Change spans to use byte offsets instead of char offsets

src/libsyntax/attr.rs

@@ -6,7 +6,7 @@ use either::Either;
 use diagnostic::span_handler;
 use ast_util::{spanned, dummy_spanned};
 use parse::comments::{doc_comment_style, strip_doc_comment_decoration};
-use codemap::CharPos;
+use codemap::BytePos;
 
 // Constructors
 export mk_name_value_item_str;
@@ -76,7 +76,7 @@ fn mk_attr(item: @ast::meta_item) -> ast::attribute {
 }
 
 fn mk_sugared_doc_attr(text: ~str,
-                       +lo: CharPos, +hi: CharPos) -> ast::attribute {
+                       +lo: BytePos, +hi: BytePos) -> ast::attribute {
     let lit = spanned(lo, hi, ast::lit_str(@text));
     let attr = {
         style: doc_comment_style(text),