this

?

fn readZip(fname: str) -> io::reader unsafe {
  let mode= "r";
  let fptr = str::as_c_str(fname) {|f| str::as_c_str(mode) { |m| libc::popen(f, m) }; }; 
  io::FILE_reader(fptr, true);
}

fn main() {
  let rd = readZip("unzip -p \*.zip");
}

///////////

import.rs:9:34: 9:87 error: in function anon, not all control paths return a value
import.rs:9   let fptr = str::as_c_str(fname) {|f| str::as_c_str(mode) { |m| libc::popen(f, m) }; }; 
                                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: internal compiler error unexpected failure
note: The compiler hit an unexpected failure path. This is a bug. Try running with RUST_LOG=rustc=0,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues

import.rs:7:37: 11:1 error: in function readZip, not all control paths return a value
import.rs:7 fn readZip(fname: str) -> io::reader unsafe {
import.rs:8 let mode= "r";
import.rs:9 let fptr = str::as_c_str(fname) {|f| str::as_c_str(mode) { |m| libc::popen(f, m) } };
import.rs:10 io::FILE_reader(fptr, true);
import.rs:11 }
import.rs:7:26: 7:36 error: see declared return type of 'io::reader'
import.rs:7 fn readZip(fname: str) -> io::reader unsafe {
^~~~~~~~~~