Some programming languages permit you to
use words like if, which are normally reserved
as label or variable names, provided that such use does not
conflict with the legal use of these names in the programming language.
This is extremely hard to do in the framework of yacc.
It is difficult to pass the lexical analyzer information
telling it one instance of if is a keyword
and another instance is a variable.
The user can attempt to implement this using the
mechanism described in the last subsection, but this is not trivial.
It is better that the keywords be reserved,
that is, forbidden for use as variable names.
Examples of using yacc
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