ICE in codemap::CodeMap::bytepos_to_file_charpos

[nwin]

I’m getting an ICE when compiling https://github.com/nwin/gif/tree/cef32bb49589ff55135745b23ac54978ee6edecf using cargo test

$ rustc --version
$ rustc 1.0.0-nightly (abf0548b5 2015-04-15) (built 2015-04-15)

note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'assertion failed: bpos.to_usize() >= mbc.pos.to_usize() + mbc.bytes', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/libsyntax/codemap.rs:780

stack backtrace:
   1:        0x10eb11f2f - sys::backtrace::write::ha929f94fedfba769pSs
   2:        0x10eb1a532 - panicking::on_panic::h99f1d335a08c6040yQw
   3:        0x10ead0765 - rt::unwind::begin_unwind_inner::h9ae94a4551603e31hyw
   4:        0x10e1ee09f - rt::unwind::begin_unwind::h936509937193573473
   5:        0x10e27821a - codemap::CodeMap::bytepos_to_file_charpos::h894b029e4291f71eRlA
   6:        0x10e27628e - codemap::CodeMap::lookup_char_pos::h85ee94f5ab885dffmcA
   7:        0x10b864989 - trans::debuginfo::set_source_location::he11b794ea5b45de1CQw
   8:        0x10b87f154 - trans::expr::trans_unadjusted::hb4afd18239032dc7GuA
   9:        0x10b7b227f - trans::expr::trans::hd8cdbc15463fe10aN7z
  10:        0x10b85356a - trans::expr::trans_to_lvalue::hd50af93dcb00cb6fPtA
  11:        0x10b7c30e8 - trans::base::init_local::h53c6350bcde5d4f8zVg
  12:        0x10b7d3a93 - trans::controlflow::trans_block::h05c053a1e1c911e0pXu
  13:        0x10b88079c - trans::expr::trans_rvalue_dps_unadjusted::h0d3d525097831c6c9ZA
  14:        0x10b8539f7 - trans::expr::trans_into::haf8ca3e6278522acu1z
  15:        0x10b8c07f1 - trans::_match::trans_match_inner::h953f25261ea34903rVH
  16:        0x10b88075c - trans::expr::trans_rvalue_dps_unadjusted::h0d3d525097831c6c9ZA
  17:        0x10b8539f7 - trans::expr::trans_into::haf8ca3e6278522acu1z
  18:        0x10b8534e1 - trans::controlflow::trans_stmt_semi::h6eafcd2a18896ae0tWu
  19:        0x10b7d3a68 - trans::controlflow::trans_block::h05c053a1e1c911e0pXu
  20:        0x10b7d2745 - trans::base::trans_closure::hb95e36728c78f255wCh
  21:        0x10b7d43de - trans::base::trans_fn::hfe46a51c23baaac8eNh
  22:        0x10b816115 - trans::monomorphize::monomorphic_fn::h41b6fefa23d7bff0QvJ
  23:        0x10b8aa0ad - trans::glue::trans_struct_drop::h95c0ab33ac82b921cHE
  24:        0x10b8a988a - trans::glue::trans_struct_drop_flag::h2f9049e44accca59yzE
  25:        0x10b8a779c - trans::glue::get_drop_glue::h5bbbd65896407d4eOrE
  26:        0x10b7d6d53 - trans::glue::drop_ty::ha64a0229575a6c77ioE
  27:        0x10b820c1a - trans::cleanup::DropValue<'tcx>.Cleanup<'tcx>::trans::h11819e958a8977feiXp
  28:        0x10b7d403c - trans::cleanup::FunctionContext<'blk, 'tcx>.CleanupMethods<'blk, 'tcx>::pop_and_trans_custom_cleanup_scope::hc7f42f836e64f431k0o
  29:        0x10b8c0803 - trans::_match::trans_match_inner::h953f25261ea34903rVH
  30:        0x10b88075c - trans::expr::trans_rvalue_dps_unadjusted::h0d3d525097831c6c9ZA
  31:        0x10b8539f7 - trans::expr::trans_into::haf8ca3e6278522acu1z
  32:        0x10b8d6dd1 - trans::_match::mk_binding_alloca::h1219482591938210151
  33:        0x10b7c2ff9 - trans::base::init_local::h53c6350bcde5d4f8zVg
  34:        0x10b7d3a93 - trans::controlflow::trans_block::h05c053a1e1c911e0pXu
  35:        0x10b88079c - trans::expr::trans_rvalue_dps_unadjusted::h0d3d525097831c6c9ZA
