6. Embedded QUEL for BASIC : Precompiling, Compiling, and Linking an EQUEL Program : Include File Processing : Including Source Code with Labels
 
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Including Source Code with Labels
Some EQUEL statements generate labels in the output code. If you include a file containing such statements, you must be careful to include the file only once in a given BASIC scope. Otherwise, you may find that the compiler later complains that the generated labels are defined more than once in that scope.
The statements that generate labels are the retrieve statement and all the EQUEL/FORMS block-type statements, such as display and unloadtable.