zeroOrMore and optional don't seem to work as documented.

[Rusty Phillips]

Using parboiled_2.12 v2.16

This:

 def TestZero: Rule1[Seq[String]] = rule (
    zeroOrMore(capture("aa"))
  )

and this:

 def TestZero: Rule1[Seq[String]] = rule (
    optional(oneOrMore(capture("aa")))
  )

Both produce this error:
Expression of type Rule[HNil, StrictOut] doesn't conform to expected type Parboiled2.Rule1[Seq[String]]

In contrast, this does work:

 def TestZero: Rule1[Seq[String]] = rule (
    oneOrMore(capture("aa"))
  )

According to the docs, all three of these options are being used correctly (as far as I can tell).

What am I missing?

[Thomas Suckow]

Pretty sure you want Option[Seq[String]]]

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