FA-44255 / Borrow checking / Member archive

Shared-borrow proof is reused to authorize an exclusive borrow · case 05

Shared-borrow proof is reused to authorize an exclusive borrow.

Member previewVariant 5 · 3 implementations · 21 checks per implementation

Case contract

Validate reuse of static borrow proof certificates. Cache entry belongs to same IR revision, same normalized place, same mutability, same lifetime substitution, same solver universe, same CFG edge kind and same target layout; negative results are invalidated when new outlives facts arrive; incomplete fixed-point results are never reusable; diagnostic reuse rebinds source spans to current lifetime occurrence mapping. 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
permission-key regression 0	`[]`	`["permission-key"]`	Failed

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