Typeless Nonterminal in Bison

Question

From what I can tell, a Bison declaration is in the form
%type <type> nonterminal

Is there a way to define a nonterminal without giving it a type?

Answer 1

%type doesn't actually define a non-terminal -- it sets the type of a non-terminal that is defined elsewhere. Some versions of bison give you a warning for a %type with an undefined non-terminal, but others just ignore it.

You define a non-terminal by giving a rule with the non-terminal on the left side (before the : ).