[antlr-interest] AST construction problem

[Damir Kirasić]

Hello,

I am new to ANTLR.
I am trying to construct an AST for C
with the following C grammar:

translation_unit
	scope Symbols;
	@init {
	  $Symbols::types = new Hashtable();
	}
	: external_declaration+ -> ^(translation_unit external_declaration+)
	;
	
	... // other rules
	
but I get 

"error(136): C.g:87:31: reference to rewrite element translation_unit
without reference on left of ->"

It works fine if I define translationUnit as a token
and then use rewrite rule:

-> ^(translationUnit external_declaration+)

Can I do that without defining translationUnit as a token
and use rule name translation_unit  instead?

Thank you for your answers.

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