FA-43773 / Borrow checking / Member archive

An empty split result grants permission to one element · case 03

An empty split result grants permission to one element.

Member previewVariant 3 · 3 implementations · 21 checks per implementation

Case contract

Validate static proof objects for splitting borrowed slices. Bounds are half-open; split point lies in 0..length; children exactly partition parent; exclusive children disjoint; every child retains parent owner and generation; dynamic indices need inequality proof; empty children confer no element access; strided loans include every enumerated element; reverse views retain original element addresses; consuming split removes parent exclusive capability. 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
empty-access regression 0	`[]`	`["empty-access"]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.