Trying to compile this code with `rustc lib.rs` generate a internal compiler error with rust-nightly (4e7c5e5c)

lib.rs

#![crate_name = "xmpp"]
#![crate_type = "lib"]

pub fn handle() {
    loop { }
    println!("we close");
}

stack trace

lib.rs:6:14: 6:24 warning: unreachable statement, #[warn(unreachable_code)] on by default
lib.rs:6     println!("we close");
                      ^~~~~~~~~~
note: in expansion of format_args!
<std macros>:2:23: 2:77 note: expansion site
<std macros>:1:1: 3:2 note: in expansion of println!
lib.rs:6:5: 6:26 note: expansion site
error: internal compiler error: encode_symbol: id not found 16
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 'Box<Any>', /build/buildd/rust-nightly-201407260406~cf1381c~trusty/src/libsyntax/ast_util.rs:784

stack backtrace:
   1: 0xb60fc9d0 - rt::backtrace::imp::write::h3040a1eb3d8746c9DUp
   2: 0xb60ffc80 - <unknown>
   3: 0xb6493e00 - unwind::begin_unwind_inner::h4b04aff3334f5af9lTd
   4: 0xb5992cf0 - <unknown>
   5: 0xb59936f0 - diagnostic::Handler::bug::h35d70ea01410d57duZC
   6: 0xb6e8ec60 - <unknown>
   7: 0xb6e97ac0 - <unknown>
   8: 0xb6ea0500 - <unknown>
   9: 0xb68a3f60 - <unknown>
  10: 0xb68a3f60 - <unknown>
  11: 0xb68a3f60 - <unknown>
  12: 0xb6ea23a0 - metadata::encoder::EncodeVisitor<'a, 'b>.visit..Visitor<(*>::visit_item::h06ca236bacc1bfab0Dn
  13: 0xb6ea1dd0 - <unknown>
  14: 0xb6ea1100 - <unknown>
  15: 0xb6ea2ae0 - <unknown>
  16: 0xb6ea1100 - <unknown>
  17: 0xb6ea1dd0 - <unknown>
  18: 0xb6ea2bc0 - <unknown>
  19: 0xb6ea23a0 - metadata::encoder::EncodeVisitor<'a, 'b>.visit..Visitor<(*>::visit_item::h06ca236bacc1bfab0Dn
  20: 0xb6ea7320 - <unknown>
  21: 0xb6aab940 - metadata::encoder::encode_metadata::hb175f11a376ff96aIao
  22: 0xb6aab050 - middle::trans::base::write_metadata::hd85593953b447d47wZc
  23: 0xb6aabd50 - middle::trans::base::trans_crate::hbd0a950de76d8b7cU3c
  24: 0xb6ef0d10 - driver::driver::phase_4_translate_to_llvm::h4055dc084f3750d27eu
  25: 0xb6ee7860 - driver::driver::compile_input::h2df17e4f5ce48cc2NRt
  26: 0xb6f90330 - <unknown>
  27: 0xb6f90230 - <unknown>
  28: 0xb6fa2c30 - <unknown>
  29: 0xb6fa2a10 - <unknown>
  30: 0xb77528b0 - <unknown>
  31: 0xb6493800 - <unknown>
  32: 0xb64f1ab0 - rust_try
  33: 0xb6491040 - unwind::try::h05ac48a0b667539bqHd
  34: 0xb6490dd0 - task::Task::run::had6d6b44a110950bgSc
  35: 0xb77526b0 - <unknown>
  36: 0xb6492e00 - <unknown>
  37: 0xb5fa1ea0 - start_thread
  38: 0xb638a702 - clone
  39:        0x0 - <unknown>