Add lint warning for $o->m()[0], not just f()[0]

Summary: We only caught half of this.

Test Plan: Unit test.

Reviewers: edward

Reviewed By: edward

CC: aran

Maniphest Tasks: T1261

Differential Revision: https://secure.phabricator.com/D4920

src/lint/linter/ArcanistXHPASTLinter.php

@@ -440,6 +440,7 @@ final class ArcanistXHPASTLinter extends ArcanistBaseXHPASTLinter {
       $left = $index->getChildByIndex(0);
       switch ($left->getTypeName()) {
         case 'n_FUNCTION_CALL':
+        case 'n_METHOD_CALL':
           $this->raiseLintAtNode(
             $index->getChildByIndex(1),
             self::LINT_PHP_54_FEATURES,

src/lint/linter/__tests__/xhpast/php54.lint-test

@@ -0,0 +1,8 @@
+<?php
+
+f()[0];
+$o->m()[0];
+
+~~~~~~~~~~
+disabled:3:5
+disabled:4:9