66bdc70bf1
Move examples/*.sx and their expected/ snapshots into per-category subfolders (examples/<category>/...). Folder = leading filename token, with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus runner and LSP sweep now discover each category's expected/ dir, while issues/ stays flat. Example 1058's repo-root-relative companion import is made file-relative. Path strings embedded in 164 snapshots were regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
// Variadic heterogeneous type packs — `..$args` — impl matching
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// lock-in.
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//
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// Step 1d slice for the pack feature (see
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// ~/.claude/plans/lets-see-options-for-merry-dijkstra.md). Pins
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// today's concrete-only impl-matching behaviour: a user-declared
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// `impl Into(Block) for Closure(..$args) -> $R` does NOT match
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// any concrete closure source type. The xx cast site hits the
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// existing "no `Into(Block) for <src>` impl" diagnostic even
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// though the pack impl is reachable.
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//
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// Next commit (1d.B) teaches `tryUserConversion` /
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// `registerParamImpl` to walk a second `param_impl_pack_map`
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// when the concrete-key miss happens. Pack impls bind their
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// `$args` and `$R` to the concrete source closure's tail types
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// and return; monomorphisation proceeds against those bindings.
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//
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// The `Closure(i32, bool) -> bool` shape is not covered by
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// stdlib's hand-rolled impls (only `Closure() -> void` and
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// `Closure(bool) -> void`) and not covered by 96-block-multi-arg's
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// `Closure(i32, *void) -> void` impl, so the pack impl is the
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// only candidate.
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#import "modules/std.sx";
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#import "modules/ffi/objc_block.sx";
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impl Into(Block) for Closure(..$args) -> $R {
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convert :: (self: Closure(..$args) -> $R) -> Block {
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.{
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isa = @_NSConcreteStackBlock,
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flags = 0,
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reserved = 0,
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invoke = null,
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descriptor = xx @__sx_block_descriptor,
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sx_env = self.env,
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sx_fn = self.fn_ptr,
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}
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}
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}
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main :: () -> i32 {
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cl := (a: i32, b: bool) => true;
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b : *Block = xx cl;
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print("pack impl match ok\n");
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return 0;
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}
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