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/libnative/io/process.rs b/src/libnative/io/process.rs
index 00448b91dbd..b1c0d9a1506 100644
--- a/src/libnative/io/process.rs
+++ b/src/libnative/io/process.rs
@@ -1136,7 +1136,7 @@ fn waitpid(pid: pid_t, deadline: u64) -> IoResult<rtio::ProcessExit> {
     // which will wake up the other end at some point, so we just allow this
     // signal to be coalesced with the pending signals on the pipe.
     extern fn sigchld_handler(_signum: libc::c_int) {
-        let msg = 1;
+        let msg = 1i;
         match unsafe {
             libc::write(WRITE_FD, &msg as *const _ as *const libc::c_void, 1)
         } {