Factor out NamedParseResult.

Author: Mark-Simulacrum

src/libsyntax/ext/tt/macro_parser.rs

@@ -143,6 +143,8 @@ pub struct MatcherPos {
     sp_lo: BytePos,
 }
 
+pub type NamedParseResult = ParseResult<HashMap<Ident, Rc<NamedMatch>>>;
+
 pub fn count_names(ms: &[TokenTree]) -> usize {
     ms.iter().fold(0, |count, elt| {
         count + match *elt {
@@ -200,8 +202,7 @@ pub enum NamedMatch {
     MatchedNonterminal(Rc<Nonterminal>)
 }
 
-fn nameize(ms: &[TokenTree], res: &[Rc<NamedMatch>])
-            -> ParseResult<HashMap<Ident, Rc<NamedMatch>>> {
+fn nameize(ms: &[TokenTree], res: &[Rc<NamedMatch>]) -> NamedParseResult {
     fn n_rec(m: &TokenTree, res: &[Rc<NamedMatch>],
              ret_val: &mut HashMap<Ident, Rc<NamedMatch>>, idx: &mut usize)
              -> Result<(), (syntax_pos::Span, String)> {
@@ -265,8 +266,6 @@ pub fn parse_failure_msg(tok: Token) -> String {
     }
 }
 
-pub type NamedParseResult = ParseResult<HashMap<Ident, Rc<NamedMatch>>>;
-
 /// Perform a token equality check, ignoring syntax context (that is, an
 /// unhygienic comparison)
 pub fn token_name_eq(t1 : &Token, t2 : &Token) -> bool {