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/libsync/comm/duplex.rs b/src/libsync/comm/duplex.rs
index 3840e55bb42..4ab2ac97cc1 100644
--- a/src/libsync/comm/duplex.rs
+++ b/src/libsync/comm/duplex.rs
@@ -64,7 +64,7 @@ mod test {
         let (left, right) = duplex();
 
         left.send("abc".to_string());
-        right.send(123);
+        right.send(123i);
 
         assert!(left.recv() == 123);
         assert!(right.recv() == "abc".to_string());
diff --git a/src/libsync/comm/mod.rs b/src/libsync/comm/mod.rs
index 3e8f4eef370..665f94d80b2 100644
--- a/src/libsync/comm/mod.rs
+++ b/src/libsync/comm/mod.rs
@@ -1543,7 +1543,7 @@ mod test {
         let (tx, rx) = channel();
         let (cdone, pdone) = channel();
         let t = Thread::start(proc() {
-            let mut hits = 0;
+            let mut hits = 0u;
             while hits < 10 {
                 match rx.try_recv() {
                     Ok(()) => { hits += 1; }
@@ -1993,7 +1993,7 @@ mod sync_tests {
         let (tx, rx) = sync_channel::<()>(0);
         let (cdone, pdone) = channel();
         let t = Thread::start(proc() {
-            let mut hits = 0;
+            let mut hits = 0u;
             while hits < 10 {
                 match rx.try_recv() {
                     Ok(()) => { hits += 1; }