443     pub ast: Ast,
469 pub enum Ast {  enum
493 impl Ast {  implementation
497             Ast::Empty(ref span) => span,  in span()
498             Ast::Flags(ref x) => &x.span,  in span()
499             Ast::Literal(ref x) => &x.span,  in span()
500             Ast::Dot(ref span) => span,  in span()
501             Ast::Assertion(ref x) => &x.span,  in span()
502             Ast::Class(ref x) => x.span(),  in span()
503             Ast::Repetition(ref x) => &x.span,  in span()
504             Ast::Group(ref x) => &x.span,  in span()
505             Ast::Alternation(ref x) => &x.span,  in span()
506             Ast::Concat(ref x) => &x.span,  in span()
513             Ast::Empty(_) => true,  in is_empty()
522             Ast::Empty(_)  in has_subexprs()
523             | Ast::Flags(_)  in has_subexprs()
524             | Ast::Literal(_)  in has_subexprs()
525             | Ast::Dot(_)  in has_subexprs()
526             | Ast::Assertion(_) => false,  in has_subexprs()
527             Ast::Class(_)  in has_subexprs()
528             | Ast::Repetition(_)  in has_subexprs()
529             | Ast::Group(_)  in has_subexprs()
530             | Ast::Alternation(_)  in has_subexprs()
531             | Ast::Concat(_) => true,  in has_subexprs()
544 impl fmt::Display for Ast {  implementation
557     pub asts: Vec<Ast>,
566     pub fn into_ast(mut self) -> Ast {  in into_ast()  argument
568             0 => Ast::Empty(self.span),  in into_ast()
570             _ => Ast::Alternation(self),  in into_ast()
581     pub asts: Vec<Ast>,
590     pub fn into_ast(mut self) -> Ast {  in into_ast()  argument
592             0 => Ast::Empty(self.span),  in into_ast()
594             _ => Ast::Concat(self),  in into_ast()
1127     pub ast: Box<Ast>,
1190     pub ast: Box<Ast>,
1359 impl Drop for Ast {  implementation
1364             Ast::Empty(_)  in drop()
1365             | Ast::Flags(_)  in drop()
1366             | Ast::Literal(_)  in drop()
1367             | Ast::Dot(_)  in drop()
1368             | Ast::Assertion(_)  in drop()
1370             | Ast::Class(_) => return,  in drop()
1371             Ast::Repetition(ref x) if !x.ast.has_subexprs() => return,  in drop()
1372             Ast::Group(ref x) if !x.ast.has_subexprs() => return,  in drop()
1373             Ast::Alternation(ref x) if x.asts.is_empty() => return,  in drop()
1374             Ast::Concat(ref x) if x.asts.is_empty() => return,  in drop()
1379         let empty_ast = || Ast::Empty(empty_span());  in drop()
1383                 Ast::Empty(_)  in drop()
1384                 | Ast::Flags(_)  in drop()
1385                 | Ast::Literal(_)  in drop()
1386                 | Ast::Dot(_)  in drop()
1387                 | Ast::Assertion(_)  in drop()
1389                 | Ast::Class(_) => {}  in drop()
1390                 Ast::Repetition(ref mut x) => {  in drop()
1393                 Ast::Group(ref mut x) => {  in drop()
1396                 Ast::Alternation(ref mut x) => {  in drop()
1399                 Ast::Concat(ref mut x) => {  in drop()
1482             let mut ast = Ast::Empty(span());  in no_stack_overflow_on_drop()
1484                 ast = Ast::Group(Group {  in no_stack_overflow_on_drop()