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, 2 insertions, 4 deletions

diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index 8e36339b0e5..9549d5b8389 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -212,10 +212,8 @@ pub fn to_str(t: &Token) -> String {
           res.push_char('\'');
           res
       }
-      LIT_INT(i, t) => ast_util::int_ty_to_str(t, Some(i),
-                                               ast_util::ForceSuffix),
-      LIT_UINT(u, t) => ast_util::uint_ty_to_str(t, Some(u),
-                                                 ast_util::ForceSuffix),
+      LIT_INT(i, t) => ast_util::int_ty_to_str(t, Some(i)),
+      LIT_UINT(u, t) => ast_util::uint_ty_to_str(t, Some(u)),
       LIT_INT_UNSUFFIXED(i) => { (i as u64).to_str() }
       LIT_FLOAT(s, t) => {
         let mut body = String::from_str(get_ident(s).get());