casting enum to itself results in an ICE

[whitequark]

Excerpt:

#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[repr(i32)]
pub enum Flicker {
    AC_60Hz         = 0,
    AC_50Hz         = 1,
    DC              = 2,
}
extern {
    fn Toupcam_get_HZ(h: *mut Handle, nHZ: *mut Flicker) -> HRESULT;
}
struct Handle;
struct Toupcam { handle: *mut Handle };
impl Toupcam {
    pub fn flicker_compensation(self: &mut Toupcam) -> Flicker {
        unsafe {
            let mut hz: Flicker = std::mem::zeroed();
            accept(Toupcam_get_HZ(self.handle, &mut hz));
            hz as Flicker
            // hz ← this works
        }
    }
}

rustc:

rustc 1.1.0-nightly (c033d9828 2015-05-09) (built 2015-05-09)

Backtrace:

thread 'rustc' panicked at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libsyntax/diagnostic.rs:230

stack backtrace:
   1:     0x7f95e0cee149 - sys::backtrace::write::hf630cda5c057d925shs
   2:     0x7f95e0cf60c9 - panicking::on_panic::h3cbeeb6d9cf9a057vXw
   3:     0x7f95e0cb62a2 - rt::unwind::begin_unwind_inner::ha89a41e3e4923fa0FCw
   4:     0x7f95de093c6d - rt::unwind::begin_unwind::h7315671891021698504
   5:     0x7f95de09432b - diagnostic::Handler::bug::h1cc046814848dce7f8B
   6:     0x7f95dec8e60b - session::Session::bug::hfdd24549514c30bfUOq
   7:     0x7f95dfb8bf4b - trans::expr::trans_imm_cast::hf676a2bafa8a3d58OpC
   8:     0x7f95dfb80807 - trans::expr::trans_unadjusted::haa8fe9f5b3216facvCA
   9:     0x7f95dfb553ed - trans::expr::trans_into::h5aace87d45cda18fl9z
  10:     0x7f95dfad92e6 - trans::controlflow::trans_block::h83622bcb20d2285cw3u
  11:     0x7f95dfb8179b - trans::expr::trans_rvalue_dps_unadjusted::h3e4f1c626cf22366Y7A
  12:     0x7f95dfb553cc - trans::expr::trans_into::h5aace87d45cda18fl9z
  13:     0x7f95dfad92e6 - trans::controlflow::trans_block::h83622bcb20d2285cw3u
  14:     0x7f95dfad7bb6 - trans::base::trans_closure::h1623429c4a8ffbebjHh
  15:     0x7f95dfad98da - trans::base::trans_fn::hc7a5cef88d3731c91Rh
  16:     0x7f95dfadd6b2 - trans::base::trans_item::h1a43519c5bd06690dgi
  17:     0x7f95dfaead07 - trans::base::trans_crate::hadadeed95ebf196004i
  18:     0x7f95e1245d6a - driver::phase_4_translate_to_llvm::h7a1973fec1c0688cnOa
  19:     0x7f95e121e136 - driver::compile_input::h020e6002d10336a4Qba
  20:     0x7f95e12d7d61 - run_compiler::he8fc8a587311be2465b
  21:     0x7f95e12d55b2 - boxed::F.FnBox<A>::call_box::h13553308903082253150
  22:     0x7f95e12d4b79 - rt::unwind::try::try_fn::h3807368746205497482
  23:     0x7f95e0d69068 - rust_try_inner
  24:     0x7f95e0d69055 - rust_try
  25:     0x7f95e12d4e14 - boxed::F.FnBox<A>::call_box::h15011448770904444204
  26:     0x7f95e0cf4e61 - sys::thread::Thread::new::thread_start::h8bc03e8ed99cab4d1Iv
  27:     0x7f95dad8f0a3 - start_thread
  28:     0x7f95e094104c - clone
  29:                0x0 - <unknown>

[mitaa]

This should compile on the nightly channel - can you confirm that?
( -> #25143 which was presumably fixed by #24333 )

[whitequark]

Yeah.