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(bison.info)Type Decl

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Nonterminal Symbols
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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 (Note: The
Collection of Value Types.).  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>'.