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, 1 insertions, 1 deletions

diff --git a/src/libregex/parse/mod.rs b/src/libregex/parse/mod.rs
index 2fea75746be..9cde40c1960 100644
--- a/src/libregex/parse/mod.rs
+++ b/src/libregex/parse/mod.rs
@@ -770,7 +770,7 @@ impl<'a> Parser<'a> {
         }
         let start = self.chari;
         let mut flags = self.flags;
-        let mut sign = 1;
+        let mut sign = 1i;
         let mut saw_flag = false;
         loop {
             try!(self.noteof("expected non-empty set of flags or closing ')'"))