rustc internal compiler error: 'RefCell<T> already borrowed'

[carllerche]

repro:

use std::u8;

static NUM: uint = u8::MAX as uint;

struct MyStruct {
  nums: [uint, ..256]
}

fn main() {
  let s = MyStruct { nums: [0, ..NUM] };
  println!("num {:?}", s);
}

backtrace:

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 'RefCell<T> already borrowed', /Users/carllerche/Code/oss/rust/src/libstd/cell.rs:158
stack backtrace:
   1:        0x10b3eee34 - rt::backtrace::imp::write::ha3f7ca69ee3354a5bCa::v0.11.pre
   2:        0x10b350f1e - rt::unwind::begin_unwind_inner::hc289551459a61c06hca::v0.11.pre
   3:        0x10873bb58 - rt::unwind::begin_unwind::h6565109718362079134::v0.11.pre
   4:        0x108d6bc87 - middle::astencode::decode_side_tables::closure.81006
   5:        0x10b095d30 - ebml::reader::docs::h665a98cd2ba14580wVe::v0.11.pre
   6:        0x10873e23d - middle::astencode::decode_inlined_item::h1a37eac7edc8c432RJR::v0.11.pre
   7:        0x108bf927b - middle::const_eval::lookup_const_by_id::closure.72988
   8:        0x108e7d2fc - metadata::decoder::maybe_get_item_ast::hb548b738bacfd640qeb::v0.11.pre
   9:        0x1088360a8 - middle::const_eval::lookup_const_by_id::h8899505373862d4dQ5Q::v0.11.pre
  10:        0x108861703 - middle::const_eval::lookup_const::h794169b85e5d439eI1Q::v0.11.pre
  11:        0x10885d895 - middle::const_eval::eval_const_expr_partial::h14321642868329550466::v0.11.pre
  12:        0x10885ddcf - middle::const_eval::eval_const_expr_partial::h14321642868329550466::v0.11.pre
  13:        0x108a0ef1b - middle::const_eval::eval_const_expr_partial::h13343781683720287911::v0.11.pre
  14:        0x108a0e829 - middle::ty::eval_repeat_count::h17378899464118624781::v0.11.pre
  15:        0x1089fa237 - middle::typeck::check::check_expr_with_unifier::h676f69ce3093b2d2cH9::v0.11.pre
  16:        0x108a0c52b - middle::typeck::check::check_expr_with_unifier::check_struct_or_variant_fields::h7be3b1077889f8bfkJa::v0.11.pre
  17:        0x1089ffb7f - middle::typeck::check::check_expr_with_unifier::h676f69ce3093b2d2cH9::v0.11.pre
  18:        0x108a13967 - middle::typeck::check::check_decl_local::h3d186907e0b8709fLWb::v0.11.pre
  19:        0x108a13c23 - middle::typeck::check::check_stmt::ha7692016058c4f1fIYb::v0.11.pre
  20:        0x1089d9555 - middle::typeck::check::check_block_with_expected::h562888ff8e3bd597F2b::v0.11.pre
  21:        0x1089d54e9 - middle::typeck::check::check_fn::h0bbaa66e10309365rw7::v0.11.pre
  22:        0x1089d4d1a - middle::typeck::check::check_bare_fn::h246b288fee103f44im7::v0.11.pre
  23:        0x1089ccd16 - middle::typeck::check::check_item::h48f276e2de542153FS7::v0.11.pre
  24:        0x1089d4aad - middle::typeck::check::check_item_types::h760ba130ac32d380Al7::v0.11.pre
  25:        0x108b0851f - util::common::time::h11105521565483743252::v0.11.pre
  26:        0x108b0744d - middle::typeck::check_crate::h792ad73b11a6a16aCQu::v0.11.pre
  27:        0x108f20a44 - driver::driver::phase_3_run_analysis_passes::h9009e318738b0d3a9tf::v0.11.pre
  28:        0x108f274eb - driver::driver::compile_input::hed4f3beb6c0afdbfMSf::v0.11.pre
  29:        0x108f4c850 - run_compiler::h1cf1e0f4a610f7f6bpn::v0.11.pre
  30:        0x108f606cd - main_args::closure.91482
  31:        0x108f5ea62 - monitor::closure.91357
  32:        0x108f5a5ab - task::TaskBuilder::try::closure.91123
  33:        0x10870549c - task::spawn_opts::closure.7113
  34:        0x10b3e9f38 - rt::task::Task::run::closure.40068
  35:        0x10b3f3cac - rust_try
  36:        0x10b3e9db7 - rt::task::Task::run::h5708e690b07fd669j37::v0.11.pre
  37:        0x10870531f - task::spawn_opts::closure.7085
  38:        0x10b3ed806 - rt::thread::thread_start::h02d275e99b3ee9de4H8::v0.11.pre
  39:     0x7fff8e14e772 - _pthread_start

version:

rustc 0.11-pre (bb580f1 2014-04-23 05:51:30 -0700)
host: x86_64-apple-darwin