libstd: Remove all uses of pure from libstd. rs=depure

Author: pcwalton

src/libstd/arena.rs

@@ -123,7 +123,7 @@ pub fn Arena() -> Arena {
 }
 
 #[inline(always)]
-pure fn round_up_to(base: uint, align: uint) -> uint {
+fn round_up_to(base: uint, align: uint) -> uint {
     (base + (align - 1)) & !(align - 1)
 }
 

src/libstd/base64.rs

@@ -13,11 +13,11 @@ use core::str;
 use core::vec;
 
 pub trait ToBase64 {
-    pure fn to_base64(&self) -> ~str;
+    fn to_base64(&self) -> ~str;
 }
 
 impl ToBase64 for &'self [u8] {
-    pure fn to_base64(&self) -> ~str {
+    fn to_base64(&self) -> ~str {
         let chars = str::chars(
           ~"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
         );
@@ -70,17 +70,17 @@ impl ToBase64 for &'self [u8] {
 }
 
 impl ToBase64 for &'self str {
-    pure fn to_base64(&self) -> ~str {
+    fn to_base64(&self) -> ~str {
         str::to_bytes(*self).to_base64()
     }
 }
 
 pub trait FromBase64 {
-    pure fn from_base64(&self) -> ~[u8];
+    fn from_base64(&self) -> ~[u8];
 }
 
 impl FromBase64 for ~[u8] {
-    pure fn from_base64(&self) -> ~[u8] {
+    fn from_base64(&self) -> ~[u8] {
         if self.len() % 4u != 0u { fail!(~"invalid base64 length"); }
 
         let len = self.len();
@@ -142,7 +142,7 @@ impl FromBase64 for ~[u8] {
 }
 
 impl FromBase64 for ~str {
-    pure fn from_base64(&self) -> ~[u8] {
+    fn from_base64(&self) -> ~[u8] {
         str::to_bytes(*self).from_base64()
     }
 }