[ruby/yarp] Error when numbered parameters are written

https://github.com/ruby/yarp/commit/65b536ba12

1 files changed, 12 insertions, 0 deletions

diff --git a/test/yarp/errors_test.rb b/test/yarp/errors_test.rb
index 66a9bcd829..7003dceb38 100644
--- a/test/yarp/errors_test.rb
+++ b/test/yarp/errors_test.rb
@@ -1194,6 +1194,18 @@ module YARP
       ]
     end
 
+    def test_writing_numbered_parameter
+      assert_errors expression("-> { _1 = 0 }"), "-> { _1 = 0 }", [
+        ["Token reserved for a numbered parameter", 5..7]
+      ]
+    end
+
+    def test_targeting_numbered_parameter
+      assert_errors expression("-> { _1, = 0 }"), "-> { _1, = 0 }", [
+        ["Token reserved for a numbered parameter", 5..7]
+      ]
+    end
+
     private
 
     def assert_errors(expected, source, errors)