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[3.12] gh-116881: Remove erroneous or redundant grammar NULL (GH-116885) (#116951)

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In Lexical Analysis f-strings section, NULL in the description
of 'literal character' means '\0'.  In the format_spec grammar
production, it is wrong with that meaning and redundant if
instead interpreted as <nothing>.  Remove it there.
(cherry picked from commit 4e45c6c54a)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
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Miss Islington (bot) 2024-03-18 15:37:26 +01:00 • committed by GitHub
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Doc/reference/lexical_analysis.rst
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@ -733,7 +733,7 @@ for the contents of the string is:
: ("," `conditional_expression` | "," "*" `or_expr`)* [","]
: | `yield_expression`
conversion: "s" | "r" | "a"
format_spec: (`literal_char` | NULL | `replacement_field`)*
format_spec: (`literal_char` | `replacement_field`)*
literal_char: <any code point except "{", "}" or NULL>
The parts of the string outside curly braces are treated literally,