  36:        0x10b8539f7 - trans::expr::trans_into::haf8ca3e6278522acu1z
  37:        0x10b8534e1 - trans::controlflow::trans_stmt_semi::h6eafcd2a18896ae0tWu
  38:        0x10b7d3a68 - trans::controlflow::trans_block::h05c053a1e1c911e0pXu
  39:        0x10b7d2745 - trans::base::trans_closure::hb95e36728c78f255wCh
  40:        0x10b7d43de - trans::base::trans_fn::hfe46a51c23baaac8eNh
  41:        0x10b816115 - trans::monomorphize::monomorphic_fn::h41b6fefa23d7bff0QvJ
  42:        0x10b8059b7 - trans::callee::trans_fn_ref_with_substs::h86c8e91680731ba8hzn
  43:        0x10b804452 - trans::callee::trans_fn_ref::h958664b74b95968fmnn
  44:        0x10b81a63b - trans::meth::trans_method_callee::h987afa832ddedd00RsI
  45:        0x10b8189cc - trans::callee::trans_call_inner::h4319642190639167236
  46:        0x10b881399 - trans::expr::trans_rvalue_dps_unadjusted::h0d3d525097831c6c9ZA
  47:        0x10b8539f7 - trans::expr::trans_into::haf8ca3e6278522acu1z
  48:        0x10b7d3da9 - trans::controlflow::trans_block::h05c053a1e1c911e0pXu
  49:        0x10b7d2745 - trans::base::trans_closure::hb95e36728c78f255wCh
  50:        0x10b7d43de - trans::base::trans_fn::hfe46a51c23baaac8eNh
  51:        0x10b816115 - trans::monomorphize::monomorphic_fn::h41b6fefa23d7bff0QvJ
  52:        0x10b8059b7 - trans::callee::trans_fn_ref_with_substs::h86c8e91680731ba8hzn
  53:        0x10b804452 - trans::callee::trans_fn_ref::h958664b74b95968fmnn
  54:        0x10b81a63b - trans::meth::trans_method_callee::h987afa832ddedd00RsI
  55:        0x10b8189cc - trans::callee::trans_call_inner::h4319642190639167236
  56:        0x10b881399 - trans::expr::trans_rvalue_dps_unadjusted::h0d3d525097831c6c9ZA
  57:        0x10b87f644 - trans::expr::trans_unadjusted::hb4afd18239032dc7GuA
  58:        0x10b7b227f - trans::expr::trans::hd8cdbc15463fe10aN7z
  59:        0x10b85356a - trans::expr::trans_to_lvalue::hd50af93dcb00cb6fPtA
  60:        0x10b7c30e8 - trans::base::init_local::h53c6350bcde5d4f8zVg
  61:        0x10b7d3a93 - trans::controlflow::trans_block::h05c053a1e1c911e0pXu
  62:        0x10b88079c - trans::expr::trans_rvalue_dps_unadjusted::h0d3d525097831c6c9ZA
  63:        0x10b8539f7 - trans::expr::trans_into::haf8ca3e6278522acu1z
  64:        0x10b7d3da9 - trans::controlflow::trans_block::h05c053a1e1c911e0pXu
  65:        0x10b7d2745 - trans::base::trans_closure::hb95e36728c78f255wCh
  66:        0x10b7d43de - trans::base::trans_fn::hfe46a51c23baaac8eNh
  67:        0x10b7d7948 - trans::base::trans_item::h5ed811cd725f9768qbi
  68:        0x10b7e6730 - trans::base::trans_crate::ha94fa9dd82b4aff2r0i
  69:        0x10b272e0e - driver::phase_4_translate_to_llvm::h1f657f4f3b9a6259hOa
  70:        0x10b24b2f4 - driver::compile_input::h00eb3ba6a5bfe392Qba
  71:        0x10b3128f3 - run_compiler::h4caa8708186861beF4b
  72:        0x10b31041a - boxed::F.FnBox<A>::call_box::h5773103399936443887
  73:        0x10b30f8b7 - rt::unwind::try::try_fn::h10299548411236091824
  74:        0x10eba32f8 - rust_try_inner
  75:        0x10eba32e5 - rust_try
  76:        0x10b30fb90 - boxed::F.FnBox<A>::call_box::h3149649929762739958
  77:        0x10eb1907d - sys::thread::create::thread_start::h2951ccda778a4dacgVv
  78:     0x7fff9b248267 - _pthread_body
  79:     0x7fff9b2481e4 - _pthread_start

