"Uncaught TypeError: Illegal offset type" with PHP 8.0-dev JIT on Windows

[sebastianbergmann]

The error shown below is triggered while running the tests for PHPUnit 9.3 (master) with PHP 8.0-dev and JIT (opcache.enable=1, opcache.enable_cli=1, opcache.optimization_level=-1, opcache.jit=1205, opcache.jit_buffer_size=4096M) on Windows:

PHP Fatal error:  Uncaught TypeError: Illegal offset type in D:\a\phpunit\phpunit\vendor\phpunit\php-token-stream\src\Token\Stream.php:658
Stack trace:
#0 D:\a\phpunit\phpunit\vendor\phpunit\php-token-stream\src\Token\Stream.php(622): PHP_Token_Stream->addFunctionToMap()
#1 D:\a\phpunit\phpunit\vendor\phpunit\php-token-stream\src\Token\Stream.php(175): PHP_Token_Stream->parse()
#2 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\File.php(478): PHP_Token_Stream->getClasses()
#3 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\File.php(354): SebastianBergmann\CodeCoverage\Node\File->processClasses()
#4 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\File.php(145): SebastianBergmann\CodeCoverage\Node\File->calculateStatistics()
#5 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\Directory.php(165): SebastianBergmann\CodeCoverage\Node\File->__construct()
#6 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\Builder.php(59): SebastianBergmann\CodeCoverage\Node\Directory->addFile()
#7 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\Builder.php(63): SebastianBergmann\CodeCoverage\Node\Builder->addItems()
#8 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\Builder.php(63): SebastianBergmann\CodeCoverage\Node\Builder->addItems()
#9 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\Builder.php(63): SebastianBergmann\CodeCoverage\Node\Builder->addItems()
#10 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Node\Builder.php(44): SebastianBergmann\CodeCoverage\Node\Builder->addItems()
#11 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\CodeCoverage.php(147): SebastianBergmann\CodeCoverage\Node\Builder->build()
#12 D:\a\phpunit\phpunit\vendor\phpunit\php-code-coverage\src\Report\Clover.php(55): SebastianBergmann\CodeCoverage\CodeCoverage->getReport()
#13 D:\a\phpunit\phpunit\src\TextUI\TestRunner.php(706): SebastianBergmann\CodeCoverage\Report\Clover->process()
#14 D:\a\phpunit\phpunit\src\TextUI\Command.php(134): PHPUnit\TextUI\TestRunner->run()
#15 D:\a\phpunit\phpunit\src\TextUI\Command.php(94): PHPUnit\TextUI\Command->run()
#16 D:\a\phpunit\phpunit\phpunit(61): PHPUnit\TextUI\Command::main()
#17 {main}
  thrown in D:\a\phpunit\phpunit\vendor\phpunit\php-token-stream\src\Token\Stream.php on line 658

This is the GitHub Action in question: https://github.com/sebastianbergmann/phpunit/runs/840483759?check_suite_focus=true

The code in question looks like this:

656    private function addFunctionToMap($name, $startLine, $endLine): void
656    {
657        for ($line = $startLine; $line <= $endLine; $line++) {
658            $this->lineToFunctionMap[$line] = $name;
659        }
660    }

The error is not triggered with PHP 8.0-dev and JIT on Linux (or with any other PHP configuration that is tested against in PHPUnit's CI pipeline).

[sebastianbergmann]

Moved to https://bugs.php.net/bug.php?id=79798.