FA-44050 / Borrow checking / Member archive

A move on one predecessor is absent from the possible-move state · case 05

A move on one predecessor is absent from the possible-move state.

Member previewVariant 5 · 3 implementations · 21 checks per implementation

Case contract

Check ownership lattice join certificates. Definitely initialized paths intersect predecessor sets; possibly moved paths union; unique capabilities survive only if same owner on all paths; returned paths excluded from continuing join; divergent predecessors contribute bottom; reference alternatives union origins; assignment on every path restores initialization; storage incarnations cannot merge by variable spelling; drop flags reflect possibly initialized fields; conditional ownership is not unconditional ownership. Input is a fully explicit descriptor of the stated toy IR. Return rule identifiers in declaration order; absent optional obligations use the provided neutral defaults. No rule is an assertion about a production language.

Why this case matters

A finite offline static-analysis model of ownership and borrowing; it does not execute the analyzed program.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
possible-move-union regression 0	`[]`	`["possible-move-union"]`	Failed

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