[INFO] cloning repository https://github.com/CJones217/rusty_chain [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CJones217/rusty_chain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCJones217%2Frusty_chain", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCJones217%2Frusty_chain'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] 16b37d34584032554afd8379e76a31a492f6659f [INFO] testing CJones217/rusty_chain against try#eafdee2dfae8c2233b74f98b123308be7ccefcc6 for pr-79296 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCJones217%2Frusty_chain" "/workspace/builds/worker-3/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-3/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/CJones217/rusty_chain on toolchain eafdee2dfae8c2233b74f98b123308be7ccefcc6 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/CJones217/rusty_chain [INFO] finished tweaking git repo https://github.com/CJones217/rusty_chain [INFO] tweaked toml for git repo https://github.com/CJones217/rusty_chain written to /workspace/builds/worker-3/source/Cargo.toml [INFO] crate git repo https://github.com/CJones217/rusty_chain already has a lockfile, it will not be regenerated [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] warning: unused manifest key: lib.psth [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "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] 203fb68ad77e644ed07ec639e1ce2067a2cc98cec3fd8c80d190b1cdfaaed356 [INFO] running `Command { std: "docker" "start" "-a" "203fb68ad77e644ed07ec639e1ce2067a2cc98cec3fd8c80d190b1cdfaaed356", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "203fb68ad77e644ed07ec639e1ce2067a2cc98cec3fd8c80d190b1cdfaaed356", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "203fb68ad77e644ed07ec639e1ce2067a2cc98cec3fd8c80d190b1cdfaaed356", kill_on_drop: false }` [INFO] [stdout] 203fb68ad77e644ed07ec639e1ce2067a2cc98cec3fd8c80d190b1cdfaaed356 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "build" "--frozen" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] d3896ca4dce9245c37568d68131cd82df9fc847e9895174be593fc82780531cc [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" "d3896ca4dce9245c37568d68131cd82df9fc847e9895174be593fc82780531cc", kill_on_drop: false }` [INFO] [stderr] warning: unused manifest key: lib.psth [INFO] [stderr] Compiling cc v1.0.47 [INFO] [stderr] Compiling openssl v0.10.25 [INFO] [stderr] Compiling hex v0.3.2 [INFO] [stderr] Compiling hex v0.4.2 [INFO] [stderr] Compiling openssl-sys v0.9.52 [INFO] [stderr] Compiling crypto-hash v0.3.4 [INFO] [stderr] Compiling rusty_chain v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `hex::*` [INFO] [stdout] --> src/block.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use hex::*; [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `timeStamp` should have a snake case name [INFO] [stdout] --> src/block.rs:9:9 [INFO] [stdout] | [INFO] [stdout] 9 | pub timeStamp: u128 , //time block is created [INFO] [stdout] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `lastBlockHash` should have a snake case name [INFO] [stdout] --> src/block.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | pub lastBlockHash: BlockHash, //hash of the previous block in blockchain [INFO] [stdout] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `timeStamp` should have a snake case name [INFO] [stdout] --> src/block.rs:25:28 [INFO] [stdout] | [INFO] [stdout] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stdout] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `lastBlockHash` should have a snake case name [INFO] [stdout] --> src/block.rs:25:45 [INFO] [stdout] | [INFO] [stdout] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stdout] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 14.09s [INFO] running `Command { std: "docker" "inspect" "d3896ca4dce9245c37568d68131cd82df9fc847e9895174be593fc82780531cc", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d3896ca4dce9245c37568d68131cd82df9fc847e9895174be593fc82780531cc", kill_on_drop: false }` [INFO] [stdout] d3896ca4dce9245c37568d68131cd82df9fc847e9895174be593fc82780531cc [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "test" "--frozen" "--no-run" "--message-format=json", 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] 2749a56ff79a0141ee5b8be6aaed805af447e257099f158b453975fe57164ddd [INFO] running `Command { std: "docker" "start" "-a" "2749a56ff79a0141ee5b8be6aaed805af447e257099f158b453975fe57164ddd", kill_on_drop: false }` [INFO] [stderr] warning: unused manifest key: lib.psth [INFO] [stderr] Compiling rusty_chain v0.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: unused import: `hex::*` [INFO] [stdout] --> src/block.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use hex::*; [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `timeStamp` should have a snake case name [INFO] [stdout] --> src/block.rs:9:9 [INFO] [stdout] | [INFO] [stdout] 9 | pub timeStamp: u128 , //time block is created [INFO] [stdout] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `lastBlockHash` should have a snake case name [INFO] [stdout] --> src/block.