break/return does not become a LocalJumpError when it should

So it turns out that the test_local_jump_error test has been running, but not actually running. I discovered it when I made various fixes and improvements to non-local flow control that appear to have made it a hard failure:

Before:

~/NetBeansProjects/jruby ➔ jruby -X-C test/test_local_jump_error.rb 
Loaded suite test/test_local_jump_error
Started

Finished in 0.062 seconds.

0 tests, 0 assertions, 0 failures, 0 errors

After:

~/NetBeansProjects/jruby ➔ jruby -X-C test/test_local_jump_error.rb 
Loaded suite test/test_local_jump_error
Started
:1: break from proc-closure (LocalJumpError)

So it wasn't working before either. I'm going to disable the test, and I'm filing this bug.

The only way I can see to make this and other LJE cases work right would be to inspect the frame stack and see if the target frame/jumpTarget is still there, but since we preallocate frames and jump targets it would end up being wrong. Also look at this return case:

Not rescuable:

def foo
  bar(Proc.call {return})
end

def bar(proc)
  begin
    proc.call
  rescue LocalJumpError
    puts 'here'
  end
end

foo # no output

Rescuable:

def foo
  Proc.call {return}
end

def bar(proc)
  begin
    proc.call
  rescue LocalJumpError
    puts 'here'
  end
end

bar(foo) # output 'here'

So the return is rescuable only in the case where it has escaped from its original containing method. Damned frustrating.