IDL Problem Code 30 with alias reserved-func

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Warning

Potentially fatal error depending on if the internal routine is written in PRO code or in core IDL/ENVI

This identifies when user-defined functions match the same name as routines internal to IDL.

Problem Example 1

function label_region
  ;      ^^^^^^^^^^^^ reserved function

  ; ... logic

  return, 1
end

To fix, change the name of your routine:

function my_label_region
  ;      ^^^^^^^^^^^^^^^ no name conflict

  ; ... logic

  return, 1
end