FA-43823 / Borrow checking / Member archive

Phi borrow origins are assigned to the wrong predecessor edge · case 03

Phi borrow origins are assigned to the wrong predecessor edge.

Member previewVariant 3 · 3 implementations · 21 checks per implementation

Case contract

Check dataflow certificates for loan analysis. Reachability starts at entry and ignores dead blocks; all normal and exceptional successors participate; loop header solution includes backedge loans; kill transfer is edge-specific; phi origins correspond to predecessor edge; dominator proof must cover every incoming edge; a loan definition cannot be live before its definition except on a proven loop backedge; unreachable kills do not invalidate reachable loans; terminal return kills only function-local loans. 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
phi-edge-origin regression 0	`[]`	`["phi-edge-origin"]`	Failed

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