scriptc

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Malte UblandClaude Opus 5.5 ac31a15a62 Hold locals and module globals whose declared type does not compile as checked dynamic slots

Stage L1 of the localized-failure design.

A local, loop variable or module global whose declared TypeScript type has
no static lowering used to reject its declaration statement, and every
later use of the binding failed with it. Where that failure is about to
enter the build (the statement's poison in a TypeScript file, or the
module global's registration), the failing type now joins the lowerer's
degraded types and the unit lowers again: the type maps to the checked
dynamic wherever its strict mapping fails, so the slot holds values by
reference (typed capsules, live records and arrays, function thunks) and
typed reads out of it are checked. Each such slot is an SC6104
performance warning, listed under coverage's statement counts and in the
JSON envelope; coverage --fail-on=dynamic-slots fails on them, and
--tier=static-only keeps today's refusals.

A program that compiles today reaches neither commit point, so nothing
degrades and its output is unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-25 18:35:38 -07:00

corpus

Hold locals and module globals whose declared type does not compile as checked dynamic slots

2026-10-25 18:35:38 -07:00

coverage-fixtures

Keep the localized-failure fixture's field failing after interface any parameters map

2026-10-25 18:25:27 -07:00

deadstrip

…

diagnostics

Merge main

2026-10-25 10:55:32 -05:00