Compiler crash

[bwindels]

Compiler panics while compiling the following code:

use libc::c_char;
use std::ffi;
use std::str;
use std::vec;

struct TokenCollection {
    parts: Vec<&str>,
    name: &str
}

fn c_str_to_slice(c_str: *mut c_char) -> &str {
    let c_bytes = unsafe { ffi::c_str_to_bytes(&c_str); };
    std::from_utf8(c_bytes).unwrap()
}

impl TokenCollection {
    fn new(str: &str) -> &TokenCollection {
        TokenCollection {
            parts: str.split(|c| c.is_whitespace()).collect()
        }
    }

    fn len(&self) -> usize {
        self.parts.len()
    }
}

// impl Drop for TokenCollection {
//  fn drop(&self) {
//      println!("drop it like it's hot");
//  }
// }

#[no_mangle]
pub extern fn token_collection_create(c_str: *c_char) -> *mut TokenCollection {
    let str = c_str_to_slice(c_str);

    unsafe { transmute(box TokenCollection::new(str)) }
}

#[no_mangle]
pub extern fn token_collection_len(pimpl: *mut TokenCollection) -> libc::uint64_t {
    pimpl.len()
}

#[no_mangle]
pub extern fn token_collection_destroy(pimpl: *mut TokenCollection) {
    let str = c_str_to_slice(c_str);

    unsafe { transmute(box TokenCollection::new(str)) }
}

I expected running the compiler would show the errors it found in the code, which it did, but then it paniced:

Compiler command: rustc foo.rs --crate-type="staticlib" -o foo.a
Compiler output:

foo.rs:35:46: 35:47 error: bare raw pointers are no longer allowed, you should likely use `*mut T`, but otherwise `*T` is now known as `*const T`
foo.rs:35 pub extern fn token_collection_create(c_str: *c_char) -> *mut TokenCollection {
                                                       ^
error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
...

Meta

rustc --version --verbose:

rustc 1.0.0-nightly (91bdf23f5 2015-03-09) (built 2015-03-08)
binary: rustc
commit-hash: 91bdf23f504f79ed59617cde3dfebd3d5e39a476
commit-date: 2015-03-09
build-date: 2015-03-08
host: x86_64-apple-darwin
release: 1.0.0-nightly

Backtrace:

stack backtrace:
   1:        0x1080af27d - sys::backtrace::write::h8bb5f05fb3b15b46KDA
   2:        0x1080d8c34 - panicking::on_panic::h774322e801e90255MsJ
   3:        0x10800a299 - rt::unwind::begin_unwind_inner::h91fe489b48891c2fibJ
   4:        0x10800a71e - rt::unwind::begin_unwind_fmt::h611a8fe214a71d11T9I
   5:        0x1080d870d - rust_begin_unwind
   6:        0x108127815 - panicking::panic_fmt::h28951af8a1739750HZs
   7:        0x108121b07 - panicking::panic::h1f407e1cc2932c40TXs
   8:        0x1047a1667 - driver::build_output_filenames::h2291f05686c39ba461a
   9:        0x1047963a9 - driver::compile_input::h65a0e989415894e2Nba
  10:        0x104864bd6 - run_compiler::h6bbe5e8fdeccf450G6b
  11:        0x1048622c0 - thunk::F.Invoke<A, R>::invoke::h11072616449651537896
  12:        0x104860dff - rt::unwind::try::try_fn::h9635732175488659353
  13:        0x108152ca8 - rust_try_inner
  14:        0x108152c95 - rust_try
  15:        0x10486161f - thunk::F.Invoke<A, R>::invoke::h10357567482835563298
  16:        0x1080c43f2 - sys::thread::thread_start::h214ccfe780c3e0cb32E
  17:     0x7fff88da5898 - _pthread_body
  18:     0x7fff88da5729 - _pthread_start

[frewsxcv]

I think this was fixed in #23210

You can get around this by doing rustc foo.rs --crate-type="staticlib" -o ./foo.a

[bwindels]

Thanks, that fixed it.