Issue 1:
I got this code, a simplified form of what I saw in the Guide (section Testing):

fn three_times_four() -> int { 3 * 4 }

#[test]
fn test_1() {
assert_eq!(12, three_times_four());
}

#[cfg(test)]
mod test {
use super::three_times_four;

#[test]
fn test_2() {
assert!(12, three_times_four())
}
}

And running it:

$ rustc --version
rustc 0.12.0-pre (471862f40 2014-08-24 09:30:56 +0000)
$ uname --all
Linux thome 3.15-trunk-amd64 #1 SMP Debian 3.15.1-1~exp1 (2014-06-20) x86_64 GNU/Linux
$ RUST_BACKTRACE=1 rustc --test main.rs
<std macros>:8:12: 14:19 error: mismatched types: expected `bool` but found `<generic integer #0>` (expected bool but found integral variable)
<std macros>:8 if !$cond {
<std macros>:9 fail!($($arg),+)
<std macros>:10 }
<std macros>:11 );
<std macros>:12 )
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. 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
task 'rustc' failed at 'index out of bounds: the len is 12 but the index is 12', /home/tshepang/projects/rust/src/libsyntax/lib.rs:1

stack backtrace:
1: 0x7f0cb4473480 - rt::backtrace::imp::write::h235035dd269e20b4UYq
2: 0x7f0cb4476630 - failure::on_fail::hd1a7e992688ab3ceBkr
3: 0x7f0cb8a28e40 - unwind::begin_unwind_inner::hb4c6bf8d66435096pie
4: 0x7f0cb8a28b40 - unwind::begin_unwind_fmt::h86f5356db6ec628ePfe
5: 0x7f0cb8a28b00 - rust_begin_unwind
6: 0x7f0cb8a77800 - failure::begin_unwind::h7b5a533fc9421dfbnAk
7: 0x7f0cb8a7a7c0 - failure::fail_bounds_check::h2e800593d4e78a44zyk
8: 0x7f0cb758dee0 - codemap::FileMap::get_line::hddd51750c3eea6b5EyE
9: 0x7f0cb7597f50 - diagnostic::emit::h17d12cac27463098tVF
10: 0x7f0cb7594e70 - diagnostic::EmitterWriter.Emitter::emit::h072471d33cf09c1a0QF
11: 0x7f0cb75931f0 - diagnostic::Handler::emit::h5ef2540673a3b36epyF
12: 0x7f0cb758cae0 - diagnostic::SpanHandler::span_err::haa1d6440e60b94bbEmF
13: 0x7f0cb9593990 - middle::typeck::infer::InferCtxt<'a>::type_error_message_str_with_expected::hecddb89bcc2602a1Pdc
14: 0x7f0cb9632e50 - middle::typeck::infer::InferCtxt<'a>::type_error_message::h82a8041df2114fa6glc
15: 0x7f0cb9633060 - middle::typeck::infer::InferCtxt<'a>::report_mismatched_types::he1a60d697010400emmc
16: 0x7f0cb95e6580 - middle::typeck::check::demand::suptype::closure.122490
17: 0x7f0cb95e6490 - middle::typeck::check::demand::suptype_with_fn::h36e7cd05f630094aISO
18: 0x7f0cb9642be0 - middle::typeck::check::check_expr_has_type::closure.123466
19: 0x7f0cb9637df0 - middle::typeck::check::check_expr_with_unifier::h532c026a98936bd1cxU
20: 0x7f0cb9637df0 - middle::typeck::check::check_expr_with_unifier::h532c026a98936bd1cxU
21: 0x7f0cb9604850 - middle::typeck::check::check_block_with_expected::hcc1fb6e3f987aab0VFW
22: 0x7f0cb96009d0 - middle::typeck::check::check_fn::haf17c837a63ca21aYOR
23: 0x7f0cb96006f0 - middle::typeck::check::check_bare_fn::h1697162caded9650DDR
24: 0x7f0cb95f98d0 - middle::typeck::check::check_item::h3c5ed16ca47f89b7KbS
25: 0x7f0cb95fb5d0 - visit::walk_item::h13949830449449897568
26: 0x7f0cb96004f0 - middle::typeck::check::check_item_types::h86b08addca7a3d44UCR
27: 0x7f0cb907c880 - util::common::time::h7845477028010386476
28: 0x7f0cb97de3e0 - middle::typeck::check_crate::hca6bcc1827718082koi
29: 0x7f0cb98a0660 - driver::driver::phase_3_run_analysis_passes::ha18773997d369cedkSw
30: 0x7f0cb989b800 - driver::driver::compile_input::h83dff1ab89a68b6eqEw
31: 0x7f0cb992f8d0 - driver::run_compiler::hf037f9b7b9d7b27ejbA
32: 0x7f0cb992f7e0 - driver::main_args::closure.137206
33: 0x7f0cb99416b0 - task::TaskBuilder<S>::try_future::closure.138326
34: 0x7f0cb99414b0 - task::TaskBuilder<S>::spawn_internal::closure.138303
35: 0x7f0cb8d91640 - task::spawn_opts::closure.8268
36: 0x7f0cb8a89d20 - rust_try_inner
37: 0x7f0cb8a89d10 - rust_try
38: 0x7f0cb8a264b0 - unwind::try::h4632958e716dfba1F6d
39: 0x7f0cb8a26250 - task::Task::run::h717f2b1ef13686ffZcd
40: 0x7f0cb8d91400 - task::spawn_opts::closure.8214
41: 0x7f0cb8a28090 - thread::thread_start::h8bc121b89a283d9aLBd
42: 0x7f0cb37f2fe0 - start_thread
43: 0x7f0cb86f6f89 - __clone
44: 0x0 - <unknown>

Fixing the typo (assert -> assert_eq) builds without an issue.

