(bison.info) Declarations

 
 Bison Declarations
 ==================
 
    The "Bison declarations" section of a Bison grammar defines the
 symbols used in formulating the grammar and the data types of semantic
 values.   Symbols.
 
    All token type names (but not single-character literal tokens such as
 `'+'' and `'*'') must be declared.  Nonterminal symbols must be
 declared if you need to specify which data type to use for the semantic
 value ( More Than One Value Type Multiple Types.).
 
    The first rule in the file also specifies the start symbol, by
 default.  If you want some other symbol to be the start symbol, you
 must declare it explicitly ( Languages and Context-Free Grammars
 Language and Grammar.).

 
* Token Decl        Declaring terminal symbols.
* Precedence Decl   Declaring terminals with precedence and associativity.
* Union Decl        Declaring the set of all semantic value types.
* Type Decl         Declaring the choice of type for a nonterminal symbol.
* Expect Decl       Suppressing warnings about shift/reduce conflicts.
* Start Decl        Specifying the start symbol.
* Pure Decl         Requesting a reentrant parser.
* Decl Summary      Table of all Bison declarations.

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