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Error code: VFAV(5)

Error: convert mark is used for non-binary operator alias.
What to do: remove the convert mark or make sure that it is applied to
  a binary operator alias.

Class: BB [G -> CC rename f as g alias "[]" end]
Feature name: g
Line: 1
  ->class BB [G -> CC rename f as g alias "[]" convert end]
      

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