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]

Author: nikomatsakis

src/doc/guide-container.md

@@ -135,7 +135,7 @@ invalidation*. As long as an iterator is still in scope, the compiler will preve
 modification of the container through another handle.
 
 ~~~
-let mut xs = [1, 2, 3];
+let mut xs = [1i, 2, 3];
 {
     let _it = xs.iter();
 
@@ -155,16 +155,16 @@ example, the `fold` method will accumulate the items yielded by an `Iterator`
 into a single value:
 
 ~~~
-let xs = [1, 9, 2, 3, 14, 12];
+let xs = [1i, 9, 2, 3, 14, 12];
 let result = xs.iter().fold(0, |accumulator, item| accumulator - *item);
 assert_eq!(result, -41);
 ~~~
 
 Most adaptors return an adaptor object implementing the `Iterator` trait itself:
 
 ~~~
-let xs = [1, 9, 2, 3, 14, 12];
-let ys = [5, 2, 1, 8];
+let xs = [1i, 9, 2, 3, 14, 12];
+let ys = [5i, 2, 1, 8];
 let sum = xs.iter().chain(ys.iter()).fold(0, |a, b| a + *b);
 assert_eq!(sum, 57);
 ~~~
@@ -180,8 +180,8 @@ iterator adaptor named `fuse()` is provided. This returns an iterator that will
 never call its underlying iterator again once `None` has been returned:
 
 ~~~
-let xs = [1,2,3,4,5];
-let mut calls = 0;
+let xs = [1i,2,3,4,5];
+let mut calls = 0i;
 
 {
     let it = xs.iter().scan((), |_, x| {
@@ -209,11 +209,11 @@ assert_eq!(calls, 3);
 The function `range` (or `range_inclusive`) allows to simply iterate through a given range:
 
 ~~~
-for i in range(0, 5) {
+for i in range(0i, 5) {
   print!("{} ", i) // prints "0 1 2 3 4"
 }
 
-for i in std::iter::range_inclusive(0, 5) { // needs explicit import
+for i in std::iter::range_inclusive(0i, 5) { // needs explicit import
   print!("{} ", i) // prints "0 1 2 3 4 5"
 }
 ~~~
@@ -238,7 +238,7 @@ For loops are *often* used with a temporary iterator object, as above. They can
 also advance the state of an iterator in a mutable location:
 
 ~~~
-let xs = [1, 2, 3, 4, 5];
+let xs = [1i, 2, 3, 4, 5];
 let ys = ["foo", "bar", "baz", "foobar"];
 
 // create an iterator yielding tuples of elements from both vectors
@@ -265,7 +265,7 @@ assert!(it.next().is_none());
 Iterators offer generic conversion to containers with the `collect` adaptor:
 
 ~~~
-let xs = [0, 1, 1, 2, 3, 5, 8];
+let xs = [0i, 1, 1, 2, 3, 5, 8];
 let ys = xs.iter().rev().skip(1).map(|&x| x * 2).collect::<Vec<int>>();
 assert_eq!(ys, vec![10, 6, 4, 2, 2, 0]);
 ~~~
@@ -347,7 +347,7 @@ A `DoubleEndedIterator` can have its direction changed with the `rev` adaptor,
 returning another `DoubleEndedIterator` with `next` and `next_back` exchanged.
 
 ~~~
-let xs = [1, 2, 3, 4, 5, 6];
+let xs = [1i, 2, 3, 4, 5, 6];
 let mut it = xs.iter();
 println!("{}", it.next()); // prints `Some(1)`
 println!("{}", it.next()); // prints `Some(2)`
@@ -363,8 +363,8 @@ The `chain`, `map`, `filter`, `filter_map` and `inspect` adaptors are
 `DoubleEndedIterator` implementations if the underlying iterators are.
 
 ~~~
-let xs = [1, 2, 3, 4];
-let ys = [5, 6, 7, 8];
+let xs = [1i, 2, 3, 4];
+let ys = [5i, 6, 7, 8];
 let mut it = xs.iter().chain(ys.iter()).map(|&x| x * 2);
 
 println!("{}", it.next()); // prints `Some(2)`
@@ -380,9 +380,9 @@ mutable references. It can be used to reverse a container in-place. Note that
 the trailing underscore is a workaround for issue #5898 and will be removed.
 
 ~~~
-let mut ys = [1, 2, 3, 4, 5];
+let mut ys = [1i, 2, 3, 4, 5];
 ys.mut_iter().reverse_();
-assert!(ys == [5, 4, 3, 2, 1]);
+assert!(ys == [5i, 4, 3, 2, 1]);
 ~~~
 
 ## Random-access iterators
@@ -395,8 +395,8 @@ The `chain` adaptor is an implementation of `RandomAccessIterator` if the
 underlying iterators are.
 
