fix: parsing of open

crates/kind-parser/src/expr.rs

@@ -618,14 +618,17 @@ impl<'a> Parser<'a> {
         self.advance(); // 'open'
         let type_name = self.parse_upper_id()?;
         let var_name = self.parse_id()?;
-        let next = self.parse_expr(false)?;
-        let end = next.range;
 
         let motive = self.try_single(&|this| {
             this.eat_variant(Token::Colon)?;
             this.parse_expr(false)
         })?;
 
+        self.check_and_eat(Token::Semi);
+
+        let next = self.parse_expr(false)?;
+        let end = next.range;
+
         Ok(Box::new(Expr {
             data: ExprKind::Open { type_name, var_name, motive, next },
             range: start.mix(end),

crates/kind-tests/suite/checker/SimpleOpenWithMotive.golden

@@ -0,0 +1 @@
+Ok!

crates/kind-tests/suite/checker/SimpleOpenWithMotive.kind2

@@ -0,0 +1,14 @@
+#derive[match]
+record Pudim {
+    owo : U60
+    uwu : U60
+}
+
+#keep
+Ok (n: Pudim) : U60
+Ok n =
+    open Pudim n : _;
+    (+ n.owo n.uwu)
+
+Main : U60
+Main = Ok (Pudim.new 10 20)