Move ToString to collections::string

This also impls `FormatWriter` for `Vec<u8>`

src/libcollections/string.rs

@@ -808,6 +808,20 @@ pub trait IntoString {
     fn into_string(self) -> String;
 }
 
+/// A generic trait for converting a value to a string
+pub trait ToString {
+    /// Converts the value of `self` to an owned string
+    fn to_string(&self) -> String;
+}
+
+impl<T: fmt::Show> ToString for T {
+    fn to_string(&self) -> String {
+        let mut buf = Vec::<u8>::new();
+        let _ = format_args!(|args| fmt::write(&mut buf, args), "{}", self);
+        String::from_utf8(buf).unwrap()
+    }
+}
+
 /// Unsafe operations
 #[unstable = "waiting on raw module conventions"]
 pub mod raw {
@@ -873,7 +887,7 @@ mod tests {
 
     use str;
     use str::{Str, StrPrelude, Owned};
-    use super::{as_string, String};
+    use super::{as_string, String, ToString};
     use vec::Vec;
     use slice::CloneSliceAllocPrelude;
 
@@ -1177,6 +1191,28 @@ mod tests {
         assert_eq!("oob", s[1..4]);
     }
 
+    #[test]
+    fn test_simple_types() {
+        assert_eq!(1i.to_string(), "1".to_string());
+        assert_eq!((-1i).to_string(), "-1".to_string());
+        assert_eq!(200u.to_string(), "200".to_string());
+        assert_eq!(2u8.to_string(), "2".to_string());
+        assert_eq!(true.to_string(), "true".to_string());
+        assert_eq!(false.to_string(), "false".to_string());
+        assert_eq!(().to_string(), "()".to_string());
+        assert_eq!(("hi".to_string()).to_string(), "hi".to_string());
+    }
+
+    #[test]
+    fn test_vectors() {
+        let x: Vec<int> = vec![];
+        assert_eq!(x.to_string(), "[]".to_string());
+        assert_eq!((vec![1i]).to_string(), "[1]".to_string());
+        assert_eq!((vec![1i, 2, 3]).to_string(), "[1, 2, 3]".to_string());
+        assert!((vec![vec![], vec![1i], vec![1i, 1]]).to_string() ==
+               "[[], [1], [1, 1]]".to_string());
+    }
+
     #[bench]
     fn bench_with_capacity(b: &mut Bencher) {
         b.iter(|| {

src/libcollections/vec.rs

@@ -1653,6 +1653,13 @@ impl<T> Vec<T> {
     }
 }
 
+impl<'a> fmt::FormatWriter for Vec<u8> {
+    fn write(&mut self, buf: &[u8]) -> fmt::Result {
+        self.push_all(buf);
+        Ok(())
+    }
+}
+
 #[cfg(test)]
 mod tests {
     extern crate test;

src/libstd/lib.rs

@@ -220,7 +220,6 @@ pub mod time;
 
 pub mod error;
 pub mod num;
-pub mod to_string;
 
 /* Common data structures */
 

src/libstd/num/strconv.rs

@@ -423,7 +423,7 @@ static DIGIT_E_RADIX: uint = ('e' as uint) - ('a' as uint) + 11u;
 
 #[cfg(test)]
 mod tests {
-    use to_string::ToString;
+    use string::ToString;
 
     #[test]
     fn test_int_to_str_overflow() {

src/libstd/os.rs

@@ -51,8 +51,7 @@ use result::{Err, Ok, Result};
 use slice::{AsSlice, SlicePrelude, PartialEqSlicePrelude};
 use slice::CloneSliceAllocPrelude;
 use str::{Str, StrPrelude, StrAllocating};
-use string::String;
-use to_string::ToString;
+use string::{String, ToString};
 use sync::atomic::{AtomicInt, INIT_ATOMIC_INT, SeqCst};
 use vec::Vec;
 

src/libstd/prelude.rs

@@ -76,14 +76,13 @@
 #[doc(no_inline)] pub use io::{Buffer, Writer, Reader, Seek};
 #[doc(no_inline)] pub use str::{Str, StrVector, StrPrelude};
 #[doc(no_inline)] pub use str::{IntoMaybeOwned, StrAllocating, UnicodeStrPrelude};
-#[doc(no_inline)] pub use to_string::ToString;
 #[doc(no_inline)] pub use tuple::{Tuple1, Tuple2, Tuple3, Tuple4};
 #[doc(no_inline)] pub use tuple::{Tuple5, Tuple6, Tuple7, Tuple8};
 #[doc(no_inline)] pub use tuple::{Tuple9, Tuple10, Tuple11, Tuple12};
 #[doc(no_inline)] pub use slice::{SlicePrelude, AsSlice, CloneSlicePrelude};
 #[doc(no_inline)] pub use slice::{VectorVector, PartialEqSlicePrelude, OrdSlicePrelude};
 #[doc(no_inline)] pub use slice::{CloneSliceAllocPrelude, OrdSliceAllocPrelude, SliceAllocPrelude};
-#[doc(no_inline)] pub use string::{IntoString, String};
+#[doc(no_inline)] pub use string::{IntoString, String, ToString};
 #[doc(no_inline)] pub use vec::Vec;
 
 // Reexported runtime types

src/libstd/task.rs

@@ -105,9 +105,8 @@ use rt::local::Local;
 use rt::task;
 use rt::task::Task;
 use str::{Str, SendStr, IntoMaybeOwned};
-use string::String;
+use string::{String, ToString};
 use sync::Future;
-use to_string::ToString;
 
 /// A means of spawning a task
 pub trait Spawner {

src/libstd/time/duration.rs

@@ -388,7 +388,7 @@ mod tests {
     use super::{Duration, MIN, MAX};
     use {i32, i64};
     use option::{Some, None};
-    use to_string::ToString;
+    use string::ToString;
 
     #[test]
     fn test_duration() {

src/test/run-pass/class-cast-to-trait-cross-crate-2.rs

@@ -11,7 +11,7 @@
 // aux-build:cci_class_cast.rs
 extern crate cci_class_cast;
 
-use std::to_string::ToString;
+use std::string::ToString;
 use cci_class_cast::kitty::cat;
 
 fn print_out(thing: Box<ToString>, expected: String) {

src/test/run-pass/send_str_treemap.rs

@@ -11,7 +11,7 @@
 extern crate collections;
 
 use std::str::{SendStr, Owned, Slice};
-use std::to_string::ToString;
+use std::string::ToString;
 use self::collections::TreeMap;
 use std::option::Some;