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Type-checking gaps (segfault/corruption → compile errors): - 0197: reject a store into an annotated slot whose value has no modeled coercion AND a different byte width (a 16-byte string into a 4-byte i32 overran the slot and segfaulted). New checkAssignable / noneReinterpretIsUnsafe (coerce.zig, width via the LLVM-accurate typeSizeBytes) wired into every store site: var/const-decl, single + multi assignment (identifier/field/index/ element/deref), named-return defaults. Same-width reinterpretations (*T→[*]T, i64→isize, fn-ref) and explicit xx/cast stay allowed; cascades suppressed via externalErrorsExist. Examples 1205, 1206. - 0198: an implicit `Any → T` unbox is now a compile error (it blindly reinterpreted the boxed payload — silent garbage for a wrong scalar, a segfault for an aggregate). xx and compiler-generated match/pack unboxes are unaffected. Example 1207. - 0199: `Any == <concrete>` (one operand Any) aborted the LLVM verifier — the comparison arm now fires when either operand is Any, boxing the concrete side first. Example 0654. Multi-return deferrals (PLAN-MULTIRET #6 + named-order + D3 + generic): - Reorder named return elements by name instead of requiring slot order; error on unknown/duplicate/missing (value-only AND full-failable-tuple forms). Examples 0210, 0214. - Reject a bare-paren (A, B) multi-return signature in generic-arg position (return-position-only). Example 0215. - Multi-return closure types / lambda literals work via the reused tuple machinery (destructure, single-bind+field, lambda arg). Example 0216. - Generic multi-return: positional works (0217); 0200: the named-slot implicit-return form now works for generic free fns + struct methods — monomorphizeFunction now calls bindNamedReturnSlots. Example 0218. readme.md documents the annotated-store coercion rule; CHECKPOINT-MULTIRET.md updated. Full corpus green (850/0).
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