failed to find block with tag 7

[rrichardson]

I am assuming this has something to do with me trying to impl for a trait with associated types, because that's what I was changing. I'll try to make a repro case, but in the mean time:

ERROR:rbml::reader: failed to find block with tag 7
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librbml/lib.rs:253

stack backtrace:
   1:     0x7f55828182d0 - sys::backtrace::write::h8532e701ef86014f4it
   2:     0x7f558283db00 - failure::on_fail::h7532e1f79d134d5dzvz
   3:     0x7f55827a31c0 - rt::unwind::begin_unwind_inner::h97b151606151d62deaz
   4:     0x7f557c316ac0 - rt::unwind::begin_unwind::h1843747829001292891
   5:     0x7f557c3155c0 - reader::get_doc::h63836efa91f81d00VKa
   6:     0x7f5580c08f40 - metadata::decoder::get_type::h1cb96cb089b860dbZmj
   7:     0x7f5580bbd8c0 - metadata::csearch::get_type::h7b53968868e941ac4am
   8:     0x7f5581f2c250 - collect::CrateCtxt<'a, 'tcx>.AstConv<'tcx>::get_item_type_scheme::ha0eb6bc4857d45c3m9s
   9:     0x7f5581f46400 - astconv::ast_path_to_ty::h3768578112657990385
  10:     0x7f5581f43200 - astconv::ast_ty_to_ty::unboxed_closure.36533
  11:     0x7f5581feb6b0 - astconv::ast_ty_to_ty::h1817371328037270331
  12:     0x7f5581fe3010 - collect::ty_generics::h3764166756383902774
  13:     0x7f5581f2edd0 - collect::convert::ha082397a8ef1fe06tAt
  14:     0x7f5581f2ab90 - visit::Visitor::visit_mod::h3305858018731920637
  15:     0x7f5581f3c1c0 - visit::walk_item::h8703911783927424805
  16:     0x7f5582030dd0 - check_crate::unboxed_closure.40065
  17:     0x7f558202ec30 - check_crate::h19fb6dea5733566ajsx
  18:     0x7f5582d69640 - driver::phase_3_run_analysis_passes::h46b1604d9f9f5633Tva
  19:     0x7f5582d57ae0 - driver::compile_input::h68b8602933aad8d7wba
  20:     0x7f5582e22eb0 - thunk::F.Invoke<A, R>::invoke::h18029802347644288836
  21:     0x7f5582e21c60 - rt::unwind::try::try_fn::h6518866316425934196
  22:     0x7f55828a4400 - rust_try_inner
  23:     0x7f55828a43f0 - rust_try
  24:     0x7f5582e21fb0 - thunk::F.Invoke<A, R>::invoke::h15513809553472565307
  25:     0x7f5582829e40 - sys::thread::thread_start::h5ea7ba97235331d5a9v
  26:     0x7f557ce780c0 - start_thread
  27:     0x7f5582449ec9 - __clone
  28:                0x0 - <unknown>

Could not compile `net_stream`.

[jonas-schievink]

I'm getting something similar:

/home/jonas/rust/linalg/src/vector.rs:7:13: 7:19 error: default type parameters are experimental and possibly buggy [E0108]
/home/jonas/rust/linalg/src/vector.rs:7 impl <U, T: Add<U>> Add for Vector2<T> {
                                                    ^~~~~~
/home/jonas/rust/linalg/src/vector.rs:7:13: 7:19 help: add #![feature(default_type_params)] to the crate attributes to enable
/home/jonas/rust/linalg/src/vector.rs:7 impl <U, T: Add<U>> Add for Vector2<T> {
                                                    ^~~~~~
ERROR:rbml::reader: failed to find block with tag 7
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
fish: Job 1, “env RUST_BACKTRACE=1 rustc /home/jonas/rust/linalg/src/lib.rs --crate-name linalg --crate-type lib -g -C metadata=467966ee376b8dd3 -C extra-filename=-467966ee376b8dd3 --out-dir /home/jonas/rust/linalg/target --emit=dep-info,link -L /home/jonas/rust/linalg/target -L /home/jonas/rust/linalg/target/deps” terminated by signal SIGILL (Illegal instruction)

