[INFO] fetching crate binserde 0.1.6... [INFO] testing binserde-0.1.6 against try#d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2 for pr-86479 [INFO] extracting crate binserde 0.1.6 into /workspace/builds/worker-13/source [INFO] validating manifest of crates.io crate binserde 0.1.6 on toolchain d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2 [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking crates.io crate binserde 0.1.6 [INFO] finished tweaking crates.io crate binserde 0.1.6 [INFO] tweaked toml for crates.io crate binserde 0.1.6 written to /workspace/builds/worker-13/source/Cargo.toml [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }` [INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded binserde_derive v0.1.4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "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] 10ebea2a5b0c9ac8f79215a844d6542cc9dba4ecc9a46bf1436a91ccdd32cc32 [INFO] running `Command { std: "docker" "start" "-a" "10ebea2a5b0c9ac8f79215a844d6542cc9dba4ecc9a46bf1436a91ccdd32cc32", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "10ebea2a5b0c9ac8f79215a844d6542cc9dba4ecc9a46bf1436a91ccdd32cc32", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "10ebea2a5b0c9ac8f79215a844d6542cc9dba4ecc9a46bf1436a91ccdd32cc32", kill_on_drop: false }` [INFO] [stdout] 10ebea2a5b0c9ac8f79215a844d6542cc9dba4ecc9a46bf1436a91ccdd32cc32 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "build" "--frozen" "--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] 64ad2541897aab44221e74ee0bc4f219d145d3fa62a9758c6ad364993bb7605b [INFO] running `Command { std: "docker" "start" "-a" "64ad2541897aab44221e74ee0bc4f219d145d3fa62a9758c6ad364993bb7605b", kill_on_drop: false }` [INFO] [stderr] Compiling syn v1.0.74 [INFO] [stderr] Compiling fnv v1.0.7 [INFO] [stderr] Compiling strsim v0.9.3 [INFO] [stderr] Compiling ident_case v1.0.1 [INFO] [stderr] Compiling darling_core v0.10.2 [INFO] [stderr] Compiling thiserror-impl v1.0.26 [INFO] [stderr] Compiling darling_macro v0.10.2 [INFO] [stderr] Compiling thiserror v1.0.26 [INFO] [stderr] Compiling darling v0.10.2 [INFO] [stderr] Compiling binserde_derive v0.1.4 [INFO] [stderr] Compiling binserde v0.1.6 (/opt/rustwide/workdir) [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/util.rs:54:29 [INFO] [stdout] | [INFO] [stdout] 54 | pub fn serialize_iter(mut iter: I, mut serializer: S) -> Result<()> [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 32.40s [INFO] running `Command { std: "docker" "inspect" "64ad2541897aab44221e74ee0bc4f219d145d3fa62a9758c6ad364993bb7605b", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "64ad2541897aab44221e74ee0bc4f219d145d3fa62a9758c6ad364993bb7605b", kill_on_drop: false }` [INFO] [stdout] 64ad2541897aab44221e74ee0bc4f219d145d3fa62a9758c6ad364993bb7605b [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] d18737f7a405fb5fafe8fd26a53a84982a3cb8755dd2e48779815bade40a57b3 [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" "d18737f7a405fb5fafe8fd26a53a84982a3cb8755dd2e48779815bade40a57b3", kill_on_drop: false }` [INFO] [stderr] Compiling binserde v0.1.6 (/opt/rustwide/workdir) [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/util.rs:54:29 [INFO] [stdout] | [INFO] [stdout] 54 | pub fn serialize_iter(mut iter: I, mut serializer: S) -> Result<()> [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: variable does not need to be mutable [INFO] [stdout] --> src/util.rs:54:29 [INFO] [stdout] | [INFO] [stdout] 54 | pub fn serialize_iter(mut iter: I, mut serializer: S) -> Result<()> [INFO] [stdout] | ----^^^^ [INFO] [stdout] | | [INFO] [stdout] | help: remove this `mut` [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_mut)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 3.59s [INFO] running `Command { std: "docker" "inspect" "d18737f7a405fb5fafe8fd26a53a84982a3cb8755dd2e48779815bade40a57b3", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "d18737f7a405fb5fafe8fd26a53a84982a3cb8755dd2e48779815bade40a57b3", kill_on_drop: false }` [INFO] [stdout] d18737f7a405fb5fafe8fd26a53a84982a3cb8755dd2e48779815bade40a57b3 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2" "test" "--frozen", kill_on_drop: false }` [INFO] [stdout] 8086090a715c31734b42b9ca578318163b8aa6331e2706d166ec56100515bc6f [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" "8086090a715c31734b42b9ca578318163b8aa6331e2706d166ec56100515bc6f", kill_on_drop: false }` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/util.rs:54:29 [INFO] [stderr] | [INFO] [stderr] 54 | pub fn serialize_iter(mut iter: I, mut serializer: S) -> Result<()> [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: `binserde` (lib) generated 1 warning [INFO] [stderr] warning: `binserde` (lib test) generated 1 warning (1 duplicate) [INFO] [stderr] Finished test [unoptimized + debuginfo] target(s) in 0.96s [INFO] [stderr] Running unittests (/opt/rustwide/target/debug/deps/binserde-e4cd5693f30abdf8) [INFO] [stdout] [INFO] [stdout] running 4 tests [INFO] [stdout] test test::serialize_constant_output ... ok [INFO] [stdout] test test::serialize_inline_test ... ok [INFO] [stdout] test varint::test::test_encode_min ... ok [INFO] [stderr] Doc-tests binserde [INFO] [stdout] test varint::test::test_varint ... ok [INFO] [stdout] [INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.01s [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] running 5 tests [INFO] [stdout] test src/lib.rs - (line 132) ... ok [INFO] [stdout] test src/lib.rs - (line 121) ... ok [INFO] [stdout] test src/lib.rs - (line 97) ... ok [INFO] [stdout] test src/lib.rs - (line 72) ... FAILED [INFO] [stdout] test src/lib.rs - (line 18) ... ok [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] [INFO] [stdout] ---- src/lib.rs - (line 72) stdout ---- [INFO] [stdout] Test executable failed (exit code 101). [INFO] [stdout] [INFO] [stdout] stderr: [INFO] [stdout] thread 'main' panicked at 'assertion failed: `(left == right)` [INFO] [stdout] left: `[2, 3, 0, 1]`, [INFO] [stdout] right: `[0, 1, 2, 3]`', src/lib.rs:17:1 [INFO] [stdout] stack backtrace: [INFO] [stdout] 0: 0x55fb499dc270 - std::backtrace_rs::backtrace::libunwind::trace::h99dbb39dca18857d [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5 [INFO] [stdout] 1: 0x55fb499dc270 - std::backtrace_rs::backtrace::trace_unsynchronized::h832861927e9cfedf [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5 [INFO] [stdout] 2: 0x55fb499dc270 - std::sys_common::backtrace::_print_fmt::h3d18154c77dcf310 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/sys_common/backtrace.rs:67:5 [INFO] [stdout] 3: 0x55fb499dc270 - ::fmt::he312f4ad5b9bb346 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/sys_common/backtrace.rs:46:22 [INFO] [stdout] 4: 0x55fb499f5d6c - core::fmt::write::h9a6d9c74526a6c1b [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/core/src/fmt/mod.rs:1115:17 [INFO] [stdout] 5: 0x55fb499dad05 - std::io::Write::write_fmt::h6aced00850e8186f [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/io/mod.rs:1665:15 [INFO] [stdout] 6: 0x55fb499ddeab - std::sys_common::backtrace::_print::h65d996766de40da4 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/sys_common/backtrace.rs:49:5 [INFO] [stdout] 7: 0x55fb499ddeab - std::sys_common::backtrace::print::h40df9727e635f303 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/sys_common/backtrace.rs:36:9 [INFO] [stdout] 8: 0x55fb499ddeab - std::panicking::default_hook::{{closure}}::hd2da4327dea91a51 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:208:50 [INFO] [stdout] 9: 0x55fb499dd981 - std::panicking::default_hook::h3d55120ad6ada158 