index out of bounds: the len is 0 but the index is 0 (overloaded_calls + generics ?)

[Majavar]

The following code generates an ICE:

#![feature(overloaded_calls)]

use std::num::Float;
use std::ops::Fn;

pub struct S<T>;

impl<T: Float> Fn<(T,), T> for S<T> {
    fn call(&self, (t,): (T,)) -> T {
        t + t
    }
}

pub fn main() -> () {
    println!("{}", S(0.0))
}

Here is the backtrace:

$ RUST_BACKTRACE=1 rustc ./main.rs
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 'index out of bounds: the len is 0 but the index is 0', /rust/src/librustc/lib.rs:1

stack backtrace:
   1:     0x7f61d152a750 - rt::backtrace::imp::write::hbf594bfcbd976c5fKGp::v0.11.0.pre
   2:     0x7f61d1531e80 - failure::on_fail::h6739855b3b361e06Z1p::v0.11.0.pre
   3:     0x7f61d1cfb620 - unwind::begin_unwind_inner::h864a3681c67107aaQRd::v0.11.0.pre
   4:     0x7f61d1cfb0b0 - unwind::begin_unwind_fmt::hd3ad2f53733e11c5jPd::v0.11.0.pre
   5:     0x7f61d1cfb070 - rust_begin_unwind
   6:     0x7f61d1d440c0 - failure::begin_unwind::h6f9ec3a7f2e1757dk2v::v0.11.0.pre
   7:     0x7f61d1d47eb0 - failure::fail_bounds_check::h6fe47fa176892fd2w0v::v0.11.0.pre
   8:     0x7f61d23feb00 - middle::trans::common::find_vtable::hbe052284cb335e25R7i::v0.11.0.pre
   9:     0x7f61d23cbfd0 - middle::trans::meth::trans_method_callee::h58fa59227ba3a74fKrw::v0.11.0.pre
  10:     0x7f61d23f4590 - middle::trans::expr::trans_overloaded_op::closure.63613
  11:     0x7f61d23ca150 - middle::trans::callee::trans_call_inner::hbd8c565da23a49abWTe::v0.11.0.pre
  12:     0x7f61d23ed5d0 - middle::trans::expr::trans_overloaded_op::h1c6e729ace8ee326gxh::v0.11.0.pre
  13:     0x7f61d23d5540 - middle::trans::expr::trans_rvalue_dps_unadjusted::h207b9e37238436aaTmg::v0.11.0.pre
  14:     0x7f61d2392e00 - middle::trans::expr::trans_into::hb921ddb303092b34Nvf::v0.11.0.pre
  15:     0x7f61d23933a0 - middle::trans::controlflow::trans_block::hcea995d6d8ecc6462ic::v0.11.0.pre
  16:     0x7f61d24579c0 - middle::trans::base::trans_closure::h3afd19bf5d2e4f00Bkq::v0.11.0.pre
  17:     0x7f61d2361fc0 - middle::trans::base::trans_fn::h6fadcbab5d002eb2Csq::v0.11.0.pre
  18:     0x7f61d2362bc0 - middle::trans::monomorphize::monomorphic_fn::h4825ebffa29fec37kGb::v0.11.0.pre
  19:     0x7f61d23bedb0 - middle::trans::callee::trans_fn_ref_with_vtables::hc015559cb0b0e1832ve::v0.11.0.pre
  20:     0x7f61d23ba1d0 - middle::trans::callee::trans_fn_ref::h0c9b3835ccc04010pqe::v0.11.0.pre
  21:     0x7f61d23cbfd0 - middle::trans::meth::trans_method_callee::h58fa59227ba3a74fKrw::v0.11.0.pre
  22:     0x7f61d23f46b0 - middle::trans::expr::trans_overloaded_call::closure.63627
  23:     0x7f61d23ca150 - middle::trans::callee::trans_call_inner::hbd8c565da23a49abWTe::v0.11.0.pre
  24:     0x7f61d23d5540 - middle::trans::expr::trans_rvalue_dps_unadjusted::h207b9e37238436aaTmg::v0.11.0.pre
  25:     0x7f61d23d46e0 - middle::trans::expr::trans_unadjusted::h1aed4cecf279ea75NSf::v0.11.0.pre
  26:     0x7f61d2395080 - middle::trans::expr::trans::h67b57614b1975c03Izf::v0.11.0.pre
  27:     0x7f61d2392ca0 - middle::trans::expr::trans_to_lvalue::h60cae01626f0c74eQRf::v0.11.0.pre