[nwin]

I was able to trace down the bug. It is due to me using a unicode character in the documentation of a function this somehow triggers the compiler bug. A minimal example is:

src/main.rs

extern crate lzw;

fn main() {
    let mut v = vec![];
    let _ = lzw::Encoder::new(lzw::LsbWriter::new(&mut v), 8);
}

Cargo.toml

[package]
name = "rustbug"
version = "0.1.0"

[dependencies]
lzw = "0.4.0"

[larsbergstrom]

@brson @SimonSapin I believe Servo is also currently hitting this in the script crate during our current rust upgrade.

[SimonSapin]

Yes, at least the failing assertion is the same. Removing non-ASCII characters from doc comments didn’t seem to help, though.

[Manishearth]

cc @pnkfelix

might this be another overflow error?

[SimonSapin]

@Aatch recommended on IRC to build with RUST_LOG=syntax::codemap, but log output seems to be disabled in Nightly. So I built Rust with debugging enabled and tried again. (This took forever because of #24840.) There was a lot of output, here is just the end of it:

DEBUG:syntax::codemap: byte pos BytePos(16658606) is on the line at byte pos BytePos(16658559)
DEBUG:syntax::codemap: char pos CharPos(51454) is on the line at char pos CharPos(51407)
DEBUG:syntax::codemap: byte is on line: 1251
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: byte pos BytePos(16658606) is on the line at byte pos BytePos(16658559)
DEBUG:syntax::codemap: char pos CharPos(51454) is on the line at char pos CharPos(51407)
DEBUG:syntax::codemap: byte is on line: 1251
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: byte pos BytePos(16658574) is on the line at byte pos BytePos(16658559)
DEBUG:syntax::codemap: char pos CharPos(51422) is on the line at char pos CharPos(51407)
DEBUG:syntax::codemap: byte is on line: 1251
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: byte pos BytePos(16658574) is on the line at byte pos BytePos(16658559)
DEBUG:syntax::codemap: char pos CharPos(51422) is on the line at char pos CharPos(51407)
DEBUG:syntax::codemap: byte is on line: 1251
DEBUG:syntax::codemap: byte pos BytePos(13039630) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(654) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: byte pos BytePos(13039630) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(654) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: byte pos BytePos(16658606) is on the line at byte pos BytePos(16658559)
DEBUG:syntax::codemap: char pos CharPos(51454) is on the line at char pos CharPos(51407)
DEBUG:syntax::codemap: byte is on line: 1251
DEBUG:syntax::codemap: byte pos BytePos(13039630) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(654) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: byte pos BytePos(16658574) is on the line at byte pos BytePos(16658559)
DEBUG:syntax::codemap: char pos CharPos(51422) is on the line at char pos CharPos(51407)
DEBUG:syntax::codemap: byte is on line: 1251
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
