[antlr-interest] rule is ambiguous (tree grammar)

[jeroen.v.schagen at gmail.com]

The below parser grammar works, however when copying the rewrite rules into  
my tree grammar (as stated in the book). I seem to get the following error:  
reference $markupChain is ambiguous; rule markupChain is enclosing rule and  
referenced in the production (assuming enclosing rule). Anybody knows a  
solution that will fix my tree grammar?

Thanks in advance,
Jeroen


Parser grammar

markupChain: markup markupChain
-> ^( MARKUP_CHAIN markup markupChain )
| expression ';'
-> ^( MARKUP_CHAIN expression ';' )
| statement
-> ^( MARKUP_CHAIN statement )
| embedding ';'
-> ^( MARKUP_CHAIN embedding ';' )
| ';'
-> ^( MARKUP_CHAIN ';' ) ;

Tree grammar

markupChain: ^( MARKUP_CHAIN markup markupChain )
| ^( MARKUP_CHAIN expression ';' )
| ^( MARKUP_CHAIN statement )
| ^( MARKUP_CHAIN embedding ';' )
| ^( MARKUP_CHAIN ';' ) ;

URL:  
http://code.google.com/p/waebric/source/browse/trunk/implementations/java/antlr/src/main/grammar/
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