Failing patch for Rust #12378

gistfile1.diff

diff --git a/src/librustc/middle/trans/controlflow.rs b/src/librustc/middle/tran
index ad575eb..8875283 100644
--- a/src/librustc/middle/trans/controlflow.rs
+++ b/src/librustc/middle/trans/controlflow.rs
@@ -14,6 +14,7 @@ use middle::trans::base::*;
 use middle::trans::build::*;
 use middle::trans::callee;
 use middle::trans::common::*;
+use middle::trans::datum::{Datum, Lvalue, Rvalue, ByValue};
 use middle::trans::debuginfo;
 use middle::trans::cleanup;
 use middle::trans::cleanup::CleanupMethods;
@@ -400,7 +401,15 @@ pub fn trans_fail_bounds_check<'a>(
                                len: ValueRef)
                                -> &'a Block<'a> {
     let _icx = push_ctxt("trans_fail_bounds_check");
-    let (filename, line) = filename_and_line_num_from_span(bcx, sp);
+    let loc  = bcx.sess().parse_sess.cm.lookup_char_pos(sp.lo);
+
+    let line     = Datum(C_int(bcx.ccx(), loc.line as int),
+                    ty::mk_uint(), Rvalue(ByValue)).to_appropriate_datum(bcx);
+    let filename = Datum(C_str_slice(bcx.ccx(),
+                            token::intern_and_get_ident(loc.file.name)),
+                        ty::mk_str(bcx.tcx(), ty::vstore_slice(ty::ReStatic)),
+                        Rvalue(ByValue)).to_appropriate_datum(bcx);
+
     let args = ~[filename, line, index, len];
     let did = langcall(bcx, Some(sp), "", FailBoundsCheckFnLangItem);
     let bcx = callee::trans_lang_call(bcx, did, args, Some(expr::Ignore)).bcx;