When compiling:

use std::ops::{Add};

pub struct Vector2<T> {
    pub elems: [T; 2],
}

impl <U, T: Add<U>> Add for Vector2<T> {
    pub fn add(self, rhs: &Vector2<U>) -> Vector2<Add<U>::Output> {
    }
}

I didn't intend to specify a default type for T, but wanted a trait constraint on Add<U>. Just writing Add fixes the warning, the rest stays the same. Also note how rustc crashes with SIGILL before printing how rustc panicked (I can't get a backtrace this way, and it happens independent of the value of RUST_BACKTRACE).

[bfops]

I'm getting the same error. I Ctrl-Cd a build, and now this happens.

ERROR:rbml::reader: failed to find block with tag 7
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librbml/lib.rs:260

stack backtrace:
  1:     0x7f5f9c440410 - sys::backtrace::write::hb159f9850e834894l1s
  2:     0x7f5f9c465150 - failure::on_fail::hd4fb51e7b66e269fxgz
  3:     0x7f5f9c3caf20 - rt::unwind::begin_unwind_inner::he95e3015bc1198c6tVy
  4:     0x7f5f95e067c0 - rt::unwind::begin_unwind::h13575525727365681082
  5:     0x7f5f95e052c0 - reader::get_doc::hd7ae0dfafb4be73c4Ka
  6:     0x7f5f9a9425b0 - metadata::decoder::item_type::hb8f98ef796e04d7cPUi
  7:     0x7f5f9a953030 - metadata::decoder::get_type::h2d8643563367a1c1A6i
  8:     0x7f5f9a784800 - middle::ty::lookup_item_type::h3242b1ceb33ff7f6sv8
  9:     0x7f5f9bcb4e50 - coherence::CoherenceChecker<'a, 'tcx>::check::hbe21b009cdc1d00crfv
  10:     0x7f5f9bccd5c0 - check_crate::unboxed_closure.40370
  11:     0x7f5f9bcc9720 - check_crate::h3f64d3a4a846d0b2Nrx
  12:     0x7f5f9c980cd0 - driver::phase_3_run_analysis_passes::had0a81b4c9f8a9cd6va
  13:     0x7f5f9c96eb50 - driver::compile_input::h4f21f66f6761bb22vba
  14:     0x7f5f9ca37640 - thunk::F.Invoke<A, R>::invoke::h1208443586143045988
  15:     0x7f5f9ca363f0 - rt::unwind::try::try_fn::h4735177180287591181
  16:     0x7f5f9c4c9810 - rust_try_inner
  17:     0x7f5f9c4c9800 - rust_try
  18:     0x7f5f9ca36740 - thunk::F.Invoke<A, R>::invoke::h6623100047367797814
  19:     0x7f5f9c4513d0 - sys::thread::thread_start::h89f54a8cba556c09RSv
  20:     0x7f5f96966250 - start_thread
  21:     0x7f5f9c083219 - clone
  22:                0x0 - <unknown>

Could not compile `playform`.

[Stebalien]

Same here. This works:

pub struct EmptyIterator;
impl Iterator for EmptyIterator {
    type Item = ();
    fn next(&mut self) -> Option<<EmptyIterator as Iterator>::Item> {
        None
    }
}

This doesn't:

struct EmptyIterator;
impl Iterator for EmptyIterator {
    type Item = ();
    fn next(&mut self) -> Option<Iterator::Item> {
        None
    }
}

[blevin]

Hit this panic in today's nightly: rustc 1.0.0-nightly (44a287e6e 2015-01-08 17:03:40 -0800)

use std::ops::Mul;
pub fn sqr<T>(x:T) -> Mul<T>::Output where T: Copy+Mul {
    x*x
}

[zsparal]

I hit the same panic in the current nightly: rustc 1.0.0-nightly (170c4399e 2015-01-14 00:41:55 +0000)

trait Vec3d {
    fn cross<V>(&self, rhs: &V)  
        where V: Vec3d,
              Mul<<Self as Index<usize>>::Output>::Output: Float { } 
}

