This example, so far, was tracking the current token number, not the
current column number. This is not nice for an example...
* examples/java/Calc.y (PositionReader): New.
Use it.
* examples/java/Calc.test: Check the output.
AFAICT, autoboxing/unboxing was added in Java 5 (September 30, 2004).
I think we can afford to use it. It should help us merge some Java
tests with the main ones.
However, beware that != does not unbox: it compares the object
addresses.
* examples/java/Calc.y, tests/java.at: Simplify.
* examples/java/Calc.test, tests/java.at: Improve tests.
* examples/java/Calc.y: New, based on test 495: "Calculator
parse.error=verbose %locations".
* examples/java/Calc.test, examples/java/local.mk: New.
* configure.ac (ENABLE_JAVA): New.
* examples/test (prog): Be ready to run Java programs.
