FA-43054 / Borrow checking / Member archive

Only the first declared outlives constraint enters the solver · case 04

Only the first declared outlives constraint enters the solver.

Member previewVariant 4 · 3 implementations · 11 checks per implementation

Case contract

Solve finite outlives constraints a:b meaning a contains b. regions is universe, edges named constraints, equalities are bidirectional, demands maps region to points, universal maps region to required external points, forbidden maps region to points forbidden by storage scope. Compute least fixed point. Unknown edge endpoints produce error unknown; own seeds are retained; report sorted point sets and region names violating forbidden points. The static solution includes disconnected regions and propagates through cycles.

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
transitive reversed order	`[{"a": [], "b": [], "c": [4]}, []]`	`[{"a": [4], "b": [4], "c": [4]}, []]`	Failed

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