bb6eca6b91
Next slice of the variadic heterogeneous type packs (`..$args`) feature: type-system representation. Per the FFI cadence rule, this commit locks in the parser-rejection behavior so the next commit's type-rep extension surfaces as a behavior shift. examples/154-pack-type-rep.sx uses `..$args` inside a `Closure(...)` type expression — the pack-shape spelling used by impl headers like `impl Into(Block) for Closure(..$args) -> $R`. Today's parser recognizes `..$args` only at the parameter-list site (1b); `parseTypeExpr`'s `Closure(...)` arm calls `parseTypeExpr` per position and hits "expected type name" at the `..` token. Snapshot captures the rejection at line 18, column 26. Next commit (1c.B): - Parser: `parseTypeExpr` Closure arm accepts `..$args` as the trailing pack marker. AST gets a `pack_name: ?[]const u8` (or equivalent) field on `ClosureTypeExpr`. - types.zig: `FunctionInfo` / `ClosureInfo` gain `pack_start: ?u32` so the pack shape is distinct from any concrete arity in the type table. Hash/eql updated. - type_bridge: `resolveClosureType` threads pack_start through. - 154 flips green. 192/192 example tests + `zig build test` green.
24 lines
876 B
Plaintext
24 lines
876 B
Plaintext
// Variadic heterogeneous type packs — `..$args` — type-system
|
|
// representation lock-in.
|
|
//
|
|
// Step 1c slice for the pack feature (see
|
|
// ~/.claude/plans/lets-see-options-for-merry-dijkstra.md). Exercises
|
|
// the parser's acceptance of `..$args` inside a `Closure(...)` type
|
|
// expression — the pack-shape spelling used by impl headers like
|
|
// `impl Into(Block) for Closure(..$args) -> $R`.
|
|
//
|
|
// Today's parser only accepts `..$args` in fn parameter lists (1b);
|
|
// the same syntax inside a `Closure(...)` type expression hits
|
|
// `expected type name` at the `..` token. This file pins that
|
|
// rejection. The next commit teaches `parseTypeExpr`'s `Closure(...)`
|
|
// arm + the type-table representation to carry the pack.
|
|
|
|
#import "modules/std.sx";
|
|
|
|
takes_cb :: (cb: Closure(..$args) -> $R) -> void { }
|
|
|
|
main :: () -> s32 {
|
|
print("pack type rep ok\n");
|
|
return 0;
|
|
}
|