Macro gen_tuple_value

macro_rules! gen_tuple_value {
    ($self:ident; $($all:ident),* ) => { ... };
    (@ $self:ident; ($($state:expr),*);) => { ... };
    (@ $self:ident; ($($state:expr),*); $last:ident $(,$not_last:ident)* ) => { ... };
}

Generates the into_tuple value corresponding to the given type names:

gen_tuple_value(self; A, B, C)
=> (self.inner.inner.value, self.inner.value, self.value)