Incorrect parsing of nested comments

[holzensp]

As per the change in test/corpus/basic/comments.txt in #16;

y = 20 /*
multi
line
/* nested */
comment
*/ z = 30

produces

  (classProperty
    (identifier)
    (intLiteral))
  (blockComment)
  (classProperty
    (identifier)
    (ERROR
      (identifier))
    (intLiteral))

but nested comments should be supported.

[bioball]

Closing this; we are removing support for nested block comments in Pkl 0.29