[Bug-apl] ⎕ES wrong message

[Blake McBride]

      )CLEAR
CLEAR WS
      ∇test x
[1] x←'xx'
[2] ⎕ES 'SOME ERROR'
[3] ∇
      test '55'
SOME ERROR
      test 'xx'
      ^       ^


⎕ES is showing the modified and not the original argument passed to the
function.  IBM APL 2 displays the original argument passed.

Thanks.

Blake