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LDC-E1107 — StableId claimed by two packages

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# LDC-E1107 — StableId claimed by two packages

## What it means

Not triggerable in a hermetic recipe.

Two declarations cannot share one StableId: when the world link takes nodes package by package, the first package keeps a contested id and the second gets this diagnostic while its node stays out of the world (`claim_node` in `link_world_take`). Reaching it needs two package IRs defining the same node id inside one linked world — a layout the single-file check never assembles. If you meet the code in real output, read it as "two packages define one id" and rename or re-home one declaration.