Add a test for the type_name intrinsic.

Author: ecstatic-morse

tests/run-pass/intrinsics.rs

@@ -1,3 +1,6 @@
+#![feature(core_intrinsics)]
+
+use std::intrinsics::type_name;
 use std::mem::{size_of, size_of_val};
 
 fn main() {
@@ -7,4 +10,6 @@ fn main() {
     assert_eq!(size_of_val(&[] as &[i32]), 0);
     assert_eq!(size_of_val(&[1, 2, 3] as &[i32]), 12);
     assert_eq!(size_of_val("foobar"), 6);
+
+    assert_eq!(unsafe { type_name::<Option<i32>>() }, "core::option::Option<i32>");
 }