singleton: fix missing *this return value in operator=
while there, disable both operator= and copy ctor, since they are not supposed to be around for a singleton
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@ -50,8 +50,8 @@ namespace Language
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class Singleton
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{
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Singleton() {}
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Singleton(Singleton &s) {}
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Singleton& operator=(const Singleton&) {}
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Singleton(Singleton &s) = delete;
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Singleton& operator=(const Singleton&) = delete;
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public:
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static T* instance()
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{
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