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The default value 'undefined' was added to records field types in such
a way that the result was not always a well-formed type. This bug has
been fixed.
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erl_pp has since OTP-8150 formatted types so that 'undefined' was
removed from union types assigned to record fields. Since one cannot
distinguish between 'undefined' added by the parser or supplied by the
user, a side effect was that user supplied 'undefined's were also
removed.
Now the pretty printer shows 'undefined' even if added by the parser.
This is a minor issue.
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Expressions evaluating to integers can now be used in types and function
specifications where hitherto only integers were allowed
("Erlang_Integer").
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The erlang pretty printer (erl_pp) no longer quotes atoms in types.
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The abstract type 'fun' could not be printed. This bug has been fixed.
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