librustc: Remove the fallback to `int` from typechecking.

This breaks a fair amount of code. The typical patterns are:

* `for _ in range(0, 10)`: change to `for _ in range(0u, 10)`;

* `println!("{}", 3)`: change to `println!("{}", 3i)`;

* `[1, 2, 3].len()`: change to `[1i, 2, 3].len()`.

RFC #30. Closes #6023.

[breaking-change]

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libstd/sync/future.rs b/src/libstd/sync/future.rs
index ccc67e3f8b0..78da605143d 100644
--- a/src/libstd/sync/future.rs
+++ b/src/libstd/sync/future.rs
@@ -181,7 +181,7 @@ mod test {
 
     #[test]
     fn test_get_ref_method() {
-        let mut f = Future::from_value(22);
+        let mut f = Future::from_value(22i);
         assert_eq!(*f.get_ref(), 22);
     }