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:225:9 [INFO] [stdout] 10: 0x55fb499de574 - std::panicking::rust_panic_with_hook::hf85dd0bb545e3b55 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:622:17 [INFO] [stdout] 11: 0x55fb499de057 - std::panicking::begin_panic_handler::{{closure}}::h736ae969434da9fa [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:519:13 [INFO] [stdout] 12: 0x55fb499dc74c - std::sys_common::backtrace::__rust_end_short_backtrace::h6133bb80b1d6c3e0 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/sys_common/backtrace.rs:141:18 [INFO] [stdout] 13: 0x55fb499ddfb9 - rust_begin_unwind [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:515:5 [INFO] [stdout] 14: 0x55fb499b6ea1 - core::panicking::panic_fmt::hcf5f6d96e1dd7099 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/core/src/panicking.rs:92:14 [INFO] [stdout] 15: 0x55fb499f5028 - core::panicking::assert_failed_inner::h6ded2444c01d76f2 [INFO] [stdout] 16: 0x55fb499bfa4a - core::panicking::assert_failed::h7dcec6604143f4fb [INFO] [stdout] 17: 0x55fb499c836c - rust_out::main::_doctest_main_src_lib_rs_72_0::h97acab78373fd541 [INFO] [stdout] 18: 0x55fb499c8246 - rust_out::main::h61823b600df25383 [INFO] [stdout] 19: 0x55fb499b9a03 - core::ops::function::FnOnce::call_once::h6cb22c19cf103035 [INFO] [stdout] 20: 0x55fb499b8949 - std::sys_common::backtrace::__rust_begin_short_backtrace::h637ba5cce8c91c49 [INFO] [stdout] 21: 0x55fb499b9139 - std::rt::lang_start::{{closure}}::h712a4ed327341491 [INFO] [stdout] 22: 0x55fb499dea7a - core::ops::function::impls:: for &F>::call_once::h5a0483c8d4e9c15d [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/core/src/ops/function.rs:259:13 [INFO] [stdout] 23: 0x55fb499dea7a - std::panicking::try::do_call::h6ad7918f175f6ddd [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:401:40 [INFO] [stdout] 24: 0x55fb499dea7a - std::panicking::try::hcd5af58f52320690 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:365:19 [INFO] [stdout] 25: 0x55fb499dea7a - std::panic::catch_unwind::hf1ae33ba67228f1e [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panic.rs:434:14 [INFO] [stdout] 26: 0x55fb499dea7a - std::rt::lang_start_internal::{{closure}}::h4a87bc0aa1312dc5 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/rt.rs:45:48 [INFO] [stdout] 27: 0x55fb499dea7a - std::panicking::try::do_call::h1ade2a52932fc900 [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:401:40 [INFO] [stdout] 28: 0x55fb499dea7a - std::panicking::try::h6f4a87ad169e174b [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panicking.rs:365:19 [INFO] [stdout] 29: 0x55fb499dea7a - std::panic::catch_unwind::h043c7f08019f9e2a [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/panic.rs:434:14 [INFO] [stdout] 30: 0x55fb499dea7a - std::rt::lang_start_internal::h82825699ebfd70bd [INFO] [stdout] at /rustc/d2e9fff28e244f1ea4927194f1f9b77f93e2ffe2/library/std/src/rt.rs:45:20 [INFO] [stdout] 31: 0x55fb499b9111 - std::rt::lang_start::h7f3abfe234c3922d [INFO] [stdout] 32: 0x55fb499c8b63 - main [INFO] [stdout] 33: 0x7f037f16e0b3 - __libc_start_main [INFO] [stdout] 34: 0x55fb499b75fe - _start [INFO] [stdout] 35: 0x0 - [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] failures: [INFO] [stdout] src/lib.rs - (line 72) [INFO] [stdout] [INFO] [stdout] test result: FAILED. 4 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.79s [INFO] [stdout] [INFO] [stderr] error: test failed, to rerun pass '--doc' [INFO] running `Command { std: "docker" "inspect" "8086090a715c31734b42b9ca578318163b8aa6331e2706d166ec56100515bc6f", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8086090a715c31734b42b9ca578318163b8aa6331e2706d166ec56100515bc6f", kill_on_drop: false }` [INFO] [stdout] 8086090a715c31734b42b9ca578318163b8aa6331e2706d166ec56100515bc6f