| _library

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Usually, this symbol is not handled in a special way. However, if it does not exist at all, it is redirected to the entry point of the program. The effect is that constructs of the form

    .word _library-entry_point

resolve to 0 if the symbol is undefined.
Note: _library is also a control symbol, which means that under normal circumstances, references to it are not allowed. However, in Fargo II mode, programs and libraries have special permission to use this symbol.