling syn v1.0.57 [INFO] [stderr] Compiling pkg-config v0.3.19 [INFO] [stderr] Compiling cc v1.0.66 [INFO] [stderr] Compiling memchr v2.3.4 [INFO] [stderr] Compiling version_check v0.9.2 [INFO] [stderr] Compiling futures-core v0.3.8 [INFO] [stderr] Compiling slab v0.4.2 [INFO] [stderr] Compiling pin-project-internal v0.4.27 [INFO] [stderr] Compiling serde_derive v1.0.118 [INFO] [stderr] Compiling crc32fast v1.2.1 [INFO] [stderr] Compiling pin-project-lite v0.1.11 [INFO] [stderr] Compiling serde v1.0.118 [INFO] [stderr] Compiling foreign-types-shared v0.1.1 [INFO] [stderr] Checking cfg-if v1.0.0 [INFO] [stderr] Compiling openssl v0.10.32 [INFO] [stderr] Compiling pin-project-lite v0.2.0 [INFO] [stderr] Compiling matches v0.1.8 [INFO] [stderr] Compiling once_cell v1.5.2 [INFO] [stderr] Compiling futures-io v0.3.8 [INFO] [stderr] Compiling pin-utils v0.1.0 [INFO] [stderr] Compiling tinyvec_macros v0.1.0 [INFO] [stderr] Compiling futures-sink v0.3.8 [INFO] [stderr] Compiling try-lock v0.2.3 [INFO] [stderr] Compiling openssl-probe v0.1.2 [INFO] [stderr] Compiling percent-encoding v2.1.0 [INFO] [stderr] Checking smallvec v1.6.0 [INFO] [stderr] Compiling encoding_rs v0.8.26 [INFO] [stderr] Compiling tower-service v0.3.0 [INFO] [stderr] Compiling adler32 v1.2.0 [INFO] [stderr] Compiling httpdate v0.3.2 [INFO] [stderr] Compiling serde_json v1.0.61 [INFO] [stderr] Compiling mime v0.3.16 [INFO] [stderr] Compiling unicode-segmentation v1.7.1 [INFO] [stderr] Compiling base64 v0.13.0 [INFO] [stderr] Compiling ipnet v2.3.0 [INFO] [stderr] Compiling fallible-iterator v0.2.0 [INFO] [stderr] Compiling fallible-streaming-iterator v0.1.9 [INFO] [stderr] Checking regex-syntax v0.6.21 [INFO] [stderr] Checking predicates-core v1.0.1 [INFO] [stderr] Checking difference v2.0.0 [INFO] [stderr] Checking treeline v0.1.0 [INFO] [stderr] Checking normalize-line-endings v0.3.0 [INFO] [stderr] Checking strum v0.20.0 [INFO] [stderr] Compiling unindent v0.1.7 [INFO] [stderr] Compiling tracing-core v0.1.17 [INFO] [stderr] Compiling indexmap v1.6.1 [INFO] [stderr] Compiling num-traits v0.2.14 [INFO] [stderr] Compiling http v0.2.2 [INFO] [stderr] Compiling foreign-types v0.3.2 [INFO] [stderr] Checking instant v0.1.9 [INFO] [stderr] Checking thread_local v1.0.1 [INFO] [stderr] Compiling futures-channel v0.3.8 [INFO] [stderr] Compiling unicode-bidi v0.3.4 [INFO] [stderr] Compiling tinyvec v1.1.0 [INFO] [stderr] Compiling futures-task v0.3.8 [INFO] [stderr] Checking lock_api v0.4.2 [INFO] [stderr] Compiling miniz_oxide v0.3.7 [INFO] [stderr] Compiling form_urlencoded v1.0.0 [INFO] [stderr] Compiling unicase v2.6.0 [INFO] [stderr] Compiling proc-macro-error-attr v1.0.4 [INFO] [stderr] Compiling proc-macro-error v1.0.4 [INFO] [stderr] Compiling log v0.4.11 [INFO] [stderr] Compiling bitflags v1.2.1 [INFO] [stderr] Checking predicates-tree v1.0.1 [INFO] [stderr] Compiling byteorder v1.3.4 [INFO] [stderr] Compiling hashlink v0.6.0 [INFO] [stderr] Compiling ryu v1.0.5 [INFO] [stderr] Compiling heck v0.3.2 [INFO] [stderr] Compiling httparse v1.3.4 [INFO] [stderr] Compiling indoc v1.0.3 [INFO] [stderr] Compiling tracing v0.1.22 [INFO] [stderr] Compiling want v0.3.0 [INFO] [stderr] Compiling regex-automata v0.1.9 [INFO] [stderr] Compiling csv-core v0.1.10 [INFO] [stderr] Checking aho-corasick v0.7.15 [INFO] [stderr] Compiling unicode-normalization v0.1.16 [INFO] [stderr] Compiling quote v1.0.8 [INFO] [stderr] Compiling openssl-sys v0.9.60 [INFO] [stderr] Compiling bzip2-sys v0.1.9+1.0.8 [INFO] [stderr] Compiling libsqlite3-sys v0.20.1 [INFO] [stderr] Checking atty v0.2.14 [INFO] [stderr] Checking signal-hook-registry v1.3.0 [INFO] [stderr] Checking parking_lot_core v0.8.2 [INFO] [stderr] Checking mio v0.7.7 [INFO] [stderr] Checking flate2 v1.0.14 [INFO] [stderr] Checking dirs-sys v0.3.5 [INFO] [stderr] Checking time v0.1.44 [INFO] [stderr] Checking wait-timeout v0.2.0 [INFO] [stderr] Compiling iovec v0.1.4 [INFO] [stderr] Compiling