[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 1)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 2)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 3)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 4)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 5)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 6)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 7)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 8)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 9)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 10)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] [stderr] /workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations: No space left on device
[WARN] Retrying crate fetch in 3 seconds (attempt 11)
[INFO] cloning repository https://github.com/yagnadeepxo/polynomial_operations
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yagnadeepxo/polynomial_operations" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 911f25089d882ebd9ab66205947d62754e040b53
[INFO] checking yagnadeepxo/polynomial_operations against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yagnadeepxo/polynomial_operations on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/yagnadeepxo/polynomial_operations
[INFO] finished tweaking git repo https://github.com/yagnadeepxo/polynomial_operations
[INFO] tweaked toml for git repo https://github.com/yagnadeepxo/polynomial_operations written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/yagnadeepxo/polynomial_operations 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aaf109d1ac82aa9e90b7e9134d01cf40e915e37a5345afa44bba0c9afb08a7bc
[INFO] running `Command { std: "docker" "start" "-a" "aaf109d1ac82aa9e90b7e9134d01cf40e915e37a5345afa44bba0c9afb08a7bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aaf109d1ac82aa9e90b7e9134d01cf40e915e37a5345afa44bba0c9afb08a7bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aaf109d1ac82aa9e90b7e9134d01cf40e915e37a5345afa44bba0c9afb08a7bc", kill_on_drop: false }`
[INFO] [stdout] aaf109d1ac82aa9e90b7e9134d01cf40e915e37a5345afa44bba0c9afb08a7bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e0fd3cd88b45fcbe3652d856250fcf0cfead4c5a593d2e56e8fe95017dfe1d7
[INFO] running `Command { std: "docker" "start" "-a" "1e0fd3cd88b45fcbe3652d856250fcf0cfead4c5a593d2e56e8fe95017dfe1d7", kill_on_drop: false }`
[INFO] [stderr]     Checking polynomial_operations v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.08s
[INFO] running `Command { std: "docker" "inspect" "1e0fd3cd88b45fcbe3652d856250fcf0cfead4c5a593d2e56e8fe95017dfe1d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e0fd3cd88b45fcbe3652d856250fcf0cfead4c5a593d2e56e8fe95017dfe1d7", kill_on_drop: false }`
[INFO] [stdout] 1e0fd3cd88b45fcbe3652d856250fcf0cfead4c5a593d2e56e8fe95017dfe1d7
[INFO] checking yagnadeepxo/polynomial_operations against try#36dbcaee1a55543dfc181be52a69d99ff46ff62f for pr-122960-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyagnadeepxo%2Fpolynomial_operations" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yagnadeepxo/polynomial_operations on toolchain 36dbcaee1a55543dfc181be52a69d99ff46ff62f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+36dbcaee1a55543dfc181be52a69d99ff46ff62f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/yagnadeepxo/polynomial_operations
[INFO] finished tweaking git repo https://github.com/yagnadeepxo/polynomial_operations
[INFO] tweaked toml for git repo https://github.com/yagnadeepxo/polynomial_operations written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/yagnadeepxo/polynomial_operations 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" "+36dbcaee1a55543dfc181be52a69d99ff46ff62f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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" "+36dbcaee1a55543dfc181be52a69d99ff46ff62f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 61f4af55a82ffa6575d7988b652d6f26d8af51f6fd6ca5c34e7c05ecbd427629
[INFO] running `Command { std: "docker" "start" "-a" "61f4af55a82ffa6575d7988b652d6f26d8af51f6fd6ca5c34e7c05ecbd427629", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61f4af55a82ffa6575d7988b652d6f26d8af51f6fd6ca5c34e7c05ecbd427629", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61f4af55a82ffa6575d7988b652d6f26d8af51f6fd6ca5c34e7c05ecbd427629", kill_on_drop: false }`
[INFO] [stdout] 61f4af55a82ffa6575d7988b652d6f26d8af51f6fd6ca5c34e7c05ecbd427629
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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" "+36dbcaee1a55543dfc181be52a69d99ff46ff62f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d4694407ffa5f7d883cb8c87da4d61ff3f4ffe3c8b1c218131b53bed3de8c8d
[INFO] running `Command { std: "docker" "start" "-a" "8d4694407ffa5f7d883cb8c87da4d61ff3f4ffe3c8b1c218131b53bed3de8c8d", kill_on_drop: false }`
[INFO] [stderr] Copying to /tmp/fixit
[INFO] [stderr] cp: error writing '/tmp/fixit/.git/objects/30/54ac5b011674fbeb7c036dc1d850a1e951c8b0': No space left on device
[INFO] [stderr] cp: error writing '/tmp/fixit/.git/objects/30/a9a2dd8e1e941993f56a8f4c062a7f3be73143': No space left on device
[INFO] [stderr] cp: cannot create directory '/tmp/fixit/.git/objects/14': No space left on device
[INFO] [stderr] cp: cannot create directory '/tmp/fixit/.git/objects/e0': No space left on device
[INFO] [stderr] cp: cannot create directory '/tmp/fixit/.git/logs': No space left on device
[INFO] [stderr] cp: cannot create directory '/tmp/fixit/src': No space left on device
[INFO] [stderr] cp: cannot create directory '/tmp/fixit/target': No space left on device
[INFO] [stderr] error: process didn't exit successfully: `cp -a . /tmp/fixit` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8d4694407ffa5f7d883cb8c87da4d61ff3f4ffe3c8b1c218131b53bed3de8c8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d4694407ffa5f7d883cb8c87da4d61ff3f4ffe3c8b1c218131b53bed3de8c8d", kill_on_drop: false }`
[INFO] [stdout] 8d4694407ffa5f7d883cb8c87da4d61ff3f4ffe3c8b1c218131b53bed3de8c8d