ICE: unexpected definition: PrimTy(TyStr)

[mzji]

Code:

#![feature(unicode)]

pub trait ToUtf16 {
    fn to_vec_u16(&self) -> Vec<u16>;
}

impl ToUtf16 for str {
    fn to_vec_u16(&self) -> Vec<u16> {
        let mut ret_val = vec![];
        str.chars().inspect(|ch| {
            let mut temp = [0u16; 2];
            ret_val.extend_from_slice(ch.encode_utf16(&mut temp));
        }).count();
        ret_val.push(0);
        ret_val
    }
}

fn main() {

}

Console output:

Running "cargo build":
   Compiling compiler_confirm v0.1.0 (file:///C:/Users/MYUSERNAME/Documents/Rust/compiler_confirm)
error: internal compiler error: ../src/librustc_typeck\check/mod.rs:4396: unexpected definition: PrimTy(TyStr)

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: run with `RUST_BACKTRACE=1` for a backtrace

thread 'rustc' panicked at 'Box<Any>', ../src/librustc_errors/lib.rs:423
stack backtrace:
   0:     0x7ffa9068035a - std::panicking::Location::line::h9363ce800e842170
   1:     0x7ffa9067f7e4 - std::panicking::Location::line::h9363ce800e842170
   2:     0x7ffa9068323d - std::panicking::rust_panic_with_hook::hc790e47d4ecc86cd
   3:     0x7ffa90302670 - <unknown>
   4:     0x7ffa9031b09e - rustc_errors::Handler::bug::h620f7270292f0095
   5:     0x7ffa8e4c5655 - rustc::session::bug_fmt::he2d2f00a4afa9d1e
   6:     0x7ffa8e4c548a - rustc::session::bug_fmt::he2d2f00a4afa9d1e
   7:     0x7ffa8e4c4bfc - rustc::session::bug_fmt::he2d2f00a4afa9d1e
   8:     0x7ffa8eae9f8a - rustc_typeck::check::FnCtxt::instantiate_value_path::h4229ac945aebfa55
   9:     0x7ffa8ead45c6 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  10:     0x7ffa8ead2ff1 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  11:     0x7ffa8ead3a14 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  12:     0x7ffa8ead2ff1 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  13:     0x7ffa8ead3a14 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  14:     0x7ffa8ead2ff1 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  15:     0x7ffa8ead3a14 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  16:     0x7ffa8ead2ff1 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  17:     0x7ffa8eae836b - rustc_typeck::check::FnCtxt::check_stmt::h155d968e61fdfae6
  18:     0x7ffa8eae872e - rustc_typeck::check::FnCtxt::check_block_no_value::h3ac235dc3eaa76c3
  19:     0x7ffa8ead34de - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  20:     0x7ffa8ead2ff1 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
  21:     0x7ffa8eab2e8d - <rustc_typeck::check::GatherLocalsVisitor<'a, 'gcx, 'tcx> as rustc::hir::intravisit::Visitor<'gcx>>::visit_ty::hdcba5921c886305a
  22:     0x7ffa8eab11c7 - rustc_typeck::check::check_drop_impls::hb6e6926f4342f9e2
  23:     0x7ffa8eab5506 - rustc_typeck::check::check_item_body::h1e039ede2f960fb9
  24:     0x7ffa8eaade2d - rustc_typeck::check::check_item_bodies::hd22adb7703cc56d7
  25:     0x7ffa8eb37c60 - rustc_typeck::check_crate::h92f6bdfe03b6afba
  26:     0x7ffa9094c10e - rustc_driver::driver::count_nodes::h84f03318ea2320a8
  27:     0x7ffa908a577f - <unknown>
  28:     0x7ffa90928172 - rustc_driver::driver::compile_input::h8e119234b60571d5
  29:     0x7ffa90979527 - rustc_driver::run_compiler::h57c4f233cd1a0c04
  30:     0x7ffa9085d7de - <unknown>
  31:     0x7ffa90685c01 - _rust_maybe_catch_panic
  32:     0x7ffa90887344 - <unknown>
  33:     0x7ffa9067d8ae - std::sys::imp::thread::Thread::new::hd990f5dcc0d4bad9
  34:     0x7ffac1388363 - BaseThreadInitThunk

error: Could not compile `compiler_confirm`.

To learn more, run the command again with --verbose.

"cargo build" completed with code 101
It took approximately 0.895 seconds

rustc info:

rustc 1.15.0-nightly (c80c31a50 2016-12-02)
binary: rustc
commit-hash: c80c31a502c838f9ec06f1003d7c61cf9de9d551
commit-date: 2016-12-02
host: x86_64-pc-windows-msvc
release: 1.15.0-nightly
LLVM version: 3.9

[petrochenkov]

This is exactly the same issue as #38155

[mzji]

Ok, then it's a duplicate. Closed.