[INFO] crate uexpr 0.0.1 is already in cache
[INFO] testing uexpr-0.0.1 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate uexpr 0.0.1 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate uexpr 0.0.1 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate uexpr 0.0.1
[INFO] finished tweaking crates.io crate uexpr 0.0.1
[INFO] tweaked toml for crates.io crate uexpr 0.0.1 written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9b0462869891782a62da5c43e96fbbc5cbc3e14d3bf44f6186ae4ae7abbc964c
[INFO] running `"docker" "start" "-a" "9b0462869891782a62da5c43e96fbbc5cbc3e14d3bf44f6186ae4ae7abbc964c"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling uexpr v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:115:20
[INFO] [stderr]     |
[INFO] [stderr] 115 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:253:20
[INFO] [stderr]     |
[INFO] [stderr] 253 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:273:20
[INFO] [stderr]     |
[INFO] [stderr] 273 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:292:20
[INFO] [stderr]     |
[INFO] [stderr] 292 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:326:20
[INFO] [stderr]     |
[INFO] [stderr] 326 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:352:20
[INFO] [stderr]     |
[INFO] [stderr] 352 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:407:20
[INFO] [stderr]     |
[INFO] [stderr] 407 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:423:20
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `"docker" "inspect" "9b0462869891782a62da5c43e96fbbc5cbc3e14d3bf44f6186ae4ae7abbc964c"`
[INFO] running `"docker" "rm" "-f" "9b0462869891782a62da5c43e96fbbc5cbc3e14d3bf44f6186ae4ae7abbc964c"`
[INFO] [stdout] 9b0462869891782a62da5c43e96fbbc5cbc3e14d3bf44f6186ae4ae7abbc964c
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 0670f7e774678badfd5c82031bf781e5949237b7892711842f4f414b3a614886
[INFO] running `"docker" "start" "-a" "0670f7e774678badfd5c82031bf781e5949237b7892711842f4f414b3a614886"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling uexpr v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:115:20
[INFO] [stderr]     |
[INFO] [stderr] 115 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:253:20
[INFO] [stderr]     |
[INFO] [stderr] 253 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:273:20
[INFO] [stderr]     |
[INFO] [stderr] 273 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:292:20
[INFO] [stderr]     |
[INFO] [stderr] 292 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:326:20
[INFO] [stderr]     |
[INFO] [stderr] 326 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:352:20
[INFO] [stderr]     |
[INFO] [stderr] 352 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:407:20
[INFO] [stderr]     |
[INFO] [stderr] 407 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:423:20
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:115:20
[INFO] [stderr]     |
[INFO] [stderr] 115 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:253:20
[INFO] [stderr]     |
[INFO] [stderr] 253 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:273:20
[INFO] [stderr]     |
[INFO] [stderr] 273 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:292:20
[INFO] [stderr]     |
[INFO] [stderr] 292 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:326:20
[INFO] [stderr]     |
[INFO] [stderr] 326 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:352:20
[INFO] [stderr]     |
[INFO] [stderr] 352 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:407:20
[INFO] [stderr]     |
[INFO] [stderr] 407 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:423:20
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.57s
[INFO] running `"docker" "inspect" "0670f7e774678badfd5c82031bf781e5949237b7892711842f4f414b3a614886"`
[INFO] running `"docker" "rm" "-f" "0670f7e774678badfd5c82031bf781e5949237b7892711842f4f414b3a614886"`
[INFO] [stdout] 0670f7e774678badfd5c82031bf781e5949237b7892711842f4f414b3a614886
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] cfe2feb9abf318980c579e523ad800def7cd9f49853864008a9ff70f59dd4dd6
[INFO] running `"docker" "start" "-a" "cfe2feb9abf318980c579e523ad800def7cd9f49853864008a9ff70f59dd4dd6"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:115:20
[INFO] [stderr]     |
[INFO] [stderr] 115 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:253:20
[INFO] [stderr]     |
[INFO] [stderr] 253 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:273:20
[INFO] [stderr]     |
[INFO] [stderr] 273 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:292:20
[INFO] [stderr]     |
[INFO] [stderr] 292 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:326:20
[INFO] [stderr]     |
[INFO] [stderr] 326 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:352:20
[INFO] [stderr]     |
[INFO] [stderr] 352 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:407:20
[INFO] [stderr]     |
[INFO] [stderr] 407 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:423:20
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:115:20
[INFO] [stderr]     |
[INFO] [stderr] 115 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:253:20
[INFO] [stderr]     |
[INFO] [stderr] 253 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:273:20
[INFO] [stderr]     |
[INFO] [stderr] 273 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:292:20
[INFO] [stderr]     |
[INFO] [stderr] 292 |                 '0'...'9' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:326:20
[INFO] [stderr]     |
[INFO] [stderr] 326 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:352:20
[INFO] [stderr]     |
[INFO] [stderr] 352 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:407:20
[INFO] [stderr]     |
[INFO] [stderr] 407 |                 'a'...'z' => continue,
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/tokenizer.rs:423:20
[INFO] [stderr]     |
[INFO] [stderr] 423 |                 '0'...'9' => {
[INFO] [stderr]     |                    ^^^ help: use `..=` for an inclusive range
[INFO] [stderr] 
[INFO] [stderr] warning: 8 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/uexpr-f164dd8314dbb747
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test tokenizer::tests::prefixed_element_leaf_uexpressions_produce_prefixed_element_tokens ... ok
[INFO] [stdout] test tokenizer::tests::whitespace_uexpresions_produce_no_tokens ... ok
[INFO] [stdout] test tokenizer::tests::int_leaf_uexpressions_produce_valueint_tokens ... ok
[INFO] [stdout] test tokenizer::tests::element_leaf_uexpressions_produce_element_tokens ... ok
[INFO] [stdout] test tokenizer::tests::float_leaf_uexpressions_produce_valuefloat_tokens ... ok
[INFO] [stdout] test tokenizer::tests::uint_leaf_uexpressions_produce_valueuint_tokens ... ok
[INFO] [stdout] test tokenizer::tests::string_leaf_uexpressions_produce_valuestring_tokens ... ok
[INFO] [stdout] test tokenizer::tests::boolean_leaf_uexpressions_produce_valuebool_tokens ... ok
[INFO] [stdout] test tokenizer::tests::element_parent_uexpressions_produce_element_and_leaf_tokens ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/uexpr_tokens_repl-b7f301916aace5bc
[INFO] [stderr]    Doc-tests uexpr
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "cfe2feb9abf318980c579e523ad800def7cd9f49853864008a9ff70f59dd4dd6"`
[INFO] running `"docker" "rm" "-f" "cfe2feb9abf318980c579e523ad800def7cd9f49853864008a9ff70f59dd4dd6"`
[INFO] [stdout] cfe2feb9abf318980c579e523ad800def7cd9f49853864008a9ff70f59dd4dd6