process.c: argument types over conversion

* process.c (rb_exec_getargs): honor the expected argument types
  over the conversion method.  the basic language functionality
  should be robust.  [ruby-core:75388] [Bug #12355]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54934 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 18 insertions, 0 deletions

diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index 8d6274adf3..28617b60b4 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -2256,4 +2256,22 @@ EOS
       system(bin, "--disable=gems", "-w", "-e", "puts ARGV", *args)
     end;
   end
+
+  def test_to_hash_on_arguments
+    all_assertions do |a|
+      %w[Array String].each do |type|
+        a.for(type) do
+          assert_separately(['-', EnvUtil.rubybin], <<~"END;")
+          class #{type}
+            def to_hash
+              raise "[Bug-12355]: #{type}#to_hash is called"
+            end
+          end
+          ex = ARGV[0]
+          assert_equal(true, system([ex, ex], "-e", ""))
+          END;
+        end
+      end
+    end
+  end
 end