ast: add continue expression

src/parser/expr.rs

@@ -120,6 +120,7 @@ fn from_prefix(token: &Token) -> PResult<(Ps, Prec)> {
         TKind::While => (Ps::Op(Op::While), Prec::Body),
         TKind::Break => (Ps::Op(Op::Break), Prec::Body),
         TKind::Return => (Ps::Op(Op::Return), Prec::Body),
+        TKind::Continue => (Ps::Op(Op::Continue), Prec::Min),
 
         TKind::LCurly => (Ps::Op(Op::Block), Prec::Min),
         TKind::RCurly => (Ps::End, Prec::Do),
@@ -266,6 +267,7 @@ impl<'t> Parse<'t> for Expr {
                     Some(value) => Expr::Op(Op::Group, vec![value]),
                     None => Expr::Op(Op::Tuple, vec![]),
                 },
+                Ps::Op(Op::Continue) => p.consume().then(Expr::Op(Op::Continue, vec![])),
                 Ps::Op(op @ (Op::If | Op::While)) => {
                     p.consume();
                     let exprs = vec![