PHP_ParserGenerator - bug in grammar or in the parser generator?

[Alucinado]

I'm trying to create a parser for a simple language with the lemon port to PHP, and it works, almost.The following grammar:\[code\]%name SP_%declare_class { class SpecParser }%token_prefix SP_%include_class { public $retvalue = 'http://stackoverflow.com/questions/2045757/<todo: error handling>'; public function singleKey($elem) { end($elem); return key($elem); }}%parse_accept { $this->retvalue = http://stackoverflow.com/questions/2045757/$this->_retvalue;}%right ASSIGN.start(A) ::= spec(B) . { A = B; }spec(A) ::= top_stmt(B) . { A = B; }top_stmt(A) ::= . { A=array('empty' => NULL); }top_stmt(A) ::= conditional(B) . { A = B;}top_stmt(A) ::= retval(B) . { A = B; }top_stmt(A) ::= assignment(B) . { A = array('assignment' => B); }top_stmt(A) ::= MOD STRING(B) top_stmt(C) . {C['rulename'] = B; A=B;}conditional(A) ::= IF stmt_list(B) . { A = array('condbreak' => array('stmt_list' => B)); }conditional(A) ::= IF stmt_list(B) stmt(C) . { A = array('condexec' => array('cond' => B,'exec' => C)); }retval(A) ::= access(B) . { A = array('access' => B); }retval(A) ::= invoke(B) . { A = array('invoke' => B); }assignment(A) ::= access(B) ASSIGN expr(C) . {A = array('lval' => B, 'rval' => C);}expr(A) ::= retval(B) . { A = array('retval' => B); }expr(A) ::= NOT retval(B) . { A = array('!retval' => B); }stmt(A) ::= expr(B) . { A = array('expr' => B); }stmt(A) ::= assignment(B) . { A = array('assignment' => B); }empty_stmt_list(A) ::= . {A = array();}empty_stmt_list(A) ::= stmt(B) . { A = array(B);}empty_stmt_list(A) ::= empty_stmt_list(B) COMMA stmt(C) . { B[] = C; A = B;}stmt_list(A) ::= stmt_list(B) COMMA stmt(C) . {B[] = C; A=B; }stmt_list(A) ::= stmt(B) . { A = array(B); }invoke(A) ::= access(B) LPAREN empty_stmt_list(C) RPAREN . { A = array('target' => B,'args' => C); }access(A) ::= VARIABLE(B) . { A = array('variable' => B); }\[/code\]should parse inputs like:[*]'if $cond1,!$cond2,$cond3() $var = $this($a(),$inst1 = $b())' [*]'$var'[*]'%rulename $var'While inputs like 1 and 2 work as expected, somehow, not understandable for me how, input 3 returns string(8) "rulename". I have no idea which reductions should take place for that to happen. Is it something wrong with the grammar, or shall I start debugging PHP_ParserGenerator itself?Thanks