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).
26 lines
974 B
Plaintext
26 lines
974 B
Plaintext
// Erase two DISTINCT comptime-pack elements to protocol locals — each gets
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// its own heap copy and resolves to its OWN concrete type's method (IntCell.get
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// vs Doubler.get), proving the per-element erasure picks the right vtable.
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//
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// Regression (issue 0135): single-element `xx pack[i]` erasure to a protocol
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// scalar was unsupported (the bare pack lowered as a value and errored).
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#import "modules/std.sx";
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VL :: protocol(T: Type) { get :: (self: *Self) -> T; }
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IntCell :: struct { v: i64; }
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impl VL(i64) for IntCell { get :: (self: *IntCell) -> i64 => self.v; }
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Doubler :: struct { n: i64; }
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impl VL(i64) for Doubler { get :: (self: *Doubler) -> i64 => self.n * 2; }
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sum_two :: (..sources: VL) -> i64 {
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a : VL(i64) = xx sources[0]; // erase element 0
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b : VL(i64) = xx sources[1]; // erase element 1
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return a.get() + b.get();
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}
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main :: () -> i32 {
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print("{}\n", sum_two(IntCell.{ v = 10 }, Doubler.{ n = 16 })); // 10 + (16*2) = 42
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0
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}
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