[rust-dev] Calling back into Rust from C code

[Skirmantas Kligys]

I am trying to write a native wrapper for

https://github.com/pascalj/rust-expat

(BTW, if there is a native Rust XML parser, I am interested to hear
about it, did not find it).  I have trouble calling back into Rust
from C code:

fn set_element_handlers(parser: expat::XML_Parser, start_handler:
&fn(tag: &str, attrs: &[@str]), end_handler: &fn(tag: &str)) {
  let start_cb = |_user_data: *c_void, c_name: *c_char, _c_attrs: **c_char| {
    unsafe {
      let name = str::raw::from_c_str(c_name);
      start_handler(name, []);
    }
  };

  let end_cb = |_user_data: *c_void, c_name: *c_char| {
    unsafe {
      let name = str::raw::from_c_str(c_name);
      end_handler(name);
    }
  };

  expat::XML_SetElementHandler(parser, start_cb, end_cb);
}

This says that it saw &fn... instead of expected extern fn for the
second and third parameter.  Any ideas how to do this?

Thanks.
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