Function parse_phpt 

pub fn parse_phpt(content: &str, path: &str) -> (String, Vec<ExpectedIssue>)

Parse a .phpt fixture file into (php_source, expected_issues).

Fixture format:

===source===
<?php
...
===expect===
UndefinedClass: UnknownClass
UndefinedFunction: foo()

An empty ===expect=== section means no issues are expected.