as: Symbol Attributes

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1 5.5 Symbol Attributes
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1 Every symbol has, as well as its name, the attributes "Value" and
1 "Type".  Depending on output format, symbols can also have auxiliary
1 attributes.
1 
1    If you use a symbol without defining it, 'as' assumes zero for all
1 these attributes, and probably won't warn you.  This makes the symbol an
1 externally defined symbol, which is generally what you would want.
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