IDL Problem Code 27 with alias duplicate-struct

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Danger

If your structures have different properties and property types, then this will cause problems

This identifies user-defined structures that have more than one definition present.

Note that IDL is case insensitive when resolving structures and, once a structure is compiled/defined, it can no longer be changed.

Here is an example of problem code and how to fix it:

pro myclass__define
  ; ^^^^^ duplicate procedure

  !null = {MyStruct, property: 42}
  ;        ^^^^^^^^ duplicate structure
end

pro myotherclass__define
  ; ^^^^^ duplicate procedure

  !null = {MyStruct, property: 42}
  ;        ^^^^^^^^ duplicate structure
end

To fix, change the names of your structures:

pro myclass__define
  ; ^^^^^ duplicate procedure

  !null = {MyClass, property: 42}
end

pro myotherclass__define
  ; ^^^^^ duplicate procedure

  !null = {MyOtherClass, property: 42}
end