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Malte UblandClaude Opus 5.5
d74cc3b8bd
Stage L0 of the localized-failure design, report-only: no lowering changes. A type with no static lowering poisons the slot that holds it, and the poison rejects the declaration around it (a class, a signature, a declaration statement); each later use then fails on its own line. This records, on the committed diagnostics, where each type failure sits, whether a checked dynamic slot would keep the program's meaning, and which rejected declarations each failing statement used. coverage --explain-dynamic turns that into the would-be dynamic slot list with the cascade each slot clears, and the counts of errors that would disappear through stages L2 and L4. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>