 ~~~
-let xs = [1, 2, 3, 4, 5];
-let ys = [7, 9, 11];
+let xs = [1i, 2, 3, 4, 5];
+let ys = [7i, 9, 11];
 let mut it = xs.iter().chain(ys.iter());
 println!("{}", it.idx(0)); // prints `Some(1)`
 println!("{}", it.idx(5)); // prints `Some(7)`

src/doc/guide-lifetimes.md

@@ -577,7 +577,7 @@ This is equivalent to the previous definition.
 Named lifetime notation can also be used to control the flow of execution:
 
 ~~~
-'h: for i in range(0,10) {
+'h: for i in range(0u, 10) {
     'g: loop {
         if i % 2 == 0 { continue 'h; }
         if i == 9 { break 'h; }

src/doc/guide-pointers.md

@@ -315,7 +315,7 @@ duration a 'lifetime'. Let's try a more complex example:
 
 ~~~rust
 fn main() {
-    let mut x = box 5;
+    let mut x = box 5i;
     if *x < 10 {
         let y = &x;
         println!("Oh no: {}", y);
@@ -332,7 +332,7 @@ mutated, and therefore, lets us pass. This wouldn't work:
 
 ~~~rust{.ignore}
 fn main() {
-    let mut x = box 5;
+    let mut x = box 5i;
     if *x < 10 {
         let y = &x;
         *x -= 1;

src/doc/guide-testing.md

@@ -269,7 +269,7 @@ use test::Bencher;
 #[bench]
 fn bench_xor_1000_ints(b: &mut Bencher) {
     b.iter(|| {
-        range(0, 1000).fold(0, |old, new| old ^ new);
+        range(0u, 1000).fold(0, |old, new| old ^ new);
     });
 }
 ~~~
@@ -293,7 +293,7 @@ example above by adjusting the `bh.iter` call to
 # struct X; impl X { fn iter<T>(&self, _: || -> T) {} } let b = X;
 b.iter(|| {
     // note lack of `;` (could also use an explicit `return`).
-    range(0, 1000).fold(0, |old, new| old ^ new)
+    range(0u, 1000).fold(0, |old, new| old ^ new)
 });
 ~~~
 
@@ -307,7 +307,7 @@ extern crate test;
 # fn main() {
 # struct X; impl X { fn iter<T>(&self, _: || -> T) {} } let b = X;
 b.iter(|| {
-    test::black_box(range(0, 1000).fold(0, |old, new| old ^ new));
+    test::black_box(range(0u, 1000).fold(0, |old, new| old ^ new));
 });
 # }
 ~~~

src/doc/intro.md

@@ -198,7 +198,7 @@ Typically, tasks do not share memory but instead communicate amongst each other
 
 ```
 fn main() {
-    let numbers = vec![1,2,3];
+    let numbers = vec![1i, 2i, 3i];
 
     let (tx, rx)  = channel();
     tx.send(numbers);
@@ -237,7 +237,7 @@ try to modify the previous example to continue using the variable `numbers`:
 
 ```ignore
 fn main() {
-    let numbers = vec![1,2,3];
+    let numbers = vec![1i, 2i, 3i];
 
     let (tx, rx)  = channel();
     tx.send(numbers);
@@ -267,9 +267,9 @@ Let's see an example that uses the `clone` method to create copies of the data:
 
 ```
 fn main() {
-    let numbers = vec![1,2,3];
+    let numbers = vec![1i, 2i, 3i];
 
-    for num in range(0, 3) {
+    for num in range(0u, 3) {
         let (tx, rx)  = channel();
         // Use `clone` to send a *copy* of the array
         tx.send(numbers.clone());
@@ -300,10 +300,10 @@ Here's some code:
 use std::sync::Arc;
 
 fn main() {
-    let numbers = vec![1,2,3];
+    let numbers = vec![1i, 2i, 3i];
     let numbers = Arc::new(numbers);
 
-    for num in range(0, 3) {
+    for num in range(0u, 3) {
         let (tx, rx)  = channel();
         tx.send(numbers.clone());
 
@@ -346,10 +346,10 @@ and modify it to mutate the shared state:
 use std::sync::{Arc, Mutex};
 
 fn main() {
-    let numbers = vec![1,2,3];
+    let numbers = vec![1i, 2i, 3i];
     let numbers_lock = Arc::new(Mutex::new(numbers));
 
-    for num in range(0, 3) {
+    for num in range(0u, 3) {
         let (tx, rx)  = channel();
         tx.send(numbers_lock.clone());
 

src/doc/rust.md

@@ -955,11 +955,12 @@ use std::option::{Some, None};
 # fn foo<T>(_: T){}
 
 fn main() {
-    // Equivalent to 'std::iter::range_step(0, 10, 2);'
-    range_step(0, 10, 2);
+    // Equivalent to 'std::iter::range_step(0u, 10u, 2u);'
+    range_step(0u, 10u, 2u);
 
-    // Equivalent to 'foo(vec![std::option::Some(1.0), std::option::None]);'
-    foo(vec![Some(1.0), None]);
+    // Equivalent to 'foo(vec![std::option::Some(1.0f64),
+    // std::option::None]);'
+    foo(vec![Some(1.0f64), None]);
 }
 ~~~~
 
@@ -1475,7 +1476,7 @@ to pointers to the trait name, used as a type.
 ~~~~
 # trait Shape { }
 # impl Shape for int { }
-# let mycircle = 0;
+# let mycircle = 0i;
 let myshape: Box<Shape> = box mycircle as Box<Shape>;
 ~~~~
 
@@ -3613,7 +3614,7 @@ and no-return value closure has type `proc()`.
 An example of creating and calling a closure:
 
 ```rust
-let captured_var = 10;
+let captured_var = 10i;
 
 let closure_no_args = || println!("captured_var={}", captured_var);
 
@@ -3685,7 +3686,7 @@ fn print(a: Box<Printable>) {
 }
 
 fn main() {
-   print(box 10 as Box<Printable>);
+   print(box 10i as Box<Printable>);
 }
 ~~~~