syntax: use lookahead to distinguish inner and outer attributes, instead of passing the latter around.

src/libsyntax/util/parser_testing.rs

@@ -58,14 +58,14 @@ pub fn string_to_expr (source_str : String) -> P<ast::Expr> {
 /// Parse a string, return an item
 pub fn string_to_item (source_str : String) -> Option<P<ast::Item>> {
     with_error_checking_parse(source_str, |p| {
-        p.parse_item(Vec::new())
+        p.parse_item()
     })
 }
 
 /// Parse a string, return a stmt
 pub fn string_to_stmt(source_str : String) -> P<ast::Stmt> {
     with_error_checking_parse(source_str, |p| {
-        p.parse_stmt(Vec::new())
+        p.parse_stmt().unwrap()
     })
 }