Segfault during commit

[fulmicoton]

As reported by @aabstain .

akss:resources akss$ RUST_BACKTRACE=1 cargo run Compiling tantivy_sandbox v0.1.0 (file:///Users/akss/programming/rust/tantivitySandbox) Finished dev [unoptimized + debuginfo] target(s) in 3.70 secs Running/Users/akss/programming/rust/tantivitySandbox/target/debug/tantivy_sandbox 10000 thread 'indexing thread 0 for gen 0' panicked at 'index out of bounds: the len is 3 but the index is 16777216', /Users/travis/build/rust-lang/rust/src/libcollections/vec.rs:1490 stack backtrace: 0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace 1: std::panicking::default_hook::{{closure}} 2: std::panicking::default_hook 3: std::panicking::rust_panic_with_hook 4: std::panicking::begin_panic 5: std::panicking::begin_panic_fmt 6: rust_begin_unwind 7: core::panicking::panic_fmt 8: core::panicking::panic_bounds_check 9: <collections::vec::Vec<T> as core::ops::Index<usize>>::index 10: tantivy::schema::schema::Schema::get_field_entry 11: tantivy::postings::serializer::PostingsSerializer::load_indexing_options 12: tantivy::postings::serializer::PostingsSerializer::new_term 13: <tantivy::postings::postings_writer::SpecializedPostingsWriter<'a, Rec> as tantivy::postings::postings_writer::PostingsWriter>::serialize 14: tantivy::indexer::segment_writer::write 15: tantivy::indexer::segment_writer::SegmentWriter::finalize 16: tantivy::indexer::index_writer::index_documents 17: tantivy::indexer::index_writer::IndexWriter::add_indexing_worker::{{closure}} 18: <std::panic::AssertUnwindSafe<F> as core::ops::FnOnce<()>>::call_once 19: std::panicking::try::do_call 20: __rust_maybe_catch_panic 21: std::panicking::try 22: std::panic::catch_unwind 23: std::thread::Builder::spawn::{{closure}} 24: <F as alloc::boxed::FnBox<A>>::call_box 25: std::sys::imp::thread::Thread::new::thread_start 26: _pthread_body 27: _pthread_start

[fulmicoton]

The bug is in master, not in 0.3.1.

It has been introduced when I changed the way we serialize the field part of the Term.