And the backtrace:

stack backtrace:
   1:     0x7fe03b886ed0 - sys::backtrace::write::hf251c2373d8c39658Rt
   2:     0x7fe03b8a88b0 - failure::on_fail::h2ff2bf5f19ce9580S5z
   3:     0x7fe03b8177b0 - rt::unwind::begin_unwind_inner::h639cf27e708a803eKKz
   4:     0x7fe0352e1490 - rt::unwind::begin_unwind::h17544861623042600436
   5:     0x7fe0352e0230 - reader::get_doc::hc8977291e5d4282fZKa
   6:     0x7fe039de2710 - metadata::decoder::item_type::h9de63b0b6048c689Xpj
   7:     0x7fe039df3120 - metadata::decoder::get_type::h0e444e6b974068c1KBj
   8:     0x7fe039da4dc0 - metadata::csearch::get_type::h860647b7be886ccd2sm
   9:     0x7fe03b0cddc0 - collect::CollectCtxt<'a, 'tcx>.AstConv<'tcx>::get_item_type_scheme::hc2534e432eeb53efcNt
  10:     0x7fe03b0b90a0 - astconv::ast_path_to_ty::h7dc2fdd21d7bc5aafss
  11:     0x7fe03b0bab40 - astconv::ast_ty_to_ty::unboxed_closure.29407
  12:     0x7fe03b06d0e0 - astconv::ast_ty_to_ty::hc931bbae55b3495bzSs
  13:     0x7fe03b0e6f30 - collect::ty_generics::hdeb07cf2e292b5fa3Vu
  14:     0x7fe03b0e2640 - collect::ty_generics_for_fn_or_method::h61776e35acfd2992GSu
  15:     0x7fe03b0e28d0 - collect::convert_methods::ty_of_method::hfb2b2df960a5e773hbu
  16:     0x7fe03b0d1e90 - collect::convert::h263630c2880766eboeu
  17:     0x7fe03b116680 - check_crate::unboxed_closure.30640
  18:     0x7fe03b1146c0 - check_crate::h6601a13b429d0a57ney
  19:     0x7fe03bdd8ff0 - driver::phase_3_run_analysis_passes::h039ad5f8102225f2EEa
  20:     0x7fe03bdc6dd0 - driver::compile_input::haa1e0a1302dab243Aba
  21:     0x7fe03be886c0 - run_compiler::h385e1ee7d7e284bee5b
  22:     0x7fe03be86e30 - thunk::F.Invoke<A, R>::invoke::h17064898529926817575
  23:     0x7fe03be85d90 - rt::unwind::try::try_fn::h13784017587596973898
  24:     0x7fe03b90fa60 - rust_try_inner
  25:     0x7fe03b90fa50 - rust_try
  26:     0x7fe03be86040 - thunk::F.Invoke<A, R>::invoke::h10896099676476614463
  27:     0x7fe03b896550 - sys::thread::thread_start::h9cd6def278b6034eVJw
  28:     0x7fe035e40250 - start_thread
  29:     0x7fe03b4c8219 - clone
  30:                0x0 - <unknown>

[dcuddeback]

I just got this error too. I was running cargo build at the time of the bug. I pushed up my code in its exact state when the bug occured: https://github.com/dcuddeback/rust-bug/tree/3c11b1a5cddb7cdfc9021e75814a833bd455e902

My most recent change before triggering the bug is that I changed the Error type in the Encodable implementation here: https://github.com/dcuddeback/rust-bug/blob/3c11b1a5cddb7cdfc9021e75814a833bd455e902/src/command.rs#L21 I was previously getting an error message that it expected Error to be an associated type, so I changed it from std::error::Error to Encoder::Error. Come to think of it, that should be S::Error.

$ cargo build
   Compiling zwave v0.0.1 (file:///Users/david/src/zwave)
ERROR:rbml::reader: failed to find block with tag 7u
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/librbml/lib.rs:253


Could not compile `zwave`.

