std: Remove deprecated/unstable num functionality

This commit removes all the old casting/generic traits from `std::num` that are
no longer in use by the standard library. This additionally removes the old
`strconv` module which has not seen much use in quite a long time. All generic
functionality has been supplanted with traits in the `num` crate and the
`strconv` module is supplanted with the [rust-strconv crate][rust-strconv].

[rust-strconv]: https://github.com/lifthrasiir/rust-strconv

This is a breaking change due to the removal of these deprecated crates, and the
alternative crates are listed above.

[breaking-change]

3 files changed, 20 insertions, 13 deletions

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 26463df1871..399810cb7f5 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -66,8 +66,6 @@ use parse::lexer;
 use ptr::P;
 
 use std::fmt;
-#[allow(deprecated)]
-use std::num::Int;
 use std::rc::Rc;
 use serialize::{Encodable, Decodable, Encoder, Decoder};
 
@@ -1142,16 +1140,24 @@ pub enum Sign {
 }
 
 impl Sign {
-    #[allow(deprecated)] // Int
-    pub fn new<T:Int>(n: T) -> Sign {
-        if n < Int::zero() {
-            Minus
-        } else {
-            Plus
-        }
+    pub fn new<T: IntSign>(n: T) -> Sign {
+        n.sign()
     }
 }
 
+pub trait IntSign {
+    fn sign(&self) -> Sign;
+}
+macro_rules! doit {
+    ($($t:ident)*) => ($(impl IntSign for $t {
+        #[allow(unused_comparisons)]
+        fn sign(&self) -> Sign {
+            if *self < 0 {Minus} else {Plus}
+        }
+    })*)
+}
+doit! { i8 i16 i32 i64 isize u8 u16 u32 u64 usize }
+
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum LitIntType {
     SignedIntLit(IntTy, Sign),
diff --git a/src/libsyntax/codemap.rs b/src/libsyntax/codemap.rs
index dfdaa47d8b9..835d0395199 100644
--- a/src/libsyntax/codemap.rs
+++ b/src/libsyntax/codemap.rs
@@ -20,7 +20,6 @@
 pub use self::MacroFormat::*;
 
 use std::cell::RefCell;
-use std::num::ToPrimitive;
 use std::ops::{Add, Sub};
 use std::rc::Rc;
 
@@ -862,7 +861,11 @@ impl CodeMap {
     pub fn record_expansion(&self, expn_info: ExpnInfo) -> ExpnId {
         let mut expansions = self.expansions.borrow_mut();
         expansions.push(expn_info);
-        ExpnId(expansions.len().to_u32().expect("too many ExpnInfo's!") - 1)
+        let len = expansions.len();
+        if len > u32::max_value() as usize {
+            panic!("too many ExpnInfo's!");
+        }
+        ExpnId(len as u32 - 1)
     }
 
     pub fn with_expn_info<T, F>(&self, id: ExpnId, f: F) -> T where
diff --git a/src/libsyntax/parse/mod.rs b/src/libsyntax/parse/mod.rs
index 4b7b7b66582..f4b108c4352 100644
--- a/src/libsyntax/parse/mod.rs
+++ b/src/libsyntax/parse/mod.rs
@@ -22,8 +22,6 @@ use std::cell::{Cell, RefCell};
 use std::fs::File;
 use std::io::Read;
 use std::iter;
-#[allow(deprecated)] // Int
-use std::num::Int;
 use std::path::{Path, PathBuf};
 use std::rc::Rc;
 use std::str;