Rename to_str to to_string

Closes #15796.

[breaking-change]

src/libstd/ascii.rs

@@ -20,7 +20,7 @@ use option::{Option, Some, None};
 use slice::{ImmutableVector, MutableVector, Vector};
 use str::{OwnedStr, Str, StrAllocating, StrSlice};
 use string::String;
-use to_str::{IntoStr};
+use to_string::IntoStr;
 use vec::Vec;
 
 /// Datatype to hold one ascii character. It wraps a `u8`, with the highest bit always zero.

src/libstd/lib.rs

@@ -239,7 +239,7 @@ pub mod gc;
 
 pub mod from_str;
 pub mod num;
-pub mod to_str;
+pub mod to_string;
 
 /* Common data structures */
 

src/libstd/prelude.rs

@@ -78,7 +78,7 @@
 #[doc(no_inline)] pub use io::{Buffer, Writer, Reader, Seek};
 #[doc(no_inline)] pub use str::{Str, StrVector, StrSlice, OwnedStr};
 #[doc(no_inline)] pub use str::{IntoMaybeOwned, StrAllocating, UnicodeStrSlice};
-#[doc(no_inline)] pub use to_str::{ToString, IntoStr};
+#[doc(no_inline)] pub use to_string::{ToString, IntoStr};
 #[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};

src/libstd/task.rs

@@ -106,7 +106,7 @@ use rt::task::Task;
 use str::{Str, SendStr, IntoMaybeOwned};
 use string::String;
 use sync::Future;
-use to_str::ToString;
+use to_string::ToString;
 
 /// A means of spawning a task
 pub trait Spawner {

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_str::ToString;
+use std::to_string::ToString;
 use cci_class_cast::kitty::cat;
 
 fn print_out(thing: Box<ToString>, expected: String) {

src/test/run-pass/send_str_treemap.rs

@@ -12,7 +12,7 @@ extern crate collections;
 
 use std::collections::{ Map, MutableMap};
 use std::str::{SendStr, Owned, Slice};
-use std::to_str::ToString;
+use std::to_string::ToString;
 use self::collections::TreeMap;
 use std::option::Some;