To learn more, run the command again with --verbose.
Davids-Mac-Pro:zwave (master) $ RUST_BACKTRACE=1 cargo build
   Compiling zwave v0.0.1 (file:///Users/david/src/zwave)
ERROR:rbml::reader: failed to find block with tag 7u
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/librbml/lib.rs:253

stack backtrace:
   1:        0x11070fb1c - sys::backtrace::write::hf2ebbbc2b1e17d4dPVt
   2:        0x1107317cf - failure::on_fail::h8104d9bfedbdb4c2DZz
   3:        0x11069e1ee - rt::unwind::begin_unwind_inner::ha4d120f202d1295cuHz
   4:        0x10ea5310b - rt::unwind::begin_unwind::h6598034689533309194
   5:        0x10ea51fd9 - reader::get_doc::hfb8e8c99c37c187bYKa
   6:        0x10dabf938 - metadata::decoder::item_type::h3cba7f172d334da0Szj
   7:        0x10dacfddb - metadata::decoder::get_type::h2f6cd61dd7e7d2bb6Lj
   8:        0x10da81f2e - metadata::csearch::get_type::he6c7fdb2dc9b48a0MFm
   9:        0x10d459524 - collect::CollectCtxt<'a, 'tcx>.AstConv<'tcx>::get_item_type_scheme::h527c4019d48bb49353t
  10:        0x10d4450f1 - astconv::ast_path_to_ty::haa3570fa44fb6cf98Is
  11:        0x10d448de7 - astconv::ast_ty_to_ty::unboxed_closure.29986
  12:        0x10d3e5c68 - astconv::ast_ty_to_ty::h2e2f224b22cd5dfdJ9s
  13:        0x10d43f0e9 - vec::Vec<T>.FromIterator<T>::from_iter::h14928839551931381196
  14:        0x10d43d3e6 - astconv::convert_angle_bracketed_parameters::hf0682d835e3d0455Bks
  15:        0x10d3e53c8 - astconv::ast_path_substs_for_ty::he91005be89c29bfecas
  16:        0x10d4451ec - astconv::ast_path_to_ty::haa3570fa44fb6cf98Is
  17:        0x10d448de7 - astconv::ast_ty_to_ty::unboxed_closure.29986
  18:        0x10d3e5c68 - astconv::ast_ty_to_ty::h2e2f224b22cd5dfdJ9s
  19:        0x10d43fc3f - astconv::convert_ty_with_lifetime_elision::h24b5c2f0bfa28d0dMos
  20:        0x10d44a8ca - astconv::ty_of_method_or_bare_fn::heeb753278e884d9f0rt
  21:        0x10d449c61 - astconv::ty_of_method::hb5bd6cb93ae1d0ffmqt
  22:        0x10d46d299 - collect::convert_methods::ty_of_method::h7671aa56beff0427asu
  23:        0x10d45fdac - collect::convert::h38fdd2028e060c53hvu
  24:        0x10d457dc2 - visit::walk_mod::h54061686586147098
  25:        0x10d49488e - check_crate::unboxed_closure.31098
  26:        0x10d492951 - check_crate::h05b28be74dfcf5bcayy
  27:        0x10cdfbfce - driver::phase_3_run_analysis_passes::hebe0d39037654bf9aGa
  28:        0x10cde7bde - driver::compile_input::h34c1c11c6899857fAba
  29:        0x10cea5716 - run_compiler::h823f7b3bd358b28alac
  30:        0x10cea2a73 - thunk::F.Invoke<A, R>::invoke::h2577805882533131152
  31:        0x10cea18d8 - rt::unwind::try::try_fn::h7233092926527859983
  32:        0x11079b2a9 - rust_try_inner
  33:        0x11079b296 - rust_try
  34:        0x10cea1f16 - thunk::F.Invoke<A, R>::invoke::h8652838825404240908
  35:        0x11071ee92 - sys::thread::thread_start::h239f7d5cb0adebaaGKw
  36:     0x7fff8cbb32fc - _pthread_body
  37:     0x7fff8cbb3279 - _pthread_body

Could not compile `zwave`.

To learn more, run the command again with --verbose.

