Panic: calls to push_pos() in states that don't end up emitting events

[djrodgerspryor]

I ran into a dev mode panic when parsing some XML via yaserde (using the latest version: 0.8.22).

[FATAL][panic] thread 'main' panicked at 'You've found a bug in xml-rs, caused by calls to push_pos() in states that don't end up emitting events.
            This case is ignored in release mode, and merely causes document positions to be out of sync.
            Please file a bug and include the XML document that triggers this assert.': /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xml-rs-0.8.22/src/reader/parser/outside_tag.rs:109
   0: backtrace::backtrace::libunwind::trace
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/backtrace-0.3.68/src/backtrace/libunwind.rs:93:5
      backtrace::backtrace::trace_unsynchronized
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/backtrace-0.3.68/src/backtrace/mod.rs:66:5
   1: backtrace::backtrace::trace
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/backtrace-0.3.68/src/backtrace/mod.rs:53:14
   2: backtrace::capture::Backtrace::create
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/backtrace-0.3.68/src/capture.rs:176:9
   3: backtrace::capture::Backtrace::new
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/backtrace-0.3.68/src/capture.rs:140:22
   4: <backtrace::capture::Backtrace as core::default::Default>::default
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/backtrace-0.3.68/src/capture.rs:410:9
   5: log_panics::Config::install_panic_hook::{{closure}}
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/log-panics-2.1.0/src/lib.rs:115:29
   6: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/alloc/src/boxed.rs:2034:9
      std::panicking::rust_panic_with_hook
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:783:13
   7: std::panicking::begin_panic_handler::{{closure}}
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:649:13
   8: std::sys_common::backtrace::__rust_end_short_backtrace
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys_common/backtrace.rs:171:18
   9: rust_begin_unwind
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:645:5
  10: core::panicking::panic_fmt
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/panicking.rs:72:14
  11: xml::reader::parser::PullParser::push_pos
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xml-rs-0.8.22/src/reader/parser.rs:424:9
  12: xml::reader::parser::outside_tag::<impl xml::reader::parser::PullParser>::outside_tag
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xml-rs-0.8.22/src/reader/parser/outside_tag.rs:109:21
  13: xml::reader::parser::PullParser::dispatch_token
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xml-rs-0.8.22/src/reader/parser.rs:439:54
  14: xml::reader::parser::PullParser::next
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xml-rs-0.8.22/src/reader/parser.rs:352:36
  15: xml::reader::EventReader<R>::next
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/xml-rs-0.8.22/src/reader.rs:53:9
  16: yaserde::de::Deserializer<R>::inner_next
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/yaserde-0.11.1/src/de/mod.rs:57:13
  17: yaserde::de::Deserializer<R>::peek
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/yaserde-0.11.1/src/de/mod.rs:45:26
  18: autocast::collections::in_the_pipeline::_IMPL_YA_DESERIALIZE_FOR_Item::<impl yaserde::YaDeserialize for autocast::collections::in_the_pipeline::Item>::deserialize::{{closure}}
             at src/collections/in_the_pipeline.rs:144:55
  19: yaserde::de::Deserializer<R>::read_inner_value
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/yaserde-0.11.1/src/de/mod.rs:111:20
  20: autocast::collections::in_the_pipeline::_IMPL_YA_DESERIALIZE_FOR_Item::<impl yaserde::YaDeserialize for autocast::collections::in_the_pipeline::Item>::deserialize
             at src/collections/in_the_pipeline.rs:144:55
  21: autocast::collections::in_the_pipeline::_IMPL_YA_DESERIALIZE_FOR_Feed::<impl yaserde::YaDeserialize for autocast::collections::in_the_pipeline::Feed>::deserialize
             at src/collections/in_the_pipeline.rs:138:55
  22: yaserde::de::from_reader
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/yaserde-0.11.1/src/de/mod.rs:14:3
  23: yaserde::de::from_str
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/yaserde-0.11.1/src/de/mod.rs:10:3
  24: autocast::collections::in_the_pipeline::get_collection::{{closure}}
             at src/collections/in_the_pipeline.rs:39:22
  25: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/future/future.rs:123:9
  26: autocast::main::{{closure}}::{{closure}}::{{closure}}
             at src/main.rs:50:48
  27: <futures_util::stream::stream::for_each::ForEach<St,Fut,F> as core::future::future::Future>::poll
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/futures-util-0.3.30/src/stream/stream/for_each.rs:68:24
  28: autocast::main::{{closure}}
             at src/main.rs:221:10
  29: <core::pin::Pin<P> as core::future::future::Future>::poll
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/future/future.rs:123:9
  30: tokio::runtime::park::CachedParkThread::block_on::{{closure}}
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/park.rs:281:63
  31: tokio::runtime::coop::with_budget
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/coop.rs:107:5
      tokio::runtime::coop::budget
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/coop.rs:73:5
      tokio::runtime::park::CachedParkThread::block_on
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/park.rs:281:31
  32: tokio::runtime::context::blocking::BlockingRegionGuard::block_on
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/context/blocking.rs:66:9
  33: tokio::runtime::scheduler::multi_thread::MultiThread::block_on::{{closure}}
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/mod.rs:87:13
  34: tokio::runtime::context::runtime::enter_runtime
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/context/runtime.rs:65:16
  35: tokio::runtime::scheduler::multi_thread::MultiThread::block_on
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/scheduler/multi_thread/mod.rs:86:9
  36: tokio::runtime::runtime::Runtime::block_on_inner
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/runtime.rs:363:45
  37: tokio::runtime::runtime::Runtime::block_on
             at /Users/drp/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tokio-1.40.0/src/runtime/runtime.rs:333:13
  38: autocast::main
             at src/main.rs:224:5
  39: core::ops::function::FnOnce::call_once
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/ops/function.rs:250:5
  40: std::sys_common::backtrace::__rust_begin_short_backtrace
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys_common/backtrace.rs:155:18
  41: std::rt::lang_start::{{closure}}
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/rt.rs:166:18
  42: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/core/src/ops/function.rs:284:13
      std::panicking::try::do_call
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:552:40
      std::panicking::try
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:516:19
      std::panic::catch_unwind
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panic.rs:146:14
      std::rt::lang_start_internal::{{closure}}
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/rt.rs:148:48
      std::panicking::try::do_call
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:552:40
      std::panicking::try
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panicking.rs:516:19
      std::panic::catch_unwind
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/panic.rs:146:14
      std::rt::lang_start_internal
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/rt.rs:148:20
  43: std::rt::lang_start
             at /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/rt.rs:165:17
  44: _main

The input was a modified version of the RSS feed from https://www.science.org/blogs/pipeline/feed

It's pretty large, so here's a gist: https://gist.githubusercontent.com/djrodgerspryor/62705c7c1c3070fa4c3a1d289c430ba2/raw/98a04923dd7dd15573814cadf50672a8b49d0040/data.xml