Internal compiler error for windows OsStrExt

[novacrazy]

The code that produces the internal compiler error

//main.rs

use std::os::windows::ffi::OsStrExt;
use std::ffi::OsStr;

pub fn to_wstring(s: &str) -> Vec<u16> {
    OsStr::new(str).encode_wide().chain(Some(0).into_iter()).collect()
}

fn main() {}

pub on to_wstring doesn't make a difference, nor does removing the chain part.

Here is the error:

E:\code\projects\2016\test-case>cargo build
   Compiling test-case v0.1.0 (file:///E:/code/projects/2016/test-case)
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

thread 'rustc' panicked at 'Box<Any>', ../src/librustc_errors/lib.rs:423
note: Run with `RUST_BACKTRACE=1` for a backtrace.

error: Could not compile `test-case`.

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

Meta

Rust version:

rustc 1.15.0-nightly (daf8c1dfc 2016-12-05)
binary: rustc
commit-hash: daf8c1dfce3b448fc581cc319f64632ec22bd0e1
commit-date: 2016-12-05
host: x86_64-pc-windows-msvc
release: 1.15.0-nightly
LLVM version: 3.9

And here is the backtrace:

0:     0x7ff9fc2802ea - std::panicking::Location::line::h9363ce800e842170
1:     0x7ff9fc27f774 - std::panicking::Location::line::h9363ce800e842170
2:     0x7ff9fc2831cd - std::panicking::rust_panic_with_hook::hc790e47d4ecc86cd
3:     0x7ffa209f2670 - <unknown>
4:     0x7ffa20a0b09e - rustc_errors::Handler::bug::h620f7270292f0095
5:     0x7ff9f49c5e25 - rustc::session::bug_fmt::he2d2f00a4afa9d1e
6:     0x7ff9f49c5c5a - rustc::session::bug_fmt::he2d2f00a4afa9d1e
7:     0x7ff9f49c53cc - rustc::session::bug_fmt::he2d2f00a4afa9d1e
8:     0x7ff9fa349d1a - rustc_typeck::check::FnCtxt::instantiate_value_path::h4229ac945aebfa55
9:     0x7ff9fa334356 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
10:     0x7ff9fa332d81 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
11:     0x7ff9fa3260ce - rustc_typeck::check::FnCtxt::field_ty::h3fce8b0238020251
12:     0x7ff9fa2f6ce7 - rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx>>::check_call::h762a25d0c9a1f5b4
13:     0x7ff9fa2f5cd3 - rustc_typeck::check::callee::<impl rustc_typeck::check::FnCtxt<'a, 'gcx, 'tcx>>::check_call::h762a25d0c9a1f5b4
14:     0x7ff9fa3340fd - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
15:     0x7ff9fa332d81 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
16:     0x7ff9fa3337a4 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
17:     0x7ff9fa332d81 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
18:     0x7ff9fa3337a4 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
19:     0x7ff9fa332d81 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
20:     0x7ff9fa3337a4 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
21:     0x7ff9fa332d81 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
22:     0x7ff9fa3484f3 - rustc_typeck::check::FnCtxt::check_block_no_value::h3ac235dc3eaa76c3
23:     0x7ff9fa33326e - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
24:     0x7ff9fa332d81 - rustc_typeck::check::FnCtxt::check_struct_path::h1ff2872963f8985c
25:     0x7ff9fa312c1d - <rustc_typeck::coherence::orphan::OrphanChecker<'cx, 'tcx> as rustc::hir::itemlikevisit::ItemLikeVisitor<'v>>::visit_impl_item::habbc901b4cfa4531
26:     0x7ff9fa310f57 - rustc_typeck::check::check_drop_impls::hb6e6926f4342f9e2
27:     0x7ff9fa3152e1 - rustc_typeck::check::check_item_body::h1e039ede2f960fb9
28:     0x7ff9fa30dbbd - rustc_typeck::check::check_item_bodies::hd22adb7703cc56d7
29:     0x7ff9fa39a500 - rustc_typeck::check_crate::h92f6bdfe03b6afba
30:     0x7ff9fe24c98e - rustc_driver::driver::count_nodes::h84f03318ea2320a8
31:     0x7ff9fe1a5bcf - <unknown>
32:     0x7ff9fe228932 - rustc_driver::driver::compile_input::h8e119234b60571d5
33:     0x7ff9fe279f27 - rustc_driver::run_compiler::h57c4f233cd1a0c04
34:     0x7ff9fe15da1e - <unknown>
35:     0x7ff9fc285bf1 - _rust_maybe_catch_panic
36:     0x7ff9fe187794 - <unknown>
37:     0x7ff9fc27d86e - std::sys::imp::thread::Thread::new::hd990f5dcc0d4bad9
38:     0x7ffa3d3e8363 - BaseThreadInitThunk

[durka]

This is a(nother) duplicate of #38155, which will be fixed whenever we manage to produce a new nightly (don't hold your breath). It's astounding how many people hit this regression. Maybe we need to add something about searching existing issues to the ICE message.

[novacrazy]

Is there a buildable commit with a fix that I could compile locally?

[novacrazy]

I'll try 7ad7232 and/or master

[nagisa]

Your code is wrong. No need to search for new compilers.

    OsStr::new(str).encode_wide().chain(Some(0).into_iter()).collect() // wrong
    OsStr::new(s).encode_wide().chain(Some(0).into_iter()).collect()   // good

[novacrazy]

Ah, I didn't notice my typo.

Still, an internal compiler error probably isn't the best error for something like that.

[sanxiyn]

Closing as a duplicate.