Cannot use backslash as a literal string in conditional return type

[mad-briller]

i can't get phpstan to recognise \\ in a literal string: https://phpstan.org/r/41f1530f-eaee-4e7d-8bfc-e7ccc7cfc7a7

using any other sting there makes it work just fine: https://phpstan.org/r/a884b37d-682b-45a4-b891-1725ffd1c428

Originally posted by @mad-briller in https://github.com/phpstan/phpstan/issues/7483#issuecomment-1200168302

[rvanvelzen]

This is actually a feature request for phpstan/phpdoc-parser - it only trims away the surrounding quotes but doesn't un-escape the string otherwise, so '\\' actually becomes '\\\\'.

Changing this is technically a BC break though :/

[github-actions[bot]]

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