Adding a test case for #2548

Author: eholk

src/test/run-pass/issue-2548.rs

@@ -0,0 +1,27 @@
+// A test case for #2548.
+
+// xfail-test
+
+struct foo {
+    x: @mut int;
+
+    new(x: @mut int) { self.x = x; }
+
+    drop {
+        io::println("Goodbye, World!");
+        *self.x += 1;
+    }
+}
+
+fn main() {
+    let x = @mut 0;
+
+    {
+        let mut res = foo(x);
+        
+        let mut v = ~[mut];
+        v <- ~[mut res] + v;
+    }
+
+    assert *x == 1;
+}