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 7.44 `.equiv SYMBOL, EXPRESSION'
 ================================
 
 The `.equiv' directive is like `.equ' and `.set', except that the
 assembler will signal an error if SYMBOL is already defined.  Note a
 symbol which has been referenced but not actually defined is considered
 to be undefined.
 
    Except for the contents of the error message, this is roughly
 equivalent to
      .ifdef SYM
      .err
      .endif
      .equ SYM,VAL
    plus it protects the symbol from later redefinition.
 

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