test/backtrack2.lm


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# Token names.
lex start
{
	token id /[a-z]+/
	ignore ws /[ \t\n]+/
}

token bang1 /'!'/
token bang2 /'!'/

def one [bang1 id id id]

def two [bang2 id id id id]

def prods 
	[one]
|	[two]

def start
	[prods]

parse S: start( stdin )
print_xml( match S "!aa bb cc dd" )