!nopar | {par} expr_par {-> expr_par.expr}
// !nopar to unambiguise 'foo[5].bar' between '(foo[5]).bar' and 'foo([5].bar),
!nobra!nopar | {range} obra no expr [n2]:no dotdot [n3]:no [expr2]:expr_nobra [n4]:no cbra annotations_o {-> New expr.crange(obra, expr, dotdot, expr2.expr, cbra, annotations_o.annotations)}
!nopar | {par} expr_par {-> expr_par.expr}
// !nopar to unambiguise 'foo[5].bar' between '(foo[5]).bar' and 'foo([5].bar),
!nobra!nopar | {range} obra no expr [n2]:no dotdot [n3]:no [expr2]:expr_nobra [n4]:no cbra annotations_o {-> New expr.crange(obra, expr, dotdot, expr2.expr, cbra, annotations_o.annotations)}