DEBUG:syntax::codemap: byte pos BytePos(16658574) is on the line at byte pos BytePos(16658559)
DEBUG:syntax::codemap: char pos CharPos(51422) is on the line at char pos CharPos(51407)
DEBUG:syntax::codemap: byte is on line: 1251
DEBUG:syntax::codemap: byte pos BytePos(13039630) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(654) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: byte pos BytePos(13039630) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(654) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: byte pos BytePos(13039630) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(654) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: byte pos BytePos(13039587) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(611) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: byte pos BytePos(13039587) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(611) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: byte pos BytePos(13039587) is on the line at byte pos BytePos(13039587)
DEBUG:syntax::codemap: char pos CharPos(611) is on the line at char pos CharPos(611)
DEBUG:syntax::codemap: byte is on line: 11
DEBUG:syntax::codemap: byte pos BytePos(13039585) is on the line at byte pos BytePos(13039556)
DEBUG:syntax::codemap: char pos CharPos(609) is on the line at char pos CharPos(580)
DEBUG:syntax::codemap: byte is on line: 10
DEBUG:syntax::codemap: byte pos BytePos(13039585) is on the line at byte pos BytePos(13039556)
DEBUG:syntax::codemap: char pos CharPos(609) is on the line at char pos CharPos(580)
DEBUG:syntax::codemap: byte is on line: 10
DEBUG:syntax::codemap: byte pos BytePos(13039216) is on the line at byte pos BytePos(13039187)
DEBUG:syntax::codemap: char pos CharPos(240) is on the line at char pos CharPos(211)
DEBUG:syntax::codemap: byte is on line: 5
DEBUG:syntax::codemap: byte pos BytePos(13039046) is on the line at byte pos BytePos(13039046)
DEBUG:syntax::codemap: char pos CharPos(70) is on the line at char pos CharPos(70)
DEBUG:syntax::codemap: byte is on line: 2
DEBUG:syntax::codemap: 2-byte char at BytePos(16638556)
DEBUG:syntax::codemap: 2-byte char at BytePos(16639495)
DEBUG:syntax::codemap: 2-byte char at BytePos(16647639)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654088)
DEBUG:syntax::codemap: 2-byte char at BytePos(16654573)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655087)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655535)
DEBUG:syntax::codemap: 2-byte char at BytePos(16655993)
DEBUG:syntax::codemap: 2-byte char at BytePos(16656585)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657212)
DEBUG:syntax::codemap: 2-byte char at BytePos(16657579)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658114)
DEBUG:syntax::codemap: 2-byte char at BytePos(16658626)
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'assertion failed: bpos.to_usize() >= mbc.pos.to_usize() + mbc.bytes', /home/simon/projects/rust/src/libsyntax/codemap.rs:777

