[issue28827] f-strings: format spec should not accept unicode escapes

[Yury Selivanov]

Yury Selivanov added the comment:

Also this inconsistency: we already don't accept escaped letters after `!`:

>>> f'{min!\N{LATIN SMALL LETTER R}}'
  File "<stdin>", line 1
SyntaxError: f-string: invalid conversion character: expected 's', 'r', or 'a'

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28827>
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