[ruby/yarp] Disallow numbered parameters in multiple scopes

https://github.com/ruby/yarp/commit/5fd4d3b89a

1 files changed, 9 insertions, 2 deletions

diff --git a/test/yarp/errors_test.rb b/test/yarp/errors_test.rb
index 7003dceb38..89fafdf28d 100644
--- a/test/yarp/errors_test.rb
+++ b/test/yarp/errors_test.rb
@@ -1206,11 +1206,18 @@ module YARP
       ]
     end
 
+    def test_double_scope_numbered_parameters
+      source = "-> { _1 + -> { _2 } }"
+      errors = [["Numbered parameter is already used in outer scope", 15..17]]
+
+      assert_errors expression(source), source, errors, compare_ripper: false
+    end
+
     private
 
-    def assert_errors(expected, source, errors)
+    def assert_errors(expected, source, errors, compare_ripper: RUBY_ENGINE == "ruby")
       # Ripper behaves differently on JRuby/TruffleRuby, so only check this on CRuby
-      assert_nil Ripper.sexp_raw(source) if RUBY_ENGINE == "ruby"
+      assert_nil Ripper.sexp_raw(source) if compare_ripper
 
       result = YARP.parse(source)
       node = result.value.statements.body.last