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | pub lastBlockHash: BlockHash, //hash of the previous block in blockchain [INFO] [stdout] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `timeStamp` should have a snake case name [INFO] [stdout] --> src/block.rs:25:28 [INFO] [stdout] | [INFO] [stdout] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stdout] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `lastBlockHash` should have a snake case name [INFO] [stdout] --> src/block.rs:25:45 [INFO] [stdout] | [INFO] [stdout] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stdout] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: unused import: `hex::*` [INFO] [stdout] --> src/block.rs:4:5 [INFO] [stdout] | [INFO] [stdout] 4 | use hex::*; [INFO] [stdout] | ^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `timeStamp` should have a snake case name [INFO] [stdout] --> src/block.rs:9:9 [INFO] [stdout] | [INFO] [stdout] 9 | pub timeStamp: u128 , //time block is created [INFO] [stdout] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(non_snake_case)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: structure field `lastBlockHash` should have a snake case name [INFO] [stdout] --> src/block.rs:11:9 [INFO] [stdout] | [INFO] [stdout] 11 | pub lastBlockHash: BlockHash, //hash of the previous block in blockchain [INFO] [stdout] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `timeStamp` should have a snake case name [INFO] [stdout] --> src/block.rs:25:28 [INFO] [stdout] | [INFO] [stdout] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stdout] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable `lastBlockHash` should have a snake case name [INFO] [stdout] --> src/block.rs:25:45 [INFO] [stdout] | [INFO] [stdout] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stdout] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 5 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 1.18s [INFO] running `Command { std: "docker" "inspect" "2749a56ff79a0141ee5b8be6aaed805af447e257099f158b453975fe57164ddd", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2749a56ff79a0141ee5b8be6aaed805af447e257099f158b453975fe57164ddd", kill_on_drop: false }` [INFO] [stdout] 2749a56ff79a0141ee5b8be6aaed805af447e257099f158b453975fe57164ddd [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+eafdee2dfae8c2233b74f98b123308be7ccefcc6" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 2c8277bc34a5dfad00a4dfa773866aca9b8e5eb20da6d6e23145cac90673c5a6 [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" "2c8277bc34a5dfad00a4dfa773866aca9b8e5eb20da6d6e23145cac90673c5a6", kill_on_drop: false }` [INFO] [stderr] warning: unused manifest key: lib.psth [INFO] [stderr] warning: unused import: `hex::*` [INFO] [stderr] --> src/block.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use hex::*; [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: structure field `timeStamp` should have a snake case name [INFO] [stderr] --> src/block.rs:9:9 [INFO] [stderr] | [INFO] [stderr] 9 | pub timeStamp: u128 , //time block is created [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: structure field `lastBlockHash` should have a snake case name [INFO] [stderr] --> src/block.rs:11:9 [INFO] [stderr] | [INFO] [stderr] 11 | pub lastBlockHash: BlockHash, //hash of the previous block in blockchain [INFO] [stderr] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stderr] [INFO] [stderr] warning: variable `timeStamp` should have a snake case name [INFO] [stderr] --> src/block.rs:25:28 [INFO] [stderr] | [INFO] [stderr] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stderr] [INFO] [stderr] warning: variable `lastBlockHash` should have a snake case name [INFO] [stderr] --> src/block.rs:25:45 [INFO] [stderr] | [INFO] [stderr] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stderr] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stderr] [INFO] [stderr] warning: 5 warnings emitted [INFO] [stderr] [INFO] [stderr] warning: unused import: `hex::*` [INFO] [stderr] --> src/block.rs:4:5 [INFO] [stderr] | [INFO] [stderr] 4 | use hex::*; [INFO] [stderr] | ^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: structure field `timeStamp` should have a snake case name [INFO] [stderr] --> src/block.rs:9:9 [INFO] [stderr] | [INFO] [stderr] 9 | pub timeStamp: u128 , //time block is created [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(non_snake_case)]` on by default [INFO] [stderr] [INFO] [stderr] warning: structure field `lastBlockHash` should have a snake case name [INFO] [stderr] --> src/block.rs:11:9 [INFO] [stderr] | [INFO] [stderr] 11 | pub lastBlockHash: BlockHash, //hash of the previous block in blockchain [INFO] [stderr] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stderr] [INFO] [stderr] warning: variable `timeStamp` should have a snake case name [INFO] [stderr] --> src/block.rs:25:28 [INFO] [stderr] | [INFO] [stderr] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stderr] | ^^^^^^^^^ help: convert the identifier to snake case: `time_stamp` [INFO] [stderr] [INFO] [stderr] warning: variable `lastBlockHash` should have a snake case name [INFO] [stderr] --> src/block.rs:25:45 [INFO] [stderr] | [INFO] [stderr] 25 | pub fn new(index: u32, timeStamp: u128, lastBlockHash: BlockHash, nonce: u32, payload: String) -> Self{ [INFO] [stderr] | ^^^^^^^^^^^^^ help: convert the identifier to snake case: `last_block_hash` [INFO] [stderr] [INFO] [stderr] warning: 5 warnings emitted [INFO] [stderr] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.03s [INFO] [stderr] Running /opt/rustwide/target/debug/deps/rustychainlib-b81ca84106097131 [INFO] [stdout] [INFO] [stderr] Running /opt/rustwide/target/debug/deps/rusty_chain-d36949583a55863d [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] Doc-tests rustychainlib [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] [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 `Command { std: "docker" "inspect" "2c8277bc34a5dfad00a4dfa773866aca9b8e5eb20da6d6e23145cac90673c5a6", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "2c8277bc34a5dfad00a4dfa773866aca9b8e5eb20da6d6e23145cac90673c5a6", kill_on_drop: false }` [INFO] [stdout] 2c8277bc34a5dfad00a4dfa773866aca9b8e5eb20da6d6e23145cac90673c5a6