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Running cargo test produces this result with GST_DEBUG=6 (also without, but very rarely):

failures:

---- logging::gstreamer::test stdout ----
thread 'logging::gstreamer::test' panicked at 'assertion failed: `(left == right)`
  left: `"GST_INIT"`,
 right: `"gst-target"`', src/logging/mod.rs:161:5
stack backtrace:
   0:     0x559ffccde1d4 - backtrace::backtrace::libunwind::trace::hda41dbcdfba36aa0
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/libunwind.rs:88
   1:     0x559ffccde1d4 - backtrace::backtrace::trace_unsynchronized::h1a8d6e1f8cb3f5d4
                               at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.37/src/backtrace/mod.rs:66
   2:     0x559ffccde1d4 - std::sys_common::backtrace::_print_fmt::h610c4127487e10da
                               at src/libstd/sys_common/backtrace.rs:76
   3:     0x559ffccde1d4 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h0722dc552e01bd1d
                               at src/libstd/sys_common/backtrace.rs:60
   4:     0x559ffccfd53c - core::fmt::write::h01edf6dd68a42c9c
                               at src/libcore/fmt/mod.rs:1030
   5:     0x559ffcc0d905 - std::io::Write::write_fmt::hd48b46e5c13c6612
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/io/mod.rs:1412
   6:     0x559ffccd9d01 - std::io::impls::<impl std::io::Write for alloc::boxed::Box<W>>::write_fmt::hc4feb234d1aa0439
                               at src/libstd/io/impls.rs:141
   7:     0x559ffcce06e5 - std::sys_common::backtrace::_print::hd8d5d08a1795e743
                               at src/libstd/sys_common/backtrace.rs:64
   8:     0x559ffcce06e5 - std::sys_common::backtrace::print::hf89a79e3921a2366
                               at src/libstd/sys_common/backtrace.rs:49
   9:     0x559ffcce06e5 - std::panicking::default_hook::{{closure}}::h3a8f42beb3bb8ae3
                               at src/libstd/panicking.rs:196
  10:     0x559ffcce036c - std::panicking::default_hook::h8f803b0bc31a5c37
                               at src/libstd/panicking.rs:207
  11:     0x559ffcce0de5 - std::panicking::rust_panic_with_hook::h825f041245da8739
                               at src/libstd/panicking.rs:473
  12:     0x559ffcce0982 - std::panicking::continue_panic_fmt::hbe0378e33481e81b
                               at src/libstd/panicking.rs:380
  13:     0x559ffcce08dc - std::panicking::begin_panic_fmt::hecb5f06c798651bd
                               at src/libstd/panicking.rs:335
  17:     0x559ffcba4afe - core::ops::function::FnOnce::call_once::h644be279b4b7ed47
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/ops/function.rs:227
  18:     0x559ffcc177ff - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h60313ef8cd80fa37
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/liballoc/boxed.rs:922
  19:     0x559ffcce353a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:80
  20:     0x559ffcc3200e - std::panicking::try::h218111062acbd8af
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/panicking.rs:271
  21:     0x559ffcc3200e - std::panic::catch_unwind::hb43bd7e3eefd561b
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/panic.rs:394
  22:     0x559ffcc3200e - test::run_test::run_test_inner::{{closure}}::h61999fd5b32b527c
                               at src/libtest/lib.rs:1413
  23:     0x559ffcc0d075 - std::sys_common::backtrace::__rust_begin_short_backtrace::h94f0165e3063a572
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/sys_common/backtrace.rs:126
  24:     0x559ffcc11275 - std::thread::Builder::spawn_unchecked::{{closure}}::{{closure}}::ha13ef4f272e8d7f5
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/thread/mod.rs:470
  25:     0x559ffcc11275 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::h4be9743fa104fe58
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/panic.rs:315
  26:     0x559ffcc11275 - std::panicking::try::do_call::hc01172ae30fe685a
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/panicking.rs:292
  27:     0x559ffcce353a - __rust_maybe_catch_panic
                               at src/libpanic_unwind/lib.rs:80
  28:     0x559ffcc117e2 - std::panicking::try::h28c280234b112988
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/panicking.rs:271
  29:     0x559ffcc117e2 - std::panic::catch_unwind::h80abb9ed16b7a343
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/panic.rs:394
  30:     0x559ffcc117e2 - std::thread::Builder::spawn_unchecked::{{closure}}::h079ad7fe053e2851
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libstd/thread/mod.rs:469
  31:     0x559ffcc117e2 - core::ops::function::FnOnce::call_once{{vtable.shim}}::h66965f502b707a1a
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/libcore/ops/function.rs:227
  32:     0x559ffccd638f - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h483711add4ba2330
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/liballoc/boxed.rs:922
  33:     0x559ffcce2c70 - <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once::h7605b45eb29ed0be
                               at /rustc/4560ea788cb760f0a34127156c78e2552949f734/src/liballoc/boxed.rs:922
  34:     0x559ffcce2c70 - std::sys_common::thread::start_thread::h557b0c2dc4449562
                               at src/libstd/sys_common/thread.rs:13
  35:     0x559ffcce2c70 - std::sys::unix::thread::Thread::new::thread_start::h7c2a7f9b68fe4bba
                               at src/libstd/sys/unix/thread.rs:79
  36:     0x7f6d433f2fb7 - start_thread
  37:     0x7f6d433082cf - __clone
  38:                0x0 - <unknown>


failures:
    logging::gstreamer::test

test result: FAILED. 16 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out