  28:     0x7f61d23e2770 - middle::trans::expr::trans_addr_of::hffce5114dcb238e3jeh::v0.11.0.pre
  29:     0x7f61d23d46e0 - middle::trans::expr::trans_unadjusted::h1aed4cecf279ea75NSf::v0.11.0.pre
  30:     0x7f61d2392e00 - middle::trans::expr::trans_into::hb921ddb303092b34Nvf::v0.11.0.pre
  31:     0x7f61d23eb1b0 - middle::trans::expr::trans_adt::hc13c96bd7a794dfcSXg::v0.11.0.pre
  32:     0x7f61d23d5540 - middle::trans::expr::trans_rvalue_dps_unadjusted::h207b9e37238436aaTmg::v0.11.0.pre
  33:     0x7f61d23d46e0 - middle::trans::expr::trans_unadjusted::h1aed4cecf279ea75NSf::v0.11.0.pre
  34:     0x7f61d2395080 - middle::trans::expr::trans::h67b57614b1975c03Izf::v0.11.0.pre
  35:     0x7f61d2392ca0 - middle::trans::expr::trans_to_lvalue::h60cae01626f0c74eQRf::v0.11.0.pre
  36:     0x7f61d23e91c0 - middle::trans::_match::trans_match::h3af1523d93f128c4Flu::v0.11.0.pre
  37:     0x7f61d23d5540 - middle::trans::expr::trans_rvalue_dps_unadjusted::h207b9e37238436aaTmg::v0.11.0.pre
  38:     0x7f61d2392e00 - middle::trans::expr::trans_into::hb921ddb303092b34Nvf::v0.11.0.pre
  39:     0x7f61d23933a0 - middle::trans::controlflow::trans_block::hcea995d6d8ecc6462ic::v0.11.0.pre
  40:     0x7f61d24579c0 - middle::trans::base::trans_closure::h3afd19bf5d2e4f00Bkq::v0.11.0.pre
  41:     0x7f61d2361fc0 - middle::trans::base::trans_fn::h6fadcbab5d002eb2Csq::v0.11.0.pre
  42:     0x7f61d235a9d0 - middle::trans::base::trans_item::h77d5111e85e2fe471Iq::v0.11.0.pre
  43:     0x7f61d2468ca0 - middle::trans::base::trans_crate::h2241c8ee71ebb180yCr::v0.11.0.pre
  44:     0x7f61d2c99d40 - driver::driver::phase_4_translate_to_llvm::h8b6e7a93a6991bed3Wv::v0.11.0.pre
  45:     0x7f61d2c8e080 - driver::driver::compile_input::h6676b0f936d4595a7Bv::v0.11.0.pre
  46:     0x7f61d2d5c690 - driver::run_compiler::h64d024e3859b33d4Jly::v0.11.0.pre
  47:     0x7f61d2d5c5a0 - driver::main_args::closure.99065
  48:     0x7f61d2d71ff0 - task::TaskBuilder<S>::try_future::closure.100143
  49:     0x7f61d2d71c10 - task::TaskBuilder<S>::spawn_internal::closure.100126
  50:     0x7f61d4cfa840 - task::spawn_opts::closure.7265
  51:     0x7f61d1cf81f0 - task::Task::run::closure.5343
  52:     0x7f61d1d5d940 - rust_try
  53:     0x7f61d1cfac40 - unwind::try::h2fd6a632e046fdd3fGd::v0.11.0.pre
  54:     0x7f61d1cf8070 - task::Task::run::h71b51f0ef0858bf9VVc::v0.11.0.pre
  55:     0x7f61d4cfa5e0 - task::spawn_opts::closure.7238
  56:     0x7f61d1cfa200 - thread::thread_start::h4693ff282bb7590akdd::v0.11.0.pre
  57:     0x7f61d0f9dc20 - start_thread
  58:     0x7f61d19b7a89 - clone
  59:                0x0 - <unknown>

$ rustc -v
rustc 0.11.0-pre (311890c 2014-06-20 11:01:33 +0000)
host: x86_64-unknown-linux-gnu

There is no ICE if the function returns t instead of t + t
There is no ICE if I don't use a generic structure (I tried with f64 instead of T)
There is no ICE if I don't use the trait Fn and deactivate the feature overloaded_calls (same function but in impl<T: Float> S<T>)

[alexcrichton]

Closing as a dupe of #13655 (using the Fn trait as well)