Float::fract breaks the compiler

[nwoeanhinnogaehr]

Code to reproduce the bug:

fn main() {
    Float::fract(0.5f32);
}

Compiler output:

   Compiling bug v0.0.1 (file:///home/trypt/tmp/bug)
     Running `rustc /home/trypt/tmp/bug/src/main.rs --crate-name bug --crate-type bin -g --out-dir /home/trypt/tmp/bug/target --dep-info /home/trypt/tmp/bug/target/.fingerprint/bug-67113fbff5bc7356/dep-bin-bug -L /home/trypt/tmp/bug/target -L /home/trypt/tmp/bug/target/deps`
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://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'assertion failed: `(left == right) && (right == left)` (left: `3`, right: `0`)', /build/rust-git/src/rust/src/librustc/middle/trans/callee.rs:528

stack backtrace:
   1:     0x7fd17b05c470 - rt::backtrace::imp::write::h0cc7f5a851746c38Ocq
   2:     0x7fd17b05f600 - <unknown>
   3:     0x7fd17f3e3180 - unwind::begin_unwind_inner::h5b81075b29d74844Axd
   4:     0x7fd17f3e2cc0 - unwind::begin_unwind_fmt::hd260f19c1920c5a32ud
   5:     0x7fd17fd93740 - middle::trans::callee::trans_fn_ref_with_substs::h5deeb486f0f6dab4Lo3
   6:     0x7fd17fd92290 - middle::trans::callee::trans_fn_ref::hacac6cfbed594251Bc3
   7:     0x7fd17fd99210 - <unknown>
   8:     0x7fd17fd76b20 - middle::trans::callee::trans_call_inner::h502f1bd96a59fd28vK3
   9:     0x7fd17fd98f60 - middle::trans::callee::trans_call::hf40be968c141ae5bPE3
  10:     0x7fd17fda54e0 - <unknown>
  11:     0x7fd17fd70e20 - middle::trans::expr::trans_into::h3b4c19303fb11879Gu4
  12:     0x7fd17fd70620 - middle::trans::controlflow::trans_stmt_semi::h0157dff82bfa6cac3J0
  13:     0x7fd17fd6fe00 - middle::trans::controlflow::trans_stmt::h497be90c0662b04dQF0
  14:     0x7fd17fd71120 - middle::trans::controlflow::trans_block::hd34eb13f50ea62f1WK0
  15:     0x7fd17fe08910 - middle::trans::base::trans_closure::h2fb21c88239bbfe10Qg
  16:     0x7fd17fd66a70 - middle::trans::base::trans_fn::h91ab64c979d92e01o2g
  17:     0x7fd17fd645e0 - middle::trans::base::trans_item::h0bbbc3d81b428522Hlh
  18:     0x7fd17fe128e0 - middle::trans::base::trans_crate::h8dcabfd4506b3a0cyji
  19:     0x7fd180217570 - driver::driver::phase_4_translate_to_llvm::ha21de371a2b99cd1XjA
  20:     0x7fd18020edd0 - driver::driver::compile_input::hab7fcf1cca4d496cRQz
  21:     0x7fd18029a640 - <unknown>
  22:     0x7fd18029a4f0 - <unknown>
  23:     0x7fd17fa3eba0 - <unknown>
  24:     0x7fd17fa3e980 - <unknown>
  25:     0x7fd17f726280 - <unknown>
  26:     0x7fd17f434ad0 - <unknown>
  27:     0x7fd17f434ac0 - rust_try
  28:     0x7fd17f3e0a40 - unwind::try::hb052988446d45dc3imd
  29:     0x7fd17f3e08c0 - task::Task::run::h28d352999c4a334eWBc
  30:     0x7fd17f725fc0 - <unknown>
  31:     0x7fd17f3e2190 - <unknown>
  32:     0x7fd17a409250 - start_thread
  33:     0x7fd17f0bc3b9 - clone
  34:                0x0 - <unknown>

Could not compile `bug`.

Caused by:
  Process didn't exit successfully: `rustc /home/trypt/tmp/bug/src/main.rs --crate-name bug --crate-type bin -g --out-dir /home/trypt/tmp/bug/target --dep-info /home/trypt/tmp/bug/target/.fingerprint/bug-67113fbff5bc7356/dep-bin-bug -L /home/trypt/tmp/bug/target -L /home/trypt/tmp/bug/target/deps` (status=101)

I'm running rustc 0.13.0-dev (2130f2221 2014-10-21 19:32:10 +0000) on 64bit Arch Linux.

[alexcrichton]

cc @nick29581

[nrc]

dup of #18061

(you should use 0.5f32.fract() for now)