Property with heredoc default is always seen as not having a type #2742
Description
Bug report
A property that has a default in the heredoc format will always be seen as not having a type, this isn't the case for a regular string or Nowdoc
PHPStan 0.12.3
Code snippet that reproduces the problem
<?php declare(strict_types = 1);
class BugReportMailrcConfigTests
{
/** @var string */
private $s1 = <<<STRING
I'm a string :(
STRING;
/** @var string */
private $s2 = <<<'STRING'
I'm a string :)
STRING;
/** @var string */
private $s3 = 'I\'m a string :)';
}https://phpstan.org/r/e225ae46-945f-4327-bff5-77df51e1bf5b
Expected output
[OK] No errors