40b5fb5f7e
Rewrite specs.md tuple/failable/pack/UFCS/grammar sections to the new syntax, update readme.md, and refresh stale tuple references in example header comments. Also fixes two pre-existing doc inaccuracies surfaced in review: drop the value-discarding `;` in the tuple-return examples, and correct the §13 function-type grammar production (optional param list + optional trailing `!` channel). Optional semantics unchanged. current/CHECKPOINT-LANG.md logs the cutover.
25 lines
1.1 KiB
Plaintext
25 lines
1.1 KiB
Plaintext
// Feature 1 / Step 1.2 — pack-expansion forms PARSE in all four positions.
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//
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// Parse-only probe. Spread reuses the existing `spread_expr` node (its operand
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// carries projection `xs.field` / type-application `F(Ts)`); closure-sig packs
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// use `ClosureTypeExpr.pack_name` + the new `pack_projection`. Sema/lowering
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// arrive in Phase 2 — do NOT expect this to compile/run yet. The authoritative
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// checks are the parser unit tests in src/parser.zig ("parse pack expansion: …").
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// 1. Tuple value position — `.(..pack)` / `.(..pack.field)`:
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tv1 :: () => .(..xs);
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tv2 :: () => .(..xs.value);
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tv3 :: () => .(a, ..xs, b); // mixed positional + spread
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// 2. Tuple type position — `Tuple(..F(Ts))` / `Tuple(..F(Ts.Arg))`:
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tt1 :: (x: Tuple(..ValueListenable(Ts))) => x;
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tt2 :: (x: Tuple(..ValueListenable(Ts.Arg))) => x;
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// 3. Call-arg position — `..pack` / `..pack.field` (reuses spread_expr):
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ca1 :: () => f(..xs);
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ca2 :: () => f(..xs.value);
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// 4. Closure-sig position — `Closure(..Ts)` / `Closure(..Ts.Arg)`:
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cs1 :: (cb: Closure(..Ts) -> i32) => cb;
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cs2 :: (cb: Closure(..sources.T) -> i32) => cb;
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