stack backtrace:
   1:     0x7f71ce0dced0 - sys::backtrace::write::h08980a46da6e74e2BYr
   2:     0x7f71ce107b90 - panicking::on_panic::hb2484b9e4c558cd8pow
   3:     0x7f71ce03f19a - rt::unwind::begin_unwind_inner::hfc82ed5074bb350fz3v
   4:     0x7f71c99d23d5 - rt::unwind::begin_unwind::h2534745300781190008
   5:     0x7f71c9b37757 - codemap::CodeMap::bytepos_to_file_charpos::h6d1c81abe106f045uoA
   6:     0x7f71c9b31f46 - codemap::CodeMap::lookup_pos::h27d65e66f05d4f4a6wA
   7:     0x7f71c9b31bc6 - codemap::CodeMap::lookup_char_pos::h02661bc11144a6711eA
   8:     0x7f71cc6f4c26 - trans::debuginfo::span_start::h9bf55337ae693b740Ey
   9:     0x7f71cc6fddd6 - trans::debuginfo::set_source_location::hbf96c03b4e6ff4fbyUw
  10:     0x7f71cc6d1164 - trans::expr::trans_into::h5a3dbd1afd743e21Z3z
  11:     0x7f71cc508d12 - trans::controlflow::trans_block::h6871c127495454c2n1u
  12:     0x7f71cc505604 - trans::base::trans_closure::hea4a26a7f91465e2WDh
  13:     0x7f71cc5097b1 - trans::base::trans_fn::hbb78e9676a50cfaeEOh
  14:     0x7f71cc6034fa - trans::monomorphize::monomorphic_fn::h80a7be131545d682YzJ
  15:     0x7f71cc5e4655 - trans::callee::trans_fn_ref_with_substs::hb1478d6051ffa327hGn
  16:     0x7f71cc5e0d1c - trans::callee::trans_fn_ref::h93734b12782ed2ffmun
  17:     0x7f71cc60c65f - trans::meth::trans_method_callee::h5fff77d6ceae5c3dZwI
  18:     0x7f71cc60b569 - trans::callee::trans_method_call::closure.46850
  19:     0x7f71cc60940b - trans::callee::trans_call_inner::h17766741276310928787
  20:     0x7f71cc6090e4 - trans::callee::trans_method_call::hed20f80cc0b413f7cWn
  21:     0x7f71cc7527e8 - trans::expr::trans_rvalue_dps_unadjusted::h83be1216c408f410E2A
  22:     0x7f71cc74fdbe - trans::expr::trans_unadjusted::haf468703d9fe6a89bxA
  23:     0x7f71cc4a10ce - trans::expr::trans::had454b703659cbaaiaA
  24:     0x7f71cc6d391d - trans::controlflow::trans_while::hd34ba84a34a1f8e40bv
  25:     0x7f71cc75408a - trans::expr::trans_rvalue_stmt_unadjusted::hb225337bc26f736aTWA
  26:     0x7f71cc6d1f5c - trans::expr::trans_into::h5a3dbd1afd743e21Z3z
  27:     0x7f71cc6d0cab - trans::controlflow::trans_stmt_semi::hce795bf5cb8c3dacr0u
  28:     0x7f71cc6d0901 - trans::controlflow::trans_stmt::he906ac264fddc322IWu
  29:     0x7f71cc50895f - trans::controlflow::trans_block::h6871c127495454c2n1u
  30:     0x7f71cc505604 - trans::base::trans_closure::hea4a26a7f91465e2WDh
  31:     0x7f71cc5097b1 - trans::base::trans_fn::hbb78e9676a50cfaeEOh
  32:     0x7f71cc6034fa - trans::monomorphize::monomorphic_fn::h80a7be131545d682YzJ
  33:     0x7f71cc5e4655 - trans::callee::trans_fn_ref_with_substs::hb1478d6051ffa327hGn
  34:     0x7f71cc5e0d1c - trans::callee::trans_fn_ref::h93734b12782ed2ffmun
  35:     0x7f71cc60c65f - trans::meth::trans_method_callee::h5fff77d6ceae5c3dZwI
  36:     0x7f71cc60b569 - trans::callee::trans_method_call::closure.46850
  37:     0x7f71cc60940b - trans::callee::trans_call_inner::h17766741276310928787
  38:     0x7f71cc6090e4 - trans::callee::trans_method_call::hed20f80cc0b413f7cWn
  39:     0x7f71cc7527e8 - trans::expr::trans_rvalue_dps_unadjusted::h83be1216c408f410E2A
  40:     0x7f71cc6d1f1d - trans::expr::trans_into::h5a3dbd1afd743e21Z3z
  41:     0x7f71cc6d0cab - trans::controlflow::trans_stmt_semi::hce795bf5cb8c3dacr0u
