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Description
In 3.12 and 3.13, f-strings are not warning about invalid escapes that get warnings in real strings. This seems like a bug.
>>> f'\?''\\?'>>> len(f'\?')2>>> '\?'<stdin>:1: SyntaxWarning: invalid escape sequence '\?''\\?'_Originally posted by @terryjreedy in https://github.com/python/cpython/issues/105784#issuecomment-1591828755_ <!-- gh-linked-prs -->### Linked PRs* gh-105801* gh-105806<!-- /gh-linked-prs -->