Method source_mut

crates/core/src/error/error.rs:1720–1731

(&mut self)

    }

    fn source_mut(&mut self) -> Option<&mut Error> {
        match self.unpack_mut() {
            OomOrDynErrorMut::DynError(e) => {
                // Safety: invariant of this type.
                let vtable = unsafe { e.as_ref().vtable };
                // Safety: using the vtable associated with this pointer's
                // concrete type and the pointer is valid.
                unsafe { (vtable.source_mut)(e.raw_copy()) }
            }
            OomOrDynErrorMut::Oom(_) => None,
        }
    }

    fn is<E>(&self) -> bool
    where