adjust and un-xfail

src/test/run-pass/bind-native-fn.rs

@@ -0,0 +1,21 @@
+// From #1174:
+// xfail-test bots are crashing on this on x86_64
+
+use std;
+import std::str;
+import std::ctypes::*;
+
+#[link_name = ""]
+native mod libc {
+    fn write(fd: c_int, buf: *u8, nbyte: size_t);
+}
+
+fn main() {
+    let s = "hello world\n";
+    let b = str::bytes(s);
+    let l = str::byte_len(s);
+    let b8 = unsafe { std::vec::unsafe::to_ptr(b) };
+    libc::write(0i32, b8, l);
+    let a = bind libc::write(0i32, _, _);
+    a(b8, l);
+}

src/test/run-pass/bind-native-printf.rs

@@ -1,17 +0,0 @@
-// From #1174:
-// xfail-test bots are crashing on this on x86_64
-
-use std;
-
-#[link_name = ""]
-native mod libc {
-    fn printf(s: *u8, a: int); /* A tenuous definition. */
-}
-
-fn main() {
-    let b = std::str::bytes("%d\n");
-    let b8 = unsafe { std::vec::unsafe::to_ptr(b) };
-    libc::printf(b8, 4);
-    let a = bind libc::printf(b8, 5);
-    a(); /* core dump */
-}