Add test cases: one xfailed, one not

src/test/auxiliary/issue_3882.rc

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+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[link(name = "linenoise",
+       vers = "0.1")];
+#[crate_type = "lib"];
+
+pub mod issue_3882;

src/test/auxiliary/issue_3882.rs

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+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+mod issue_3882 {
+    struct Completions {
+        mut len: libc::size_t,
+    }
+    
+    extern mod c {
+        fn linenoiseAddCompletion(lc: *Completions);
+    }
+}

src/test/run-pass/issue-3904.rs

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+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// xfail-test
+type ErrPrinter = &fn(&str, &str);
+
+fn example_err(prog: &str, arg: &str) {
+    io::println(fmt!("%s: %s", prog, arg))
+}
+
+fn exit(+print: ErrPrinter, prog: &str, arg: &str) {
+    print(prog, arg);
+}
+
+struct X {
+    mut err: ErrPrinter
+}
+
+impl X {
+    fn boom() {
+        exit(self.err, "prog", "arg");
+    }
+}
+
+fn main(){
+    let val = &X{
+        err: example_err,
+    };
+    val.boom();
+}

src/test/run-pass/issue_3882.rs

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+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:issue_3882.rc
+extern mod linenoise;
+use linenoise::issue_3882::*;
+
+fn main() {}