Fix crash with @var over echo

src/Psalm/Internal/PhpVisitor/ReflectorVisitor.php

@@ -451,6 +451,7 @@ class ReflectorVisitor extends PhpParser\NodeVisitorAbstract implements PhpParse
             || $node instanceof PhpParser\Node\Stmt\Foreach_
             || $node instanceof PhpParser\Node\Stmt\While_
             || $node instanceof PhpParser\Node\Stmt\Do_
+            || $node instanceof PhpParser\Node\Stmt\Echo_
         ) {
             if ($doc_comment = $node->getDocComment()) {
                 $var_comments = [];

tests/AnnotationTest.php

@@ -1168,6 +1168,11 @@ class AnnotationTest extends TestCase
 
                     function takesString(string $s): void {}'
             ],
+            'noCrashWithoutAssignment' => [
+                '<?php
+                    /** @var DateTime $obj */
+                    echo $obj->format("Y");'
+            ],
         ];
     }