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, 3 insertions, 3 deletions

diff --git a/src/test/debuginfo/shadowed-variable.rs b/src/test/debuginfo/shadowed-variable.rs
index 825ecb9c0ca..88ef3c4879e 100644
--- a/src/test/debuginfo/shadowed-variable.rs
+++ b/src/test/debuginfo/shadowed-variable.rs
@@ -42,13 +42,13 @@ fn main() {
     zzz();
     sentinel();
 
-    let x = 10;
+    let x = 10i;
 
     zzz();
     sentinel();
 
-    let x = 10.5;
-    let y = 20;
+    let x = 10.5f64;
+    let y = 20i;
 
     zzz();
     sentinel();