Treat unclosed comment as error

schala-lang/language/src/tokenizing.rs

@@ -156,7 +156,11 @@ pub fn tokenize(input: &str) -> Vec<Token> {
               break;
             }
           }
-          continue;
+          if comment_level != 0 {
+            Error("Unclosed comment".to_string())
+          } else {
+            continue;
+          }
         },
         _ => Slash
       },