[PRISM] Fix crash in compile_prism

If the argument is not a file or a string, it assumes it's a string
which will crash because RSTRING_PTR and RSTRING_LEN assumes it's a
string.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/ruby/test_iseq.rb b/test/ruby/test_iseq.rb
index dd81610b53..35bf36e492 100644
--- a/test/ruby/test_iseq.rb
+++ b/test/ruby/test_iseq.rb
@@ -809,4 +809,10 @@ class TestISeq < Test::Unit::TestCase
       end
     end
   end
+
+  def test_compile_prism_with_invalid_object_type
+    assert_raise(TypeError) do
+      RubyVM::InstructionSequence.compile_prism(Object.new)
+    end
+  end
 end