Process error in just one file of 756 files: Name cannot be empty while analysing file /path/to/file/file.php about phpstan HOT 5 OPEN

This bug report is missing a link to reproduction at phpstan.org/try.

It will most likely be closed after manual review.

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Please reproduce the issue with a minimal code snippet.

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My file has PHP and HTML in the same file, trying to reduce the code and testing, I managed to get to this minimum piece of code to analyze.

https://phpstan.org/r/1b2b6ea3-65d6-4ba1-8a6e-bf82a013b137

Apparently the problem is in the constant() method, because removing the method, the file will run succesfully.

Edit: Doing some tests here, I found another information about the problem, the method only causes problems if used with a variable.

Edit2: another file having the constant($variable) method used don't show any errors, it's just with this specific code snippet.

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So there's a case where your code runs with constant('')? What's the purpose?

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It's not exactly on purpose, it's legacy code with a lot of old and incorrect implementations, I figured PHPStan would mention the problem to fix it, but this is breaking PHPStan itself.
If it's not a valid issue, that's fine, but I think it will be a good source of answers for others facing the same problem.

The code was much larger, this is just a small part of the code to reproduce the error. This $sysERR variable can be changed in the middle of the code, so it is not exactly empty, the empty is just the first initialization of the variable and even then PHPStan is breaking.

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