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.
63 lines
2.9 KiB
Plaintext
63 lines
2.9 KiB
Plaintext
// Feature 1 / Step 0.4 — tuple baseline probe (gate for Decision 2:
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// "tuples are first-class for pack storage").
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//
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// This file is the audit artifact: it exercises every tuple operation the
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// canonical `Combined`/`map` body relies on, EXCEPT the two pack/tuple
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// projection+spread sugars that are themselves Feature 1 work (documented
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// as gaps at the bottom). Everything here RUNS today.
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//
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// Run: ./zig-out/bin/sx run examples/probes/tuple-baseline.sx
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#import "modules/std.sx";
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Listenable :: struct { value: i64; } // stand-in element struct
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Combined :: struct { sources: Tuple(i32, i32); } // tuple-typed field (Decision 2)
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swap :: (a: i64, b: i64) -> Tuple(i64, i64) { .(b, a) }
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fst :: (t: Tuple(i64, i64)) -> i64 { t.0 }
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main :: () -> i32 {
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// ── Block A — primitives (WORKS) ───────────────────────────────
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pair := .(40, 2); // inferred positional
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print("A.idx {} {}\n", pair.0, pair.1);
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named := .(x = 10, y = 20); // named + numeric access
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print("A.named {} {} {}\n", named.x, named.0, named.1);
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one := .(42); // 1-tuple
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print("A.one {}\n", one.0);
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a : i64 = pair.0; // element into typed local
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print("A.local {}\n", a);
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// ── Block B — storage in a struct field (WORKS; core of Decision 2)
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c : Combined = ---;
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c.sources = .(7, 9); // assign tuple value to field
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print("B.field {} {}\n", c.sources.0, c.sources.1);
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// ── Block C — return / pass / operators (WORKS) ────────────────
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s := swap(1, 2);
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print("C.ret {} {}\n", s.0, s.1);
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print("C.pass {}\n", fst(.(11, 22)));
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print("C.eq {}\n", .(1, 2) == .(1, 2));
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cc := .(1, 2) + .(3, 4);
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print("C.concat {} {}\n", cc.0, cc.3);
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print("C.mem {}\n", 3 in .(1, 2, 3));
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0
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}
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// ── GAPS (Feature 1 work — intentionally NOT exercised above) ──────
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//
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// G1. Tuple field projection across elements:
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// t := .(Listenable.{value=1}, Listenable.{value=2});
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// v := t.value; // expected: .(1, 2) — Decision 3 "tuple.field"
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// Today: `error: field 'value' not found on type 'tuple'`.
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// Needed by canonical `self.sources.value`.
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//
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// G2. Tuple spread into call args:
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// p := .(10, 20);
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// add(..p); // expected: add(10, 20) — Decision 3 "..tuple"
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// Today: lowers to one `undef` arg → LLVM arity verification failure.
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// Needed by canonical `mapper(..sources.value)` and `.(..sources)`.
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//
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// Both are already scheduled: parsing in Phase 1.2 (PackExpansion node covers
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// `.(..pack)` / `..pack.field`), sema in Phase 2.3 ("tuple-spread parallels").
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// No separate Feature 1.5 needed — see Step 0.4 triage in CHECKPOINT-LANG.md.
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