librustc: Remove the fallback to `int` for integers and `f64` for

floating point numbers for real.

This will break code that looks like:

    let mut x = 0;
    while ... {
        x += 1;
    }
    println!("{}", x);

Change that code to:

    let mut x = 0i;
    while ... {
        x += 1;
    }
    println!("{}", x);

Closes #15201.

[breaking-change]

2 files changed, 3 insertions, 3 deletions

diff --git a/src/liballoc/arc.rs b/src/liballoc/arc.rs
index 6af4083edb2..38ed511c458 100644
--- a/src/liballoc/arc.rs
+++ b/src/liballoc/arc.rs
@@ -376,14 +376,14 @@ mod tests {
 
     #[test]
     fn test_live() {
-        let x = Arc::new(5);
+        let x = Arc::new(5i);
         let y = x.downgrade();
         assert!(y.upgrade().is_some());
     }
 
     #[test]
     fn test_dead() {
-        let x = Arc::new(5);
+        let x = Arc::new(5i);
         let y = x.downgrade();
         drop(x);
         assert!(y.upgrade().is_none());
diff --git a/src/liballoc/heap.rs b/src/liballoc/heap.rs
index 589ff8c1de9..dc8280e9b83 100644
--- a/src/liballoc/heap.rs
+++ b/src/liballoc/heap.rs
@@ -329,7 +329,7 @@ mod bench {
     #[bench]
     fn alloc_owned_small(b: &mut Bencher) {
         b.iter(|| {
-            box 10
+            box 10i
         })
     }
 }