Rust version:

rustc 1.0.0-nightly (ed530d7a3 2015-01-16 22:41:16 +0000)
binary: rustc
commit-hash: ed530d7a3b67989047e6fe61fe101b9d8158585f
commit-date: 2015-01-16 22:41:16 +0000
host: x86_64-apple-darwin
release: 1.0.0-nightly

Cargo version:

cargo 0.0.1-pre-nightly (8154255 2015-01-14 19:14:12 +0000)

[osamu0329nakamura]

following code panicked with ERROR:rbml::reader: failed to find block with tag 7u

fn f(a : Iterator) where Iterator::Item : std::fmt::String
{
}

fn main()
{
}

ERROR:rbml::reader: failed to find block with tag 7u
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /build/rust/src/rustc-1.0.0-alpha/src/librbml/lib.rs:253

stack backtrace:
   1:     0x7fe6bf424e60 - sys::backtrace::write::h78d6cca6cec5e106Czt
   2:     0x7fe6bf446aa0 - <unknown>
   3:     0x7fe6bf3b6cf0 - rt::unwind::begin_unwind_inner::hbe118f1b5f67c2242tz
   4:     0x7fe6b91bdf90 - <unknown>
   5:     0x7fe6b91bcef0 - reader::get_doc::h8a8c9232b9c7ad1bZKa
   6:     0x7fe6bda52c30 - metadata::decoder::get_type::h1caecc7ac49c6828msj
   7:     0x7fe6bda04b90 - metadata::csearch::get_type::hde6d946068b8b918Ijm
   8:     0x7fe6bec82dc0 - collect::CollectCtxt<'a, 'tcx>.AstConv<'tcx>::get_item_type_scheme::hd156e70f6ebc4e40RCt
   9:     0x7fe6bec6de70 - <unknown>
  10:     0x7fe6bec6f790 - <unknown>
  11:     0x7fe6bec25480 - astconv::ast_ty_to_ty::ha17967805811915beIs
  12:     0x7fe6bec99d20 - <unknown>
  13:     0x7fe6bec95960 - <unknown>
  14:     0x7fe6bec8cce0 - <unknown>
  15:     0x7fe6bec86cf0 - <unknown>
  16:     0x7fe6becc76c0 - <unknown>
  17:     0x7fe6becc5570 - check_crate::h6ee7b1d7b661b45c23x
  18:     0x7fe6bf968480 - driver::phase_3_run_analysis_passes::h00df603eef1b723bgwa
  19:     0x7fe6bf9515d0 - driver::compile_input::hc42a62ce2a43792axba
  20:     0x7fe6bfa1f4a0 - <unknown>
  21:     0x7fe6bfa1f370 - <unknown>
  22:     0x7fe6bfa1e0f0 - <unknown>
  23:     0x7fe6bf4a30f0 - <unknown>
  24:     0x7fe6bf4a30e0 - rust_try
  25:     0x7fe6bfa1e3e0 - <unknown>
  26:     0x7fe6bf434e30 - <unknown>
  27:     0x7fe6b9d1d250 - start_thread
  28:     0x7fe6bf06c219 - clone
  29:                0x0 - <unknown>

Environment: Arch Linux

$ rustc --version
rustc 1.0.0-dev

[Lysxia]

I get the same error with this one-line file:

type T = Iterator::Item;

Debian user.

rustc 1.0.0-nightly (4e4e8cff1 2015-01-24 22:14:14 +0000)
binary: rustc
commit-hash: 4e4e8cff1697ec79bcd0a1e45e63fb2f54a7ea28
commit-date: 2015-01-24 22:14:14 +0000
host: x86_64-unknown-linux-gnu
release: 1.0.0-nightly

