<p dir="auto">This code causes ICE after recent rust changes:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="use std::default::Default;

pub trait Message {
    fn new() -&gt; Self { panic!(); }
}

fn new_instance&lt;M : 'static + Message&gt;() -&gt; Box&lt;Message + 'static&gt; {
    let m: M = Default::default();
    box m as Box&lt;Message&gt;
}

fn main() {}"><pre class="notranslate"><code class="notranslate">use std::default::Default;

pub trait Message {
    fn new() -&gt; Self { panic!(); }
}

fn new_instance&lt;M : 'static + Message&gt;() -&gt; Box&lt;Message + 'static&gt; {
    let m: M = Default::default();
    box m as Box&lt;Message&gt;
}

fn main() {}
</code></pre></div>
<p dir="auto">This is minimal example I can think of.</p>
<p dir="auto">Error is:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="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
task 'rustc' panicked at 'assertion failed: *start &lt;= *end', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libcore/slice.rs:396

stack backtrace:
   1:        0x10c899619 - rt::backtrace::imp::write::h03fee16d4a0b6b41moq
   2:        0x10c89c85c - failure::on_fail::h3e0f6b3c6c4bbcc3VEq
   3:        0x10caf9f05 - unwind::begin_unwind_inner::h6c7f4532e72658d7SJd
   4:        0x10caf9b9f - unwind::begin_unwind_fmt::h9863b25c438d6314kHd
   5:        0x10caf98f2 - rust_begin_unwind
   6:        0x10cb5053c - panicking::panic_fmt::hc53a414d3d53805bi7j
   7:        0x10cb46f6f - panicking::panic::h5cf45d77d6cb56acm4j
   8:        0x109a8f83b - middle::typeck::check::vtable::check_object_safety::h3ee32f70bc2a6910cvN
   9:        0x109a8eab4 - middle::typeck::check::vtable::check_object_cast::ha17cfa6c915c29failN
  10:        0x109af7954 - middle::typeck::check::check_cast::h212d4526506e607bdwW
  11:        0x109b1fae4 - middle::typeck::check::check_expr_with_unifier::h153e2ccf9b0cb061XCY
  12:        0x109aeb2d1 - middle::typeck::check::check_block_with_expected::heb9a0fb2300c4559PJ0
  13:        0x109ae6d42 - middle::typeck::check::check_fn::h0449d63e5b4f3e3a9oV
  14:        0x109ae626f - middle::typeck::check::check_bare_fn::hf2de12c52654551eoeV
  15:        0x109ae218d - middle::typeck::check::check_item::hfaeea23703d7dd28xyV
  16:        0x109ae60bf - middle::typeck::check::check_item_types::haaff85b74e988d92ydV
  17:        0x1095fc556 - util::common::time::h11920059333862041717
  18:        0x109da659e - middle::typeck::check_crate::h50fcc5c8b39993f4LVn
  19:        0x109e0ebcf - driver::driver::phase_3_run_analysis_passes::h1425a4ca465c7b097DA
  20:        0x109e092b8 - driver::driver::compile_input::h60bc42ef7fabbfd4SkA
  21:        0x109e86ca8 - driver::run_compiler::h4031243f49082a9fw7D
  22:        0x109e84ece - driver::run::closure.145349
  23:        0x10961481b - task::TaskBuilder&lt;S&gt;::try_future::closure.103709
  24:        0x109614713 - task::TaskBuilder&lt;S&gt;::spawn_internal::closure.103680
  25:        0x10959798d - task::NativeSpawner.Spawner::spawn::closure.8526
  26:        0x10cb6020c - rust_try_inner
  27:        0x10cb601f6 - rust_try
  28:        0x10caf7677 - unwind::try::hab84862d0081b274cyd
  29:        0x10caf750c - task::Task::run::h39093ecd59554b49ZJc
  30:        0x1095977b3 - task::NativeSpawner.Spawner::spawn::closure.8463
  31:        0x10caf8d37 - thread::thread_start::h589be8c0a398d299e5c
  32:     0x7fff993572fc - _pthread_body
  33:     0x7fff99357279 - _pthread_body"><pre class="notranslate"><code class="notranslate">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
task 'rustc' panicked at 'assertion failed: *start &lt;= *end', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libcore/slice.rs:396

