René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"We need equivalent of parse_type_string() in native parser","articleBody":"This is needed to parse an arbitrary string as a type. This is especially important in context of `TypeForm` support (but is still needed in various other cases where we implicitly use old parser now, e.g. `cast()`, type alias targets etc).\n\nSince we may make many calls to this function per file, overhead of using a Python call may be significant. We should probably consider adding a mypyc primitive for this that would use a capsule import from `ast_serialize`. It looks like PyO3 does support capsules, see https://docs.rs/pyo3/latest/pyo3/types/struct.PyCapsule.html\n\nWe can have a dedicated function in `ast_serialize` with a (much) simpler signature that also doesn't try to serialize imports etc.\n\n@JukkaL what do you think?\n","author":{"url":"https://github.com/ilevkivskyi","@type":"Person","name":"ilevkivskyi"},"datePublished":"2026-05-19T21:15:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/21515/mypy/issues/21515"}