---

$ echo "type T = Iterator::Item;" > panic.rs
$ RUST_BACKTRACE=1 rustc --crate-type=lib panic.rs
ERROR:rbml::reader: failed to find block with tag 7
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librbml/lib.rs:262

stack backtrace:
   1:     0x7f9ce7fb75e0 - sys::backtrace::write::h4d3bbe08a44dee4aRbu
   2:     0x7f9ce7fdace0 - failure::on_fail::h53efd1909aa8a1f2jmB
   3:     0x7f9ce7f47050 - rt::unwind::begin_unwind_inner::h0e24af2cd7543451k1A
   4:     0x7f9ce12bb430 - rt::unwind::begin_unwind::h2286129482268768168
   5:     0x7f9ce12ba1c0 - reader::get_doc::h6fcf164d61a0eed4nLa
   6:     0x7f9ce62aba20 - metadata::decoder::item_type::h124d99db0047034alTg
   7:     0x7f9ce62bc430 - metadata::decoder::get_type::h03c0f48119e223b8u5g
   8:     0x7f9ce626c150 - metadata::csearch::get_type::hcd92c9a503a2a41ckWj
   9:     0x7f9ce77da340 - collect::CollectCtxt<'a, 'tcx>.AstConv<'tcx>::get_item_type_scheme::h4e70e9be93fc772fIgu
  10:     0x7f9ce77c9230 - astconv::ast_path_to_ty::heb9bbc4a061d898eKSs
  11:     0x7f9ce77ca700 - astconv::ast_ty_to_ty::unboxed_closure.30768
  12:     0x7f9ce7765290 - astconv::ast_ty_to_ty::h84248d43c3bae556ujt
  13:     0x7f9ce77e86a0 - collect::ty_of_item::hd540332b324b20cfn6u
  14:     0x7f9ce77dfc40 - collect::convert::hbe3857c09eac11a1fIu
  15:     0x7f9ce78197d0 - check_crate::unboxed_closure.31906
  16:     0x7f9ce7817710 - check_crate::hc9b4c474446351a3YMy
  17:     0x7f9ce853b080 - driver::phase_3_run_analysis_passes::he5f3b198079d8d2eVFa
  18:     0x7f9ce85230b0 - driver::compile_input::ha4b908a84d39061dBba
  19:     0x7f9ce85e6d70 - run_compiler::h9744adc14d83069fR8b
  20:     0x7f9ce85e54e0 - thunk::F.Invoke<A, R>::invoke::h4743467232418998746
  21:     0x7f9ce85e4440 - rt::unwind::try::try_fn::h14171547017825018159
  22:     0x7f9ce8046040 - rust_try_inner
  23:     0x7f9ce8046030 - rust_try
  24:     0x7f9ce85e46f0 - thunk::F.Invoke<A, R>::invoke::h16899136376829984014
  25:     0x7f9ce7fc74d0 - sys::thread::thread_start::h7e7f9bf2088d1750X6w
  26:     0x7f9ce2234fe0 - start_thread
  27:     0x7f9ce7bd0c99 - __clone
  28:                0x0 - <unknown>

[Hinogary]

Same error with this code:

fn twice<T: Add<T>>(v: T) -> Add<T>::Output{
    v+v
}

[rrichardson]

Wow! I think we have a repro-golf winner. :)

(that does repro on play: http://is.gd/G0Q5OA)

[mitchmindtree]

Also hitting this one on the latest nightly:

rustc 1.0.0-nightly (1d00c545e 2015-01-30 19:56:34 +0000)

The code's a little much to share but I thought I'd share the stack trace at least and give this a bump anyways:

Compiling dsp-chain v0.0.0 (file:///Users/Mitch/Programming/Rust/dsp-chain)
src/node.rs:69:35: 69:47 error: mismatched types:
 expected `&mut <node::Node as node::Node>::Buffer`,
    found `&mut <Self as node::Node>::Buffer`
(expected trait node::Node,
    found Self) [E0308]
src/node.rs:69             input.audio_requested(&mut working, settings);
                                                 ^~~~~~~~~~~~
ERROR:rbml::reader: failed to find block with tag 7
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/librbml/lib.rs:266

