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]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libsync/mpsc_queue.rs b/src/libsync/mpsc_queue.rs
index 4bb0acf580c..ecd37e68880 100644
--- a/src/libsync/mpsc_queue.rs
+++ b/src/libsync/mpsc_queue.rs
@@ -167,8 +167,8 @@ mod tests {
     #[test]
     fn test_full() {
         let q = Queue::new();
-        q.push(box 1);
-        q.push(box 2);
+        q.push(box 1i);
+        q.push(box 2i);
     }
 
     #[test]