Regex patterns with concatenated raw strings are inferred as Pattern[LiteralString] instead of Pattern[str] #2129
Description
Describe the Bug
After upgrading from 0.48.0 to 0.48.1, I now see a warning with code like this:
import re
pattern = re.compile(r'hi' + r'hi')
re.match(pattern, '') # No matching overload found for function `re.match` called with arguments: (Pattern[LiteralString], Literal['']) [no-matching-overload]Pyright, ty, mypy, and zuban infer the pattern variable as Pattern[str] instead of Pattern[LiteralString].
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