Parse error for optional field with attribute

[cknitt]

This

type x = {
  @someAttr
  a?: int,
}

gives

  Syntax error!
  Test.res:3:4

  1 │ type x = {
  2 │   @someAttr
  3 │   a?: int,
  4 │ }
  5 │

  I'm not sure what to parse here when looking at "?".

[cristianoc]

Thank you for the report.
What was the original example like? Contrived or everyday?

[cknitt]

Originally I was thinking about whether we still need @deriving(abstract) with @optional on a field or if we could deprecate that in favor of records with optional fields.

Then I tried out what would happen if I had an optional field + the deriving abstract @optional annotation and came across the above problem.

However, one could also run into this when trying to use @as(...) or maybe some attribute for JSON serialization like what decco uses.

[cristianoc]

Thanks. Marking for 10.1.

[cristianoc]

So this seems to affect only single-field records: #628