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When you use %union
to specify multiple value types, you must
declare the value type of each nonterminal symbol for which values are
used. This is done with a %type
declaration, like this:
%type <type> nonterminal…
Here nonterminal is the name of a nonterminal symbol, and
type is the name given in the %union
to the alternative
that you want (see The Union Declaration). You
can give any number of nonterminal symbols in the same %type
declaration, if they have the same value type. Use spaces to separate
the symbol names.
You can also declare the value type of a terminal symbol. To do this,
use the same <type>
construction in a declaration for the
terminal symbol. All kinds of token declarations allow
<type>
.