87ee3d3e65
lowerTupleLiteral now coerces/erases each spliced spread element to the contextual target tuple field type (computed even when a spread is present, indexed by output position). New coerceOrErase: protocol target -> xx-erase via buildProtocolErasure, else coerceToType. So c.sources = (..sources) on a (..VL(Ts)) field erases each concrete pack element to its VL(Ti) slot. examples/210 (build(IntCell, StrCell) -> 10 hi). 245 examples + unit green.
29 lines
996 B
Plaintext
29 lines
996 B
Plaintext
// Phase 6 — `c.sources = (..sources)`: materialize a pack into a
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// protocol-typed tuple field, erasing each concrete pack element to the field's
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// protocol slot. The pack `..sources: VL` holds concrete cells; `(..sources)`
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// into a `(..VL(Ts))` field `xx`-erases each to its `VL(Ti)` value.
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#import "modules/std.sx";
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VL :: protocol(T: Type) { get :: () -> T; }
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IntCell :: struct { v: s64; }
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StrCell :: struct { s: string; }
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impl VL(s64) for IntCell { get :: (self: *IntCell) -> s64 => self.v; }
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impl VL(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
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Combined :: struct($R: Type, ..$Ts: []Type) {
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sources: (..VL(Ts));
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value: $R;
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}
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build :: (..sources: VL) -> void {
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c : Combined(s64, ..sources.T) = ---;
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c.sources = (..sources); // pack → tuple, per-element erase
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print("{} {}\n", c.sources.0.get(), c.sources.1.get());
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}
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main :: () -> s32 {
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build(IntCell.{ v = 10 }, StrCell.{ s = "hi" }); // 10 hi
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0;
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}
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