JavaParsers can't fold constants in static final fields to a ConstantType

[hrhino]

Apropos of scala/scala#5892:

Timed.java:

package a;
public @interface Timed {
  public static final long ONE_DAY = 1000 * 60 * 60 * 24;
  /* millis */
  long value();
}

Test.scala:

package a

@Timed(value = Timed.ONE_DAY)
object Main

yields:

[error] /Users/hhoughton/temp/Test.scala:3: annotation argument needs to be a constant; found: Timed.ONE_DAY
[error] @Timed(value = Timed.ONE_DAY)
[error]                      ^

If Timed.java is compiled first, this works fine.

This is because varDecl in JavaParsers only gives a static final constant a ConstantTyped tree if its rhs is a literal. To fix this, tryLiteral will need swapped out for something a bit more sophisticated (plausibly ConditionalExpression in the java grammar).

I've got work done on this already; filing this ticket so I can justify PRing it separately from the linked annotation pr.