test: Fix fallout in formatter tests

Author: richo

src/test/run-pass/ifmt.rs

@@ -42,6 +42,10 @@ impl fmt::Display for C {
 macro_rules! t {
     ($a:expr, $b:expr) => { assert_eq!($a, $b) }
 }
+#[cfg(target_pointer_width = "32")]
+const PTR: &'static str = "0x00001234";
+#[cfg(target_pointer_width = "64")]
+const PTR: &'static str = "0x0000000000001234";
 
 pub fn main() {
     // Various edge cases without formats
@@ -72,8 +76,8 @@ pub fn main() {
     t!(format!("{:X}", 10_usize), "A");
     t!(format!("{}", "foo"), "foo");
     t!(format!("{}", "foo".to_string()), "foo");
-    t!(format!("{:p}", 0x1234 as *const isize), "0x1234");
-    t!(format!("{:p}", 0x1234 as *mut isize), "0x1234");
+    t!(format!("{:p}", 0x1234 as *const isize), PTR);
+    t!(format!("{:p}", 0x1234 as *mut isize), PTR);
     t!(format!("{:x}", A), "aloha");
     t!(format!("{:X}", B), "adios");
     t!(format!("foo {} ☃☃☃☃☃☃", "bar"), "foo bar ☃☃☃☃☃☃");