stack backtrace:
   1:        0x109d07cd7 - sys::backtrace::write::h4ee5c5ad264b65f5mbu
   2:        0x109d2de9c - failure::on_fail::h55e5ff39107f11fcHbB
   3:        0x109c8f618 - rt::unwind::begin_unwind_inner::habba3c5d37f59591DTA
   4:        0x1092c1454 - rt::unwind::begin_unwind::h15939399727117421951
   5:        0x1092bffe4 - reader::get_doc::h0276305dd2ee2970nLa
   6:        0x1071088e8 - metadata::decoder::item_type::heedfd52684953eeaTqh
   7:        0x107119d51 - metadata::decoder::get_type::h2931af7f8c7c3e42uDh
   8:        0x106f6871d - middle::ty::lookup_item_type::ha73f50b132016f83P46
   9:        0x10691fcdb - check::FnCtxt<'a, 'tcx>.AstConv<'tcx>::get_item_type_scheme::h12679af05f759596hTm
  10:        0x1069acac7 - astconv::ast_path_to_ty::h57df746a8fa80a7b3It
  11:        0x1069b0cd9 - astconv::ast_ty_to_ty::closure.32669
  12:        0x106948550 - astconv::ast_ty_to_ty::h8d7cfb197a62e3f6N9t
  13:        0x1069424fd - check::check_cast::h78db49c38d52a23edOm
  14:        0x1069752f8 - check::check_expr_with_unifier::h16292217873934053862
  15:        0x10698c62c - check::check_expr_with_unifier::h11019213537881022167
  16:        0x10693cd26 - check::check_block_with_expected::h951febd74f526f5c7Mq
  17:        0x10696459e - check::check_block_no_value::h03e1e2535bed2e50bMq
  18:        0x10697399e - check::check_expr_with_unifier::h16292217873934053862
  19:        0x10693cfdf - check::check_block_with_expected::h951febd74f526f5c7Mq
  20:        0x10696459e - check::check_block_no_value::h03e1e2535bed2e50bMq
  21:        0x10697399e - check::check_expr_with_unifier::h16292217873934053862
  22:        0x10693cfdf - check::check_block_with_expected::h951febd74f526f5c7Mq
  23:        0x10696459e - check::check_block_no_value::h03e1e2535bed2e50bMq
  24:        0x10696d6fb - check::check_expr_with_unifier::h16914743892577524087
  25:        0x10693cc54 - check::check_block_with_expected::h951febd74f526f5c7Mq
  26:        0x106921508 - check::check_fn::h676b72eb902b2f23e1l
  27:        0x10693998f - check::check_bare_fn::h3a34bba2748b9e14GQl
  28:        0x10693d83c - check::check_method_body::h2d16a6bb30bdd699Nmm
  29:        0x10693469a - check::check_item::h2a002d682f8542d2j9l
  30:        0x1069375b2 - visit::walk_item::h521929741097464564
  31:        0x106a00ede - check_crate::closure.33893
  32:        0x1069fc42f - check_crate::hafc86ed9389e97e5IEz
  33:        0x1063b33b5 - driver::phase_3_run_analysis_passes::h5b5e8dbf669c7bf9NFa
  34:        0x106399a7c - driver::compile_input::h8e0204b8bb9ea44bBba
  35:        0x106462d3e - run_compiler::h322f9334a9a1d7e6l9b
  36:        0x10645fd7f - thunk::F.Invoke<A, R>::invoke::h14356237310415989951
  37:        0x10645ea10 - rt::unwind::try::try_fn::h798029436104877783
  38:        0x109da4329 - rust_try_inner
  39:        0x109da4316 - rust_try
  40:        0x10645f0d4 - thunk::F.Invoke<A, R>::invoke::h15628186897385384602
  41:        0x109d18553 - sys::thread::thread_start::h3f48e8c893476626A3w
  42:     0x7fff99505268 - _pthread_body
  43:     0x7fff995051e5 - _pthread_body

Could not compile `dsp-chain`.

[nicklan]

Also hitting the same/similar issue.

