thread 'rustc' panicked at 'Box<Any>'

[ldanko]

Hi, I got following message from rustc:

error: internal compiler error: trans_local_var: no datum for local/arg 52 found
(...)
thread 'rustc' panicked at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/beta-dist-rustc-linux/build/src/libsyntax/diagnostic.rs:190

I tried this code:

use std::slice::Iter;
use std::io::{Error, ErrorKind, Result};
use std::vec::*;

fn foo(it : &mut Iter<u8>) -> Result<u8> {
    Ok(*it.next().unwrap())
}

fn bar() -> Result<u8> {

    let data : Vec<u8> = Vec::new();

    if true {
        return Err(Error::new(ErrorKind::NotFound, "msg"));
    }

    let mut it = data.iter();
    foo(&mut it)
}

fn main() {
    bar();
}

Meta

rustc --version --verbose:

rustc 1.0.0-beta (9854143cb 2015-04-02) (built 2015-04-02)
binary: rustc
commit-hash: 9854143cba679834bc4ef932858cd5303f015a0e
commit-date: 2015-04-02
build-date: 2015-04-02
host: x86_64-unknown-linux-gnu
release: 1.0.0-beta

Backtrace:

stack backtrace:
   1:     0x7fb71a0c93c8 - sys::backtrace::write::h179e141147f9ee14IJC
   2:     0x7fb71a0f4770 - panicking::on_panic::h6aa569d33389f0cfsXI
   3:     0x7fb71a02c4a3 - rt::unwind::begin_unwind_inner::h082f07869f4b9731ACI
   4:     0x7fb7173cb04d - rt::unwind::begin_unwind::h13428428822164950735
   5:     0x7fb7173cb7a2 - diagnostic::Handler::bug::h7dec5f2940917255ZsB
   6:     0x7fb717dde82b - session::Session::bug::hc743ab3e9fbf0b0bnYq
   7:     0x7fb719755d78 - trans::expr::trans_local_var::hd7325e6f6b345fc2NMi
   8:     0x7fb71974c591 - trans::expr::trans_def::h2fd28f24ac3b6462rli
   9:     0x7fb719738ce5 - trans::expr::trans_unadjusted::hf93051714e2bb83eTXh
  10:     0x7fb7196f01d4 - trans::expr::trans::hbf5d4a994a92ed5cBlh
  11:     0x7fb71974fbd7 - trans::expr::trans_addr_of::h0dfef189387720cdfij
  12:     0x7fb719738f0f - trans::expr::trans_unadjusted::hf93051714e2bb83eTXh
  13:     0x7fb7196f01d4 - trans::expr::trans::hbf5d4a994a92ed5cBlh
  14:     0x7fb719727b1f - trans::callee::trans_args::he3daf042a35667489Rg
  15:     0x7fb71972e5b4 - trans::callee::trans_call_inner::h3731959168429002038
  16:     0x7fb71973ae13 - trans::expr::trans_rvalue_dps_unadjusted::hddd412622c9b115fmti
  17:     0x7fb7196ee868 - trans::expr::trans_into::h6740c9e159fab14cgfh
  18:     0x7fb7196ef8d2 - trans::controlflow::trans_block::hca8dabb22968b279H6d
  19:     0x7fb7197c65bf - trans::base::trans_closure::h2b9d4a88090cb2c4Qtt
  20:     0x7fb7196d8506 - trans::base::trans_fn::h13eecdaa7f8f7dbfzEt
  21:     0x7fb7196d319f - trans::base::trans_item::hcd09515ced7a23baP2t
  22:     0x7fb7197ceafc - trans::base::trans_crate::hdffc9e3841dc9fb5lZu
  23:     0x7fb71a754bbf - driver::phase_4_translate_to_llvm::hfb4ae79c3a76d704aOa
  24:     0x7fb71a72c60b - driver::compile_input::h7c62c2870ff901f6Qba
  25:     0x7fb71a7e3a25 - run_compiler::hc815b49ce638c28eV4b
  26:     0x7fb71a7e133d - boxed::F.FnBox<A>::call_box::h4290333406520961126
  27:     0x7fb71a7e0879 - rt::unwind::try::try_fn::h13999576404798567721
  28:     0x7fb71a170c68 - rust_try_inner
  29:     0x7fb71a170c55 - rust_try
  30:     0x7fb71a7e0b4b - boxed::F.FnBox<A>::call_box::h14489442628055152240
  31:     0x7fb71a0df781 - sys::thread::create::thread_start::h02b7da32b4d7a4aaExH
  32:     0x7fb713ea86a9 - start_thread
  33:     0x7fb719c96eec - __clone
  34:                0x0 - <unknown>

[bytwise]

This compiles fine on rustc 1.0.0-nightly (1284be404 2015-04-18) (built 2015-04-17)