Assertion: apostrophe's function | /r/CapableOf | evaluate the argument
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Source sentences:
text: Consider that if the symbol argument was not quoted, the getvar function would evaluate the argument to yield any value that has been assigned to the symbol in the active document namespace (e.g. via a setq or set expression); if the symbol holds no value (or indeed, holds a value other than a valid string or symbol argument), the getvar expression would consequently error with a 'bad argument type: (or stringp symbolp)' error.