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Storage-dead boundary leaks demand into a previous local incarnation · case 02

Storage-dead boundary leaks demand into a previous local incarnation.

Member previewVariant 2 · 3 implementations · 13 checks per implementation

Case contract

Backward reference-demand transfer over a finite straight-line IR. ops execute forward and analysis traverses backward. use/return demand one reference; call demands all actual references. def and storage_dead kill a local. assign(d,s) propagates demand from destination to source, killing destination. reborrow(d,p) kills child demand and adds parent unconditionally because construction reads parent. phi(d,sources) propagates destination demand to every source. drop(ref,needs_drop) demands only when destructor can observe referent. branch supplies two already-computed successor demand sets, both unioned. Return sorted entry-demand names.

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
dead boundary	`["a"]`	`[]`	Failed

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