Jason R. Coombs added the comment:
The reason that those test_no_escapes_for_braces assertions pass is because
they're only dealing with opening curly braces and in an f-string, they're
treated as literal opening braces.
In the example you've given, the error occurs when the f-string handler
encounters the closing curly brace without an opening one. It's the same as if
you had written:
>>> f'{{4*10}'
SyntaxError: f-string: single '}' is not allowed
I will add a test to capture this specific case (backslash-escaped unicode
opening bracken).
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Python tracker <[email protected]>
<http://bugs.python.org/issue28590>
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