LLVM assertion: assertion failed: index < LLVMCountParams(llfn)

[japaric]

STR

// reduced version of `test_collect` in src/coretest/{option,result}.rs

fn main() {
    let functions: [Box<Fn() -> Option<()>>; 1] = [box || None];

    let _: Option<Vec<()>> = functions.iter().map(|f| (*f)()).collect();
}

Backtrace

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 'assertion failed: index < LLVMCountParams(llfn)', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustc_llvm/lib.rs:2180

stack backtrace:
   1:     0x7fc7bb7bd920 - sys::backtrace::write::h36422e877a8b3158yQs
   2:     0x7fc7bb7e3650 - failure::on_fail::hde5005d61795902da3y
   3:     0x7fc7bb7494a0 - rt::unwind::begin_unwind_inner::ha0668a3a9d73b9a7RHy
   4:     0x7fc7b74729d0 - rt::unwind::begin_unwind::h14477328803464112959
   5:     0x7fc7b74738c0 - get_param::hc2a602389748493aHZc
   6:     0x7fc7ba71e3e0 - trans::meth::trans_object_shim::h5f4a45036c920561jBz
   7:     0x7fc7ba624420 - trans::meth::trans_method_callee::h5b6017c8ff0cdabeq6y
   8:     0x7fc7ba68de30 - trans::callee::trans_call_inner::h9570217261815687510
   9:     0x7fc7ba6547f0 - trans::expr::trans_rvalue_dps_unadjusted::he4bc827113312f77JWi
  10:     0x7fc7ba60d640 - trans::expr::trans_into::hc0349db49beb27737xh
  11:     0x7fc7ba60ddd0 - trans::controlflow::trans_block::h174785cd924262f8S1d
  12:     0x7fc7ba6d90a0 - trans::base::trans_closure::hfe41dcc40403de39MSt
  13:     0x7fc7ba6547f0 - trans::expr::trans_rvalue_dps_unadjusted::he4bc827113312f77JWi
  14:     0x7fc7ba653630 - trans::expr::trans_unadjusted::h92a64e3d533ab991qki
  15:     0x7fc7ba60e940 - trans::expr::trans::h6c51adc6031aa4b0BBh
  16:     0x7fc7ba61d0f0 - trans::callee::trans_args::h1c22cd35a1fbcd555bh
  17:     0x7fc7ba650d40 - trans::callee::trans_call_inner::h526206399124275916
  18:     0x7fc7ba6547f0 - trans::expr::trans_rvalue_dps_unadjusted::he4bc827113312f77JWi
  19:     0x7fc7ba653630 - trans::expr::trans_unadjusted::h92a64e3d533ab991qki
  20:     0x7fc7ba60e940 - trans::expr::trans::h6c51adc6031aa4b0BBh
  21:     0x7fc7ba61d0f0 - trans::callee::trans_args::h1c22cd35a1fbcd555bh
  22:     0x7fc7ba650d40 - trans::callee::trans_call_inner::h526206399124275916
  23:     0x7fc7ba6547f0 - trans::expr::trans_rvalue_dps_unadjusted::he4bc827113312f77JWi
  24:     0x7fc7ba653630 - trans::expr::trans_unadjusted::h92a64e3d533ab991qki
  25:     0x7fc7ba60e940 - trans::expr::trans::h6c51adc6031aa4b0BBh
  26:     0x7fc7ba60cc40 - trans::base::init_local::h47b20c6d8c11ad44V1s
  27:     0x7fc7ba60ddd0 - trans::controlflow::trans_block::h174785cd924262f8S1d
  28:     0x7fc7ba6d90a0 - trans::base::trans_closure::hfe41dcc40403de39MSt
  29:     0x7fc7ba5f9040 - trans::base::trans_fn::h6d916c16d129710bj3t
  30:     0x7fc7ba5f4240 - trans::base::trans_item::h2031a94ddea1dc4daqu
  31:     0x7fc7ba6e1b50 - trans::base::trans_crate::ha120df8a851d469bvlv
  32:     0x7fc7bbd0d210 - driver::phase_4_translate_to_llvm::ha02a86bcc78503d8uFa
  33:     0x7fc7bbcecaa0 - driver::compile_input::h8d0abf631800220evba
  34:     0x7fc7bbdb8070 - thunk::F.Invoke<A, R>::invoke::h13263903969514368718
  35:     0x7fc7bbdb6e20 - rt::unwind::try::try_fn::h2272437873322108176
  36:     0x7fc7bb8478b0 - rust_try_inner
  37:     0x7fc7bb8478a0 - rust_try
  38:     0x7fc7bbdb7170 - thunk::F.Invoke<A, R>::invoke::h17236552692728063371
  39:     0x7fc7bb7cf490 - sys::thread::thread_start::hd19c7749b7af23e8EGv
  40:     0x7fc7b5e47250 - start_thread
  41:     0x7fc7bb404219 - clone
  42:                0x0 - <unknown>

Version

rustc 0.13.0-nightly (ad9e75938 2015-01-05 00:26:28 +0000)

cc @nikomatsakis