KITFORMA · EDITORIAL GUIDE
Why can Vec::push be rejected while I hold a reference to one element?
KitForma editorial guide. Push may need to move vector storage. A previously borrowed element must not remain usable through an invalid address after that mutation.
Step-by-step guidance
Push may need to move vector storage. A previously borrowed element must not remain usable through an invalid address after that mutation.
Read or copy the needed value before pushing, or retain an index and borrow again afterward when the algorithm preserves index meaning. Do not assume spare capacity lets safe Rust ignore the mutable borrowing contract. If stable identity is necessary, design ownership around that requirement.
Test growth and no-growth cases in the refactored algorithm, including insertion or removal that changes positions. Reserving capacity addresses allocation behavior, not every aliasing rule. Unsafe pointer code would need a complete separate proof and is not the default repair.
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