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-rw-r--r--test/ruby/test_compile_prism.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/ruby/test_compile_prism.rb b/test/ruby/test_compile_prism.rb
index f2962dc3c7..3cad58a184 100644
--- a/test/ruby/test_compile_prism.rb
+++ b/test/ruby/test_compile_prism.rb
@@ -110,6 +110,7 @@ module Prism
assert_prism_eval("defined? -> { 1 + 1 }")
assert_prism_eval("defined? a && b")
assert_prism_eval("defined? a || b")
+ assert_prism_eval("defined? __ENCODING__")
assert_prism_eval("defined? %[1,2,3]")
assert_prism_eval("defined? %q[1,2,3]")