IDL Problem Code 47 with alias args-first

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This problem occurs when argument definitions are found after keywords (optional parameters).

Here's an example of this error:

function myfunc, kw = kw, arg1
  ;                       ^^^^ args first
  compile_opt idl2
  return,1
end

Which can be fixed by reducing to a single statment:

function myfunc, arg1, kw = kw
  ;              ^^^^ OK!
  compile_opt idl2
  return,1
end