code: public Rule primaryExpression() {
  		return FirstOf(
  				parenGrouping(),
  				group.literals.anyLiteral(),
  				unqualifiedThisOrSuperLiteral(),
  				arrayCreationExpression(),
  				unqualifiedConstructorInvocation(),
  				qualifiedClassOrThisOrSuperLiteral(),
  				identifierExpression());
  	}
docs: P0