$ 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