net2 v0.2.37 [INFO] [stderr] Compiling num_cpus v1.13.0 [INFO] [stderr] Compiling socket2 v0.3.19 [INFO] [stderr] Checking clap v2.33.3 [INFO] [stderr] Checking colored v2.0.0 [INFO] [stderr] Compiling mime_guess v2.0.3 [INFO] [stderr] Checking parking_lot v0.11.1 [INFO] [stderr] Checking dirs v3.0.1 [INFO] [stderr] Checking float-cmp v0.8.0 [INFO] [stderr] Checking signal-hook v0.1.17 [INFO] [stderr] Compiling mio v0.6.23 [INFO] [stderr] Compiling http-body v0.3.1 [INFO] [stderr] Compiling idna v0.2.0 [INFO] [stderr] Checking crossterm v0.18.2 [INFO] [stderr] Compiling native-tls v0.2.7 [INFO] [stderr] Checking regex v1.4.2 [INFO] [stderr] Checking bzip2 v0.3.3 [INFO] [stderr] Compiling url v2.2.0 [INFO] [stderr] Compiling tokio v0.2.24 [INFO] [stderr] Checking predicates v1.0.6 [INFO] [stderr] Checking assert_cmd v1.0.2 [INFO] [stderr] Compiling tokio-util v0.3.1 [INFO] [stderr] Compiling tokio-tls v0.3.1 [INFO] [stderr] Compiling pin-project-internal v1.0.2 [INFO] [stderr] Compiling thiserror-impl v1.0.23 [INFO] [stderr] Compiling structopt-derive v0.4.14 [INFO] [stderr] Compiling strum_macros v0.20.1 [INFO] [stderr] Checking rusqlite v0.24.2 [INFO] [stderr] Compiling thiserror v1.0.23 [INFO] [stderr] Compiling zip v0.5.9 [INFO] [stderr] Checking minus v2.1.0 [INFO] [stderr] Compiling pin-project v1.0.2 [INFO] [stderr] Compiling futures-util v0.3.8 [INFO] [stderr] Checking structopt v0.3.21 [INFO] [stderr] Compiling pin-project v0.4.27 [INFO] [stderr] Compiling tracing-futures v0.2.4 [INFO] [stderr] Compiling h2 v0.2.7 [INFO] [stderr] Compiling bstr v0.2.14 [INFO] [stderr] Compiling serde_urlencoded v0.7.0 [INFO] [stderr] Compiling csv v1.1.5 [INFO] [stderr] Compiling hyper v0.13.9 [INFO] [stderr] Compiling hyper-tls v0.4.3 [INFO] [stderr] Compiling reqwest v0.10.10 [INFO] [stderr] Compiling chr v1.0.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: field is never read: `codepoint` [INFO] [stdout] --> build.rs:286:5 [INFO] [stdout] | [INFO] [stdout] 286 | codepoint: u32, [INFO] [stdout] | ^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] error: failed to run custom build command for `chr v1.0.0 (/opt/rustwide/workdir)` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/target/debug/build/chr-61bc9cbd55ba6e43/build-script-build` (exit status: 101) [INFO] [stderr] --- stderr [INFO] [stderr] thread 'main' panicked at 'File download failed: reqwest::Error { kind: Request, url: Url { scheme: "http", host: Some(Domain("ftp.unicode.org")), port: None, path: "/Public/13.0.0/ucd/Blocks.txt", query: None, fragment: None }, source: hyper::Error(Connect, ConnectError("dns error", Custom { kind: Other, error: "failed to lookup address information: Temporary failure in name resolution" })) }', build.rs:71:18 [INFO] [stderr] stack backtrace: [INFO] [stderr] 0: 0x55b56a183ec0 - std::backtrace_rs::backtrace::libunwind::trace::hec7eaac9435d3512 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5 [INFO] [stderr] 1: 0x55b56a183ec0 - std::backtrace_rs::backtrace::trace_unsynchronized::h42791b8fa12b7daa [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 [INFO] [stderr] 2: 0x55b56a183ec0 - std::sys_common::backtrace::_print_fmt::h3da3ebe04fb665a8 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/sys_common/backtrace.rs:67:5 [INFO] [stderr] 3: 0x55b56a183ec0 - ::fmt::he40bcdde3c4491cd [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/sys_common/backtrace.rs:46:22 [INFO] [stderr] 4: 0x55b56a1a452f - core::fmt::write::h2c729149c08098ab [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/core/src/fmt/mod.rs:1094:17 [INFO] [stderr] 5: 0x55b56a17ec65 - std::io::Write::write_fmt::h28e0f2f58b8d7b7e [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/io/mod.rs:1578:15 [INFO] [stderr] 6: 0x55b56a185e2b - std::sys_common::backtrace::_print::h7f0223b1e3d898fc [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/sys_common/backtrace.rs:49:5 [INFO] [stderr] 