agra
ce3c2fe7bd
ffi M5.A.next.1d.A: pack impl matching — lock in concrete-only miss
...
Step 1d lock-in test pinning today's matching behaviour.
`registerParamImpl` records every impl in `param_impl_map` keyed
by `"Proto\x00<arg_mangled>\x00<src_mangled>"`. For a pack impl
`Into(Block) for Closure(..$args) -> $R` the key contains the
pack-shaped closure's mangle (interns with `pack_start = Some(0)`
after 1c.B). At the `xx cl : *Block` site the lookup mangles the
concrete `Closure(s32, bool) -> bool` source and finds nothing —
the existing focused diagnostic fires:
no `Into(Block) for cl_s32_bool__bool` impl — add a per-signature
`__block_invoke_<sig>` trampoline + Into impl alongside the
existing ones in modules/std/objc_block.sx, or declare it in
your own code
The pack impl is reachable in the file but never considered.
Next commit (1d.B):
- New `param_impl_pack_map` keyed by `"Proto\x00<arg_mangled>"`
(no src) — populated by `registerParamImpl` when the source
is pack-shaped.
- `tryUserConversion` walks the pack map on concrete-key miss.
Pack shape matches when the impl's fixed prefix equals the
source's matching prefix; the remainder binds to `$args` and
the source's return type binds to `$R`. Concrete impls win
over pack impls (specificity).
- `resolveTypeWithBindings` learns the closure_type_expr path
so the impl body's `self: Closure(..$args) -> $R` substitutes
to the concrete source closure during monomorphisation.
The `Closure(s32, bool) -> bool` shape is not covered by stdlib
or 96-block-multi-arg's hand-rolled impls, so the pack impl is
the only candidate post-1d.B.
193/193 example tests + `zig build test` green.
2026-05-27 12:50:23 +03:00
..
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