f-strings do not show warnings about invalid escapes #105800
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 -->