6b0ebdd92b
Protocol method declarations now declare their receiver explicitly as the first parameter — 'self: *Self' (or 'self: Self') — matching the impl method signature, instead of the old implicit-receiver form where the listed params were only the extra args. That asymmetry repeatedly caused confusion over whether the first param was the receiver or an argument. The parser validates the first param is 'self' typed Self/*Self, then strips it, so all downstream lowering and the dispatch ABI are unchanged (impl blocks and call sites are unaffected). A protocol method missing the receiver is now a parse error. Migrated all 129 protocol method signatures across library + examples (+ one inline-sx test in sema.zig) to the explicit form. Updated specs.md + readme.md. New: examples/0418-protocols-explicit-receiver.sx (feature), examples/1190-diagnostics-protocol-missing-receiver.sx (negative/diagnostic).
31 lines
1.1 KiB
Plaintext
31 lines
1.1 KiB
Plaintext
// Feature 1 — method calls on a PARAMETERIZED protocol pack (the canonical
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// shape: `..xs: ValueListenable` where each element conforms with its own
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// type-arg). Calling the protocol method `get()` on `xs[i]` resolves to the
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// concrete element's impl, even though each element binds a different `T`.
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//
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// (Parameterised-protocol impl methods with a concrete source type are now
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// registered as `<Source>.<method>`, so UFCS — and thus `xs[i].get()` —
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// resolves them.)
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#import "modules/std.sx";
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Box :: protocol(T: Type) {
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get :: (self: *Self) -> T;
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}
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IntCell :: struct { v: i64; }
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StrCell :: struct { s: string; }
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impl Box(i64) for IntCell { get :: (self: *IntCell) -> i64 => self.v; }
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impl Box(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
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describe :: (..xs: Box) -> void {
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// xs[0] : Box(i64), xs[1] : Box(string) — different type-args per position.
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print("first={} second={}\n", xs[0].get(), xs[1].get());
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}
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main :: () -> i32 {
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describe(IntCell.{ v = 11 }, StrCell.{ s = "hi" });
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describe(StrCell.{ s = "x" }, IntCell.{ v = 99 });
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0
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}
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