added support for hanging comma

Author: cseufert

src/parser/expr.js

@@ -645,6 +645,10 @@ module.exports = {
       conds.push(this.read_expr());
       while (this.token === ",") {
         this.next();
+        if (this.token === this.tok.T_DOUBLE_ARROW) {
+          this.next();
+          return conds;
+        }
         conds.push(this.read_expr());
       }
     }

test/snapshot/match.test.js

@@ -34,7 +34,7 @@ describe("match", () => {
   it("can have hanging comma", () => {
     const ast = parser.parseEval(`
     $test = match($test) {
-      true => 'ok',
+      true, => 'ok',
       false => 'Nope!',
     };
     `);