'rustc' panicked at 'assertion failed: f.abi == Rust || f.abi == RustCall'

[abhijeetbhagat]

I am doing FFI and this is what i wrote:

pub struct Cursor{
    conn : Connection,
    stmt : *mut sqlite3_stmt,
    pzTail :*const c_char
}
impl Cursor{
 extern fn foo(){}
}

Error:

error: internal compiler error: unexpected panic
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' panicked at 'assertion failed: f.abi == Rust || f.abi == RustCall', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/librustc/middle/trans/base.rs:2354

$ rustc --version=verbose
rustc 0.13.0-nightly
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-unknown-linux-gnu
release: 0.13.0-nightly

[nodakai]

Minimized down to

struct S;

impl S {
    extern fn f() { }
}

fn main() {
}

• http://is.gd/lW8bG8

Interesting... The panic message seems to say that the "C" ABI (extern defaluts to "C") should have been rejected at an earlier stage of compilation.

Btw, my understanding is that all you can export by Rust FFI are limited to C function calls. I don't think you can export OOP-style method calls such as obj.method() to C++.

[nodakai]

#19138 is the same.

[frewsxcv]

Just tried compiling @nodakai's minimized code above and can confirm that this is still resulting in an ICE.

~ $ rustc -Vv
rustc 1.0.0-nightly (b9ba643b7 2015-02-13 21:15:39 +0000)
binary: rustc
commit-hash: b9ba643b72ea6104bcb1209d238f6b445e3b51fc
commit-date: 2015-02-13 21:15:39 +0000
host: x86_64-apple-darwin
release: 1.0.0-nightly