Regression in typeck from beta to nightly

[raggy-rs]

Works on stable and beta but not on nigthly

I tried this code in the playground:

struct X {
    a: [usize;26],
}
impl X {
    pub fn foo()->Self{
        let a = [usize;5];
        X{a:a}
    }
}

I expected to get:

error[E0425]: unresolved name `usize`

Instead, this happened:

error: internal compiler error: ../src/librustc_typeck/check/mod.rs:4396: unexpected definition: PrimTy(TyUint(usize))

Meta

rustc 1.15.0-nightly (daf8c1dfc 2016-12-05)

Backtrace:
  15:      0x7fec6098187 - rustc_typeck::check::FnCtxt::check_stmt::h155d968e61fdfae6
  16:      0x7fec60984be - rustc_typeck::check::FnCtxt::check_block_no_value::h3ac235dc3eaa76c3
  17:      0x7fec608326e - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  18:      0x7fec6082d81 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  19:      0x7fec6062c1d - <rustc_typeck::coherence::orphan::OrphanChecker<'cx, 'tcx> as rustc::hir::itemlikevisit::ItemLikeVisitor<'v>>::visit_im
pl_item::habbc901b4cfa4531
  20:      0x7fec6060f57 - rustc_typeck::check::check_drop_impls::hb6e6926f4342f9e2
  21:      0x7fec6065296 - rustc_typeck::check::check_item_body::h1e039ede2f960fb9
  22:      0x7fec605dbbd - rustc_typeck::check::check_item_bodies::hd22adb7703cc56d7
  23:      0x7fec60ea500 - rustc_typeck::check_crate::h92f6bdfe03b6afba
  24:      0x7fecec9c98e - rustc_driver::driver::count_nodes::h84f03318ea2320a8
  25:      0x7fecebf5bcf - <unknown>
  26:      0x7fecec78932 - rustc_driver::driver::compile_input::h8e119234b60571d5
  27:      0x7fececc9f27 - rustc_driver::run_compiler::h57c4f233cd1a0c04
  28:      0x7fecebada1e - <unknown>
  29:      0x7fec8f85bf1 - _rust_maybe_catch_panic
  30:      0x7fecebd7794 - <unknown>
  31:      0x7fec8f7d86e - std::sys::imp::thread::Thread::new::hd990f5dcc0d4bad9
  32:         0x76f059cc - BaseThreadInitThunk

[petrochenkov]

Duplicate of #38155, fixed in #38154

[steveklabnik]

Closing as a duplicate, thanks!