agra ce77867566 ffi any_to_string handles optionals — make-green ...

Closes the optional-through-Any gap that test 178 pinned.

Stdlib (`library/modules/std.sx`):
- New `optional_to_string :: (o: $T) -> string` returns `"null"`
  when the optional is None, otherwise recurses through
  `any_to_string` on the unwrapped inner value. Per-shape
  monomorphisation re-emits this for each concrete `?T`.
- `any_to_string` grows a `case optional:` arm that dispatches
  through `cast(type) val` (same shape as `case struct:` etc.).
  The cast picks up the dynamic optional type from the Any tag.

Compiler (`src/ir/lower.zig`):
- `resolveTypeCategoryTags` recognises "optional" as a dynamic
  category, scanning the TypeTable for `info == .optional`. The
  type-switch dispatch then routes any ?T tag into the optional
  arm.

IR snapshots regenerated where the optional addition shifted
constant pool / string numbering: 142, ffi-objc-call-06,
ffi-objc-dsl-07. 218/218 (test 178 included).

The variadic auto-unwrap in `packVariadicCallArgs` stays in
place — direct `print(opt)` calls still flow through it. The new
arm closes the gap for struct fields, slice elements, and any
other path that boxes an optional before stringifying.

2026-05-28 07:51:44 +03:00

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