IDL Problem Code 45 with alias multiple-comp-opt

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This error occurs when there are more than one compile_opt statements in a routine or main level program.

Here's an example of this error:

function myfunc
  compile_opt idl2
  compile_opt hidden
  ; ^^^^^^^^^^^^^^^^ multiple compile opts
  return,1
end

Which can be fixed by reducing to a single statment:

function myfunc
  compile_opt idl2, hidden
  ; ^^^^^^^^^^^^^^^^ OK!
  return,1
end