[PRISM] Fix crash with empty ensure blocks

Fixes ruby/prism#2179.

1 files changed, 16 insertions, 0 deletions

diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index cd521e6766..bc9f0b3aba 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -962,6 +962,22 @@ module Prism
         end
         prism_test_ensure_node
       CODE
+
+      # Test empty ensure block
+      assert_prism_eval(<<~RUBY)
+        res = []
+
+        begin
+          begin
+            raise
+          ensure
+          end
+        rescue
+          res << "rescue"
+        end
+
+        res
+      RUBY
     end
 
     def test_NextNode