expand parameters

Conflicts:
	test/compress/harmony.js

lib/parse.js

@@ -526,9 +526,16 @@ function tokenizer($TEXT, filename, html5_comments) {
 
     function handle_dot() {
         next();
-        return is_digit(peek().charCodeAt(0))
-            ? read_num(".")
-            : token("punc", ".");
+        if (is_digit(peek().charCodeAt(0))) {
+            return read_num(".");
+        }
+        if (peek() === ".") {
+            next();  // Consume second dot
+            next();  // Consume third dot
+            return token("expand", "...");
+        }
+
+        return token("punc", ".");
     };
 
     function read_word() {
@@ -1034,7 +1041,16 @@ function parse($TEXT, options) {
         S.in_parameters = true;
         while (!is("punc", ")")) {
             if (first) first = false; else expect(",");
-            a.push(expression(false));
+            if (is("expand", "...")) {
+                next();
+                a.push(new AST_Expansion({
+                    start: prev(),
+                    symbol: as_symbol(AST_SymbolFunarg),
+                    end: S.token,
+                }));
+            } else {
+                a.push(expression(false));
+            }
         }
         S.in_parameters = false;
         var end = S.token
@@ -1475,13 +1491,32 @@ function parse($TEXT, options) {
             return subscripts(new AST_Call({
                 start      : start,
                 expression : expr,
-                args       : expr_list(")"),
+                args       : call_args(),
                 end        : prev()
             }), true);
         }
         return expr;
     };
 
+    var call_args = embed_tokens(function call_args() {
+        var first = true;
+        var args = [];
+        while (!is("punc", ")")) {
+            if (first) first = false; else expect(",");
+            if (is("expand", "...")) {
+                next();
+                args.push(new AST_Expansion({
+                    start: prev(),
+                    symbol: as_symbol(AST_SymbolFunarg)
+                }));
+            } else {
+                args.push(expression(false));
+            }
+        }
+        next();
+        return args;
+    });
+
     var maybe_unary = function(allow_calls) {
         var start = S.token;
         if (is("operator") && UNARY_PREFIX(start.value)) {