  42:     0x7f71cc6d0901 - trans::controlflow::trans_stmt::he906ac264fddc322IWu
  43:     0x7f71cc50895f - trans::controlflow::trans_block::h6871c127495454c2n1u
  44:     0x7f71cc505604 - trans::base::trans_closure::hea4a26a7f91465e2WDh
  45:     0x7f71cc5097b1 - trans::base::trans_fn::hbb78e9676a50cfaeEOh
  46:     0x7f71cc524095 - trans::meth::trans_impl::h87001477d5bcaf621rI
  47:     0x7f71cc517bfe - trans::base::trans_item::h9f1576297a068a24Qci
  48:     0x7f71cc524385 - trans::base::trans_mod::h417fe1d01d08c6aarji
  49:     0x7f71cc517c1a - trans::base::trans_item::h9f1576297a068a24Qci
  50:     0x7f71cc524385 - trans::base::trans_mod::h417fe1d01d08c6aarji
  51:     0x7f71cc517c1a - trans::base::trans_item::h9f1576297a068a24Qci
  52:     0x7f71cc524385 - trans::base::trans_mod::h417fe1d01d08c6aarji
  53:     0x7f71cc541fe6 - trans::base::trans_crate::hbfdd1c436c9d28cfQ1i
  54:     0x7f71ce948bb6 - driver::phase_4_translate_to_llvm::closure.21711
  55:     0x7f71ce948495 - util::common::time::h2155069861539402289
  56:     0x7f71ce79f8f8 - driver::phase_4_translate_to_llvm::h88ba570da300781anOa
  57:     0x7f71ce727095 - driver::compile_input::h1510f854f2d36ee2Qba
  58:     0x7f71ce9c0a6c - run_compiler::h95c097e7c3641e22F4b
  59:     0x7f71ce9bd18f - run::closure.24225
  60:     0x7f71ce9bc315 - monitor::closure.24198
  61:     0x7f71ce9bc1d1 - boxed::F.FnBox<A>::call_box::h12119986062606539287
  62:     0x7f71ce9bbd89 - boxed::Box<FnBox<A, Output $u3d$$u20$R$GT$$u2b$$u20$Send$u20$$u2b$$u20$$u27$a$GT$.FnOnce$LT$A$GT$::call_once::h5437889980002254030
  63:     0x7f71ce9bb47f - thread::Builder::spawn_inner::closure.24176
  64:     0x7f71ce9bb410 - rt::unwind::try::try_fn::__rust_abi::h16853098609345213920
  65:     0x7f71ce9bb3a2 - rt::unwind::try::try_fn::h16853098609345213920
  66:     0x7f71ce23db38 - rust_try_inner
  67:     0x7f71ce23db25 - rust_try
  68:     0x7f71ce9ba87d - rt::unwind::try::h2566811498102976929
  69:     0x7f71ce9ba63f - thread::Builder::spawn_inner::closure.24111
  70:     0x7f71ce9bc00e - boxed::F.FnBox<A>::call_box::h5616702962572060708
  71:     0x7f71ce0d41c9 - boxed::Box<FnBox<A, Output $u3d$$u20$R$GT$$u2b$$u20$$u27$a$GT$.FnOnce$LT$A$GT$::call_once::h9226137156718365614
  72:     0x7f71ce0d40c1 - sys_common::thread::start_thread::hbce903f8d63cd24fm0q
  73:     0x7f71ce10354d - sys::thread::Thread::new::thread_start::__rust_abi
  74:     0x7f71ce10353d - sys::thread::Thread::new::thread_start::h9f22503d649858f609u
  75:     0x7f71c67be373 - start_thread
  76:     0x7f71cdcb227c - clone
  77:                0x0 - <unknown>

Could not compile `script`.

To learn more, run the command again with --verbose.
Build completed in 3326.77s

Total: 55:27.80)       User: 52:50.22)       Kernel: 1:31.78)       System: 98%)

[SimonSapin]

This is 4013523 lines / 299MB of output.

[pnkfelix]

my current hypothesis is that this addition in creader.rs is the problem; it is at the very least very suspicious considering that five lines up in the previous statement we are normalizing the position to zero by subtracting the start_pos, not adding it.

[pnkfelix]

(other good news: I have figured out how to make a regression test for this that will integrate into the rust test suite.)