7: 0x55b56a185e2b - std::sys_common::backtrace::print::h58edd634a14c2d4c [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/sys_common/backtrace.rs:36:9 [INFO] [stderr] 8: 0x55b56a185e2b - std::panicking::default_hook::{{closure}}::h71657a7591430164 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panicking.rs:208:50 [INFO] [stderr] 9: 0x55b56a18590d - std::panicking::default_hook::hcdf4eb5db072c85b [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panicking.rs:225:9 [INFO] [stderr] 10: 0x55b56a1863dd - std::panicking::rust_panic_with_hook::hfb91e961ffb5b8e0 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panicking.rs:591:17 [INFO] [stderr] 11: 0x55b56a185fd7 - std::panicking::begin_panic_handler::{{closure}}::h984d540e84311150 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panicking.rs:497:13 [INFO] [stderr] 12: 0x55b56a18435c - std::sys_common::backtrace::__rust_end_short_backtrace::h32354258ff2aecd1 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/sys_common/backtrace.rs:141:18 [INFO] [stderr] 13: 0x55b56a185f39 - rust_begin_unwind [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panicking.rs:493:5 [INFO] [stderr] 14: 0x55b569b19791 - core::panicking::panic_fmt::he3827412471ccbb1 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/core/src/panicking.rs:92:14 [INFO] [stderr] 15: 0x55b569b19883 - core::result::unwrap_failed::h6e66654d198da7bd [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/core/src/result.rs:1355:5 [INFO] [stderr] 16: 0x55b569b520f7 - core::result::Result::expect::h377c3a7da1607900 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/core/src/result.rs:997:23 [INFO] [stderr] 17: 0x55b569b36777 - build_script_build::download_files::h610e12be5c107448 [INFO] [stderr] at /opt/rustwide/workdir/build.rs:68:33 [INFO] [stderr] 18: 0x55b569b3617b - build_script_build::main::h582761aba2ed2e6a [INFO] [stderr] at /opt/rustwide/workdir/build.rs:44:5 [INFO] [stderr] 19: 0x55b569b2556b - core::ops::function::FnOnce::call_once::he665bdb422e95841 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/core/src/ops/function.rs:227:5 [INFO] [stderr] 20: 0x55b569b45e5e - std::sys_common::backtrace::__rust_begin_short_backtrace::h47da4c1595ed20cc [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/sys_common/backtrace.rs:125:18 [INFO] [stderr] 21: 0x55b569b32fd1 - std::rt::lang_start::{{closure}}::hdec34ff05c85943d [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/rt.rs:66:18 [INFO] [stderr] 22: 0x55b56a1868da - core::ops::function::impls:: for &F>::call_once::hd5953dadf0bc8f54 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/core/src/ops/function.rs:259:13 [INFO] [stderr] 23: 0x55b56a1868da - std::panicking::try::do_call::h23b369f1996fb7d4 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panicking.rs:379:40 [INFO] [stderr] 24: 0x55b56a1868da - std::panicking::try::he017ee9ed6bce192 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panicking.rs:343:19 [INFO] [stderr] 25: 0x55b56a1868da - std::panic::catch_unwind::hbfb892340a78b30d [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/panic.rs:431:14 [INFO] [stderr] 26: 0x55b56a1868da - std::rt::lang_start_internal::hce6e4c0ce56abb51 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/rt.rs:51:25 [INFO] [stderr] 27: 0x55b569b32fb0 - std::rt::lang_start::hda66e3b40528a0d5 [INFO] [stderr] at /rustc/45d8b6e68beee1c9c1ce92ae258a7e02f8f13aa4/library/std/src/rt.rs:65:5 [INFO] [stderr] 28: 0x55b569b3ff2c - main [INFO] [stderr] 29: 0x7f1828d100b3 - __libc_start_main [INFO] [stderr] 30: 0x55b569b19f2e - _start [INFO] [stderr] 31: 0x0 - [INFO] running `Command { std: "docker" "inspect" "920cfbe464a78c13d484f73d9d3f4aaeab399e6c4e1ebbeb73b48165f78fa48d", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "920cfbe464a78c13d484f73d9d3f4aaeab399e6c4e1ebbeb73b48165f78fa48d", kill_on_drop: false }` [INFO] [stdout] 920cfbe464a78c13d484f73d9d3f4aaeab399e6c4e1ebbeb73b48165f78fa48d