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Foo foo(Foo) a = Foo ::Foo ::Foo::Bar::Baz Foo::Bar::Baz Foo::Bar::Baz Foo:: # a Bar::Baz:: # b Qux # c self.class::Foo a.b(1, 2)[3]::C::D self self.foo # foo $' $& $1 $99999 __LINE__ __FILE__ __ENCODING__