Code:

use std::str::FromStr;

fn foo<T: std::str::FromStr> (s: &str) {
    let t: Result<T,FromStr::Err> = FromStr::from_str(s);
}

fn main() { }

Backtrace:

ERROR:rbml::reader: failed to find block with tag 7
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'explicit panic', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librbml/lib.rs:266

stack backtrace:
   1:     0x7f2fcf698e80 - sys::backtrace::write::h84a1347ec8a3d425Aru
   2:     0x7f2fcf6bc4a0 - failure::on_fail::h1cb2299eb5e255ae9GB
   3:     0x7f2fcf6272d0 - rt::unwind::begin_unwind_inner::ha34a1c7f0630f466IlB
   4:     0x7f2fc8949570 - rt::unwind::begin_unwind::h11618834637780193760
   5:     0x7f2fc8948300 - reader::get_doc::hef77d659484c11a8nLa
   6:     0x7f2fcd950680 - metadata::decoder::item_type::h10f15a8b3984e7dcImi
   7:     0x7f2fcd961580 - metadata::decoder::get_type::h6f32069ab233c7c2jzi
   8:     0x7f2fcd7b8980 - middle::ty::lookup_item_type::h1544033676167d0cHM7
   9:     0x7f2fcee19b90 - check::FnCtxt<'a, 'tcx>.AstConv<'tcx>::get_item_type_scheme::h8a97d062f4aba1bftFn
  10:     0x7f2fceea80f0 - astconv::ast_path_to_ty::h2afb38f1cee6231cCxu
  11:     0x7f2fceea95e0 - astconv::ast_ty_to_ty::closure.33343
  12:     0x7f2fcee44b80 - astconv::ast_ty_to_ty::h848838ea974461b5AYu
  13:     0x7f2fceea17a0 - vec::Vec<T>.FromIterator<T>::from_iter::h13927799770275079786
  14:     0x7f2fcee9f3d0 - astconv::convert_angle_bracketed_parameters::h212169f719b8570cA6t
  15:     0x7f2fcee445f0 - astconv::ast_path_substs_for_ty::h21ba53d4a8da23ffyVt
  16:     0x7f2fceea80f0 - astconv::ast_path_to_ty::h2afb38f1cee6231cCxu
  17:     0x7f2fceea95e0 - astconv::ast_ty_to_ty::closure.33343
  18:     0x7f2fcee44b80 - astconv::ast_ty_to_ty::h848838ea974461b5AYu
  19:     0x7f2fcee37cd0 - check::GatherLocalsVisitor<'a, 'tcx>.Visitor<'tcx>::visit_local::h18f4f372c2aa7e2adEm
  20:     0x7f2fcee1a090 - check::check_fn::h342cf6090c0fe3a6bLm
  21:     0x7f2fcee36680 - check::check_bare_fn::h306f8ecc226858bctAm
  22:     0x7f2fcee2de70 - check::check_item::h7d555ba822408851KTm
  23:     0x7f2fceefcd10 - check_crate::closure.34569
  24:     0x7f2fceef7850 - check_crate::h2469153404b647bauEA
  25:     0x7f2fcfc29710 - driver::phase_3_run_analysis_passes::h198ed79d6101094dtGa
  26:     0x7f2fcfc102b0 - driver::compile_input::h08caf95be513bd6bBba
  27:     0x7f2fcfcdadd0 - run_compiler::hf1a36c26381910e09ac
  28:     0x7f2fcfcd9460 - thunk::F.Invoke<A, R>::invoke::h6996223324138754953
  29:     0x7f2fcfcd8390 - rt::unwind::try::try_fn::h16059966258548481805
  30:     0x7f2fcf727910 - rust_try_inner
  31:     0x7f2fcf727900 - rust_try
  32:     0x7f2fcfcd8640 - thunk::F.Invoke<A, R>::invoke::h12998514134271589737
  33:     0x7f2fcf6a8ca0 - sys::thread::thread_start::h756cedb2df1b4200Pnx
  34:     0x7f2fc98c8250 - start_thread
  35:     0x7f2fcf2b9219 - clone
  36:                0x0 - <unknown>

rustc 1.0.0-nightly (eaf4c5c 2015-02-02 15:04:54 +0000)
binary: rustc
commit-hash: eaf4c5c
commit-date: 2015-02-02 15:04:54 +0000
host: x86_64-unknown-linux-gnu
release: 1.0.0-nightly