~temp scene = 0

->Start(scene)

===Start(ref scene)
~scene++
SCENE {scene}
-> END

Stack overflow.
   at System.String.GetNonRandomizedHashCode()
   at System.Collections.Generic.NonRandomizedStringEqualityComparer+OrdinalComparer.GetHashCode(System.String)
   at System.Collections.Generic.Dictionary`2[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].FindValue(System.__Canon)
   at System.Collections.Generic.Dictionary`2[[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].TryGetValue(System.__Canon, System.__Canon ByRef)
   at Ink.Runtime.CallStack.GetTemporaryVariableWithName(System.String, Int32)
   at Ink.Runtime.VariablesState.GetRawVariableWithName(System.String, Int32)
   at Ink.Runtime.VariablesState.GetVariableWithName(System.String, Int32)
   at Ink.Runtime.VariablesState.ValueAtVariablePointer(Ink.Runtime.VariablePointerValue)
   at Ink.Runtime.VariablesState.GetVariableWithName(System.String, Int32)
   at Ink.Runtime.VariablesState.ValueAtVariablePointer(Ink.Runtime.VariablePointerValue)