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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.
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