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).
28 lines
1.0 KiB
Plaintext
28 lines
1.0 KiB
Plaintext
// `xx <pack>[i]` erased to a protocol-typed local.
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//
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// Erasing a single comptime-pack element to a protocol scalar routes through
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// buildProtocolErasure. A pack index is a comptime rvalue (a pack has no
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// runtime storage — `sources[i]` resolves to the call-site arg, which only
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// gets storage when lowered as a value), so the erasure must heap-copy the
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// materialized element rather than take its address.
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//
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// Regression (issue 0135): `xx sources[0]` used to lower the bare pack as a
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// value and error with "pack 'sources' has no runtime value".
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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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first :: (..sources: VL) -> i64 {
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x : VL(i64) = xx sources[0]; // erase element 0 to VL(i64)
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return x.get();
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}
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main :: () -> i32 {
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print("{}\n", first(IntCell.{ v = 7 })); // 7
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print("{}\n", first(IntCell.{ v = 42 }, IntCell.{ v = 99 })); // 42 (element 0)
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0
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}
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