stack backtrace:
   1:        0x10c899619 - rt::backtrace::imp::write::h03fee16d4a0b6b41moq
   2:        0x10c89c85c - failure::on_fail::h3e0f6b3c6c4bbcc3VEq
   3:        0x10caf9f05 - unwind::begin_unwind_inner::h6c7f4532e72658d7SJd
   4:        0x10caf9b9f - unwind::begin_unwind_fmt::h9863b25c438d6314kHd
   5:        0x10caf98f2 - rust_begin_unwind
   6:        0x10cb5053c - panicking::panic_fmt::hc53a414d3d53805bi7j
   7:        0x10cb46f6f - panicking::panic::h5cf45d77d6cb56acm4j
   8:        0x109a8f83b - middle::typeck::check::vtable::check_object_safety::h3ee32f70bc2a6910cvN
   9:        0x109a8eab4 - middle::typeck::check::vtable::check_object_cast::ha17cfa6c915c29failN
  10:        0x109af7954 - middle::typeck::check::check_cast::h212d4526506e607bdwW
  11:        0x109b1fae4 - middle::typeck::check::check_expr_with_unifier::h153e2ccf9b0cb061XCY
  12:        0x109aeb2d1 - middle::typeck::check::check_block_with_expected::heb9a0fb2300c4559PJ0
  13:        0x109ae6d42 - middle::typeck::check::check_fn::h0449d63e5b4f3e3a9oV
  14:        0x109ae626f - middle::typeck::check::check_bare_fn::hf2de12c52654551eoeV
  15:        0x109ae218d - middle::typeck::check::check_item::hfaeea23703d7dd28xyV
  16:        0x109ae60bf - middle::typeck::check::check_item_types::haaff85b74e988d92ydV
  17:        0x1095fc556 - util::common::time::h11920059333862041717
  18:        0x109da659e - middle::typeck::check_crate::h50fcc5c8b39993f4LVn
  19:        0x109e0ebcf - driver::driver::phase_3_run_analysis_passes::h1425a4ca465c7b097DA
  20:        0x109e092b8 - driver::driver::compile_input::h60bc42ef7fabbfd4SkA
  21:        0x109e86ca8 - driver::run_compiler::h4031243f49082a9fw7D
  22:        0x109e84ece - driver::run::closure.145349
  23:        0x10961481b - task::TaskBuilder&lt;S&gt;::try_future::closure.103709
  24:        0x109614713 - task::TaskBuilder&lt;S&gt;::spawn_internal::closure.103680
  25:        0x10959798d - task::NativeSpawner.Spawner::spawn::closure.8526
  26:        0x10cb6020c - rust_try_inner
  27:        0x10cb601f6 - rust_try
  28:        0x10caf7677 - unwind::try::hab84862d0081b274cyd
  29:        0x10caf750c - task::Task::run::h39093ecd59554b49ZJc
  30:        0x1095977b3 - task::NativeSpawner.Spawner::spawn::closure.8463
  31:        0x10caf8d37 - thread::thread_start::h589be8c0a398d299e5c
  32:     0x7fff993572fc - _pthread_body
  33:     0x7fff99357279 - _pthread_body
</code></pre></div>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="% rustc --version
rustc 0.13.0-nightly (88b6e93d3 2014-10-31 23:36:48 +0000)
% uname
Darwin"><pre class="notranslate"><code class="notranslate">% rustc --version
rustc 0.13.0-nightly (88b6e93d3 2014-10-31 23:36:48 +0000)
% uname
Darwin
</code></pre></div>
<p dir="auto">I'm getting the following ICE</p>
<div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="
mindTree:RustyJen Mitch$ cargo build                                                                               
   Compiling jen v0.0.0 (file:///Users/Mitch/Programming/Rust/RustyJen)                                            
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                                                                  
task 'rustc' panicked at 'assertion failed: *start &lt;= *end', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/b
uild/src/libcore/slice.rs:396                                                                                      
"><pre class="notranslate">mindTree:RustyJen Mitch$ cargo build                                                                               
   Compiling jen v0.0.0 (file:///Users/Mitch/Programming/Rust/RustyJen)                                            
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 <span class="pl-s"><span class="pl-pds">`</span>RUST_BACKTRACE=1<span class="pl-pds">`</span></span> <span class="pl-k">for</span> a backtrace                                                                  
task <span class="pl-s"><span class="pl-pds">'</span>rustc<span class="pl-pds">'</span></span> panicked at <span class="pl-s"><span class="pl-pds">'</span>assertion failed: *start &lt;= *end<span class="pl-pds">'</span></span>, /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/b
uild/src/libcore/slice.rs:396                                                                                      
</pre></div>
<p dir="auto">when compiling my project against the latest OSX nightly <code class="notranslate">rustc 0.13.0-nightly (221fc1e3c 2014-10-31 02:27:15 +0000)</code>.</p>