Issue 2:
Believed current test case

(pnkfelix says: "if you are looking at this bug, please try to keep this test up-to-date ... potentially by checking the newest linked dupes in the comment feed below.")

// Very

// sensitive
pub struct BytePos(pub u32);

// to particular

// line numberings / offsets

fn main() {
let x = BytePos(1);

assert!(x, x);
}

Original Bug Filed

Script to reproduce:

fn main() {
// if any comment line is removed, the ICE disappears
// adding more lines keep the ICE alive
//
//
//
//
//
//
//
//
//
assert!(vec!(1.0), vec!(1.0))
}

Backtrace:

$ RUST_BACKTRACE=1 rustc ice.rs
<std macros>:8:12: 13:23 error: cannot apply unary operator `!` to type `std::vec::Vec<<generic float #0>>`
<std macros>:8 if !$cond {
<std macros>:9 fail!($($arg),+)
<std macros>:10 }
<std macros>:11 );
<std macros>:12 )
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://static.rust-lang.org/doc/master/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'index out of bounds: the len is 12 but the index is 12', /var/tmp/paludis/build/dev-lang-rust-scm/work/rust-scm/src/libsyntax/lib.rs:1
stack backtrace:
1: 0x7f0c3dda8180 - rt::backtrace::imp::write::h706b65acfe967902xTF::v0.11.pre
2: 0x7f0c3dd11730 - rt::unwind::begin_unwind_inner::hcc57db58853efcfdAtF::v0.11.pre
3: 0x7f0c3dda7e10 - <unknown>
4: 0x7f0c3dda7d30 - rust_fail_bounds_check
5: 0x7f0c3ddb9a90 - failure::fail_bounds_check::h8ed58f060b870dd6EwF::v0.11.pre
6: 0x7f0c3d1d80f0 - codemap::FileMap::get_line::hbf104ad3bfda6f77Drd::v0.11.pre
7: 0x7f0c3d1d4e90 - <unknown>
8: 0x7f0c3d1ccd40 - diagnostic::EmitterWriter.Emitter::emit::h7c42f3840a82760aQcc::v0.11.pre
9: 0x7f0c3d1c9f90 - diagnostic::Handler::emit::h971cc5635478154dV0b::v0.11.pre
10: 0x7f0c3d1c8ec0 - diagnostic::SpanHandler::span_err::h3735f152282993cc3Sb::v0.11.pre
11: 0x7f0c3eadda90 - middle::typeck::infer::InferCtxt<'a>::type_error_message_str_with_expected::he1b302cd7901cc2apJq::v0.11.pre
12: 0x7f0c3eb7f0e0 - middle::typeck::infer::InferCtxt<'a>::type_error_message::h6e536a01d806a7af7Qq::v0.11.pre
13: 0x7f0c3eb8d9f0 - <unknown>
14: 0x7f0c3eb8b250 - <unknown>
15: 0x7f0c3eb8d650 - <unknown>
16: 0x7f0c3eb7fb20 - <unknown>
17: 0x7f0c3eb7fb20 - <unknown>
18: 0x7f0c3eb5fd00 - middle::typeck::check::check_block_with_expected::hec61a0d86b711c5ck7c::v0.11.pre
19: 0x7f0c3eb5af90 - <unknown>
20: 0x7f0c3eb5ad30 - <unknown>
21: 0x7f0c3eb53790 - middle::typeck::check::check_item::he7c19452bac809220R8::v0.11.pre
22: 0x7f0c3eb5ab30 - middle::typeck::check::check_item_types::hca38e25e2d3c1969ek8::v0.11.pre
23: 0x7f0c3ec9d280 - <unknown>
24: 0x7f0c3ec9c090 - middle::typeck::check_crate::h540b9b663571145fQgw::v0.11.pre
25: 0x7f0c3f0e8e90 - driver::driver::phase_3_run_analysis_passes::h129732fc31300f8bbei::v0.11.pre
26: 0x7f0c3f0eef10 - driver::driver::compile_input::h36b4d97be6c65511gEi::v0.11.pre
27: 0x7f0c3f1143c0 - run_compiler::hd111892d49d8dfe1saq::v0.11.pre
28: 0x7f0c3f12ffb0 - <unknown>
29: 0x7f0c3f12e860 - <unknown>
30: 0x7f0c3f129020 - <unknown>
31: 0x7f0c3e2ce670 - <unknown>
32: 0x7f0c3dd9f430 - <unknown>
33: 0x7f0c3ddc04a0 - rust_try
34: 0x7f0c3dd9f270 - rt::task::Task::run::hd2e6ec18f16de5eeiiD::v0.11.pre
35: 0x7f0c3e2ce440 - <unknown>
36: 0x7f0c3dda6c60 - <unknown>
37: 0x7f0c3ba9c000 - start_thread
38: 0x7f0c3d9e43d9 - clone
39: 0x0 - <unknown>

Version:

$ rustc --version
rustc 0.11-pre (1001635 2014-05-10 09:56:34 -0700)
host: x86_64-unknown-linux-gnu