pub struct FfiCtx<'a> {
    pub func_name: &'a str,
    pub vm_objs: &'a VMObjects,
    pub user_data: Option<usize>,
    pub stack: &'a mut Stack,
    pub gcc: &'a GcContainer,
    /* private fields */
}
Immutably borrows from an owned value. 
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Mutably borrows from an owned value. 
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Returns the argument unchanged.
Calls U::from(self).
That is, this conversion is whatever the implementation of
From<T> for U chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.