glayzzle#81 reproduce the error

Author: ichiriac

test/precedence.js

@@ -119,4 +119,11 @@ describe('Test precedence', function() {
   it('test + / *', function() {
     shouldBeSame('1 + 2 * 3', '1 + (2 * 3)');
   });
+  it('test assign', function() {
+    // https://github.com/glayzzle/php-parser/issues/81
+    shouldBeSame(
+      '$a and $b = $c and $d',
+      '($a and ($b = $c)) and $d'
+    );
+  });
 });