12e2ff7ef4
The compiler concept is declare/define (comptime type construction); the old "reify" framing is gone from the entire repo. - Rename: PLAN-REIFY → PLAN-METATYPE, CHECKPOINT-REIFY → CHECKPOINT-METATYPE, PLAN-POST-REIFY → PLAN-POST-METATYPE (both rewritten around declare/define); examples 0614/0615/0617 → comptime-metatype-* (+ their expected/ triplets), headers rewritten. - Scrub reify from design/execution-evolution-roadmap.md (§7 step 3 contracts, §8.1, §9 decisions, §10 gates) → declare/define / comptime type construction. - core.sx prelude pointer + parser.test.zig surface lock updated to the declare/define builtins (define(handle, info) -> Type; EnumInfo.name). No behavior change; renamed examples match their renamed snapshots. Full suite green (673), all unit tests pass. Zero `reify` tokens remain in src/docs/sx/examples.
35 lines
1.2 KiB
Plaintext
35 lines
1.2 KiB
Plaintext
// Comptime type construction — identity: a type-fn that builds a type with
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// `define(declare(), ...)` must memoize by the instantiation's mangled name, so
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// `Box(i64)` resolved at two INDEPENDENT sites (here: a return type and a
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// parameter type) is ONE `TypeId`. A value built at one site is therefore
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// assignable / matchable at the other — nominal identity. If the minted result
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// were not registered under the mangled instantiation name, the two sites would
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// mint distinct types and `consume(build())` would be a type error.
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#import "modules/std.sx";
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#import "modules/std/meta.sx";
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Box :: ($T: Type) -> Type {
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return define(declare(), .enum(.{ name = "Box", variants = .[
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EnumVariant.{ name = "some", payload = T },
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EnumVariant.{ name = "none", payload = void },
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] }));
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}
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build :: () -> Box(i64) { // site A resolves Box(i64)
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return Box(i64).some(7);
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}
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consume :: (b: Box(i64)) { // site B resolves Box(i64) independently
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if b == {
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case .some: (n) { print("some {}\n", n); }
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case .none: { print("none\n"); }
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}
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}
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main :: () -> i32 {
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consume(build()); // typechecks ONLY if site A == site B
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b : Box(i64) = .none